CN109088070A - Lithium ion battery and preparation method thereof - Google Patents

Lithium ion battery and preparation method thereof Download PDF

Info

Publication number
CN109088070A
CN109088070A CN201810790776.6A CN201810790776A CN109088070A CN 109088070 A CN109088070 A CN 109088070A CN 201810790776 A CN201810790776 A CN 201810790776A CN 109088070 A CN109088070 A CN 109088070A
Authority
CN
China
Prior art keywords
copper
lithium ion
ion battery
plastic
negative electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810790776.6A
Other languages
Chinese (zh)
Other versions
CN109088070B (en
Inventor
高回春
张誉
阮乐祥
宫宝昌
袁中直
刘金成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eve Energy Co Ltd
Original Assignee
Eve Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eve Energy Co Ltd filed Critical Eve Energy Co Ltd
Priority to CN201810790776.6A priority Critical patent/CN109088070B/en
Publication of CN109088070A publication Critical patent/CN109088070A/en
Application granted granted Critical
Publication of CN109088070B publication Critical patent/CN109088070B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • H01M4/74—Meshes or woven material; Expanded metal
    • H01M4/747—Woven material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

A kind of preparation method of lithium ion battery, by the way that soft copper wire and the first polymer filament are woven into copper plastic composite net cloth, copper metal is deposited on copper plastic composite net cloth using physical gas-phase deposition and obtains composite copper foil, negative electrode slurry is coated on composite copper foil and obtains negative electrode tab；Soft aluminium wire and the second polymer filament are woven into plastic-aluminum combined screen cloth, aluminum metal is deposited on plastic-aluminum combined screen cloth using physical gas-phase deposition and obtains clad aluminum foil, anode sizing agent is coated on clad aluminum foil and obtains positive plate；It is wound negative electrode tab, insulation diaphragm and positive plate to obtain battery core again, lithium ion battery is obtained after battery core is entered shell, fluid injection, chemical conversion and partial volume operation, obtained capacity of lithium ion battery is bigger, efficiency for charge-discharge is higher, and cyclical stability is more preferable, especially weight is lighter, and the more existing lithium ion battery of energy density greatly improves.

Description

Lithium ion battery and preparation method thereof
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of lithium ion battery and preparation method thereof.
Background technique
It by lithium metal or lithium alloy is negative electrode material, using the battery of non-aqueous electrolytic solution that lithium ion battery, which is a kind of,. Lithium ion battery is high with energy density, operating voltage is high, have extended cycle life, self discharge is low, memory-less effect, has a safety feature The advantages that, be widely used to the power supply of mobile phone, computer, video camera, camera etc., and electric vehicle engineering, The fields such as energy-storage battery, ups power, the Medical Instruments power supply of big power station play a significant role.With consumer electronics It becomes increasingly prosperous, market is swift and violent to the demand growth of lithium ion battery, while higher and higher to the performance requirement of lithium ion battery.Energy Metric density refers to the size that energy is stored in certain space or quality substance, and battery energy density refers to the average list of battery The electric energy that position volume or quality are released, battery energy density=battery capacity × discharge platform/battery weight.
The substrate that cathode uses in lithium ion battery at present is copper foil, which formed by the way of plating or extruding , with a thickness of 6um~12um, surface density 54g/m2~108g/m2, proportion is only in lithium ion battery for the weight of copper foil Inferior to positive and negative anodes powder, about 6%~20%.The substrate that anode uses is aluminium foil, which formed using pressure rolling mode , with a thickness of 10um~16um, surface density 27g/m2~43.2g/m2, the weight of aluminium foil proportion in lithium ion battery About 5%~10%, especially in large-sized power battery, weight is very big.
No matter in digital or power battery field, copper foil and aluminium foil auxiliary material is belonged in entire lithium ion battery, work With mainly conduction electronics.But pursue today of energy density in height, weight shared by copper foil and aluminium foil for improve lithium from It is a great obstacle for the energy density of sub- battery.It is to improve lithium ion battery energy by reducing the weight of auxiliary material One general orientation of density.
Summary of the invention
The purpose of the present invention is overcoming shortcoming in the prior art, a kind of lithium ion battery and its preparation side are provided Method, it is higher to be prepared energy density, and the better lithium ion battery of cyclical stability.
The purpose of the present invention is achieved through the following technical solutions:
The preparation method of lithium ion battery, comprising the following steps:
Soft copper wire and the first polymer filament are provided；
The soft copper wire and first polymer filament are woven into copper plastic composite net cloth, using copper metal as target The copper metal is deposited on the copper using physical gas-phase deposition and moulded again by material using the copper plastic composite net cloth as substrate It closes on screen cloth, obtains composite copper foil；
Negative electrode slurry is coated on the composite copper foil, is dried, is cold-pressed, slitting and sectioning obtain cathode Piece；
Soft aluminium wire and the second polymer filament are provided；
The soft aluminium wire and second polymer filament are woven into plastic-aluminum combined screen cloth, using aluminum metal as target The aluminum metal is deposited on the plastic-aluminum using physical gas-phase deposition and answered by material using the plastic-aluminum combined screen cloth as substrate It closes on screen cloth, obtains clad aluminum foil；
Anode sizing agent is coated on the clad aluminum foil, is dried, is cold-pressed, slitting and sectioning obtain anode Piece；
The negative electrode tab, insulation diaphragm and the positive plate are wound operation, obtain battery core；
The battery core is placed in shell, electrolyte is injected, then carries out chemical conversion and partial volume operation, obtains lithium ion battery.
In one of the embodiments, first polymer filament be pet fiber silk, Fypro silk, polyimide fiber silk, polyvinylidene fluoride silk or aramid fiber silk.
The mode of the braiding of the copper plastic composite net cloth uses plain weave mode in one of the embodiments,.
In one of the embodiments, in the plain weave mode of the copper plastic composite net cloth, diameter silk is first high Molecular fiber silk, tram are that more soft copper wires and more first polymer filaments alternate setting.
The weaving manner of the plastic-aluminum combined screen cloth uses plain weave mode in one of the embodiments,.
In one of the embodiments, in the plain weave mode of the plastic-aluminum combined screen cloth, diameter silk is the second high score Subbundle silk, tram are that more soft aluminium wires and more second polymer filaments alternate setting.
The length direction of the negative electrode tab is identical as the soft length direction of copper wire in one of the embodiments,.
The length direction of the positive plate is identical as the soft length direction of aluminium wire in one of the embodiments,.
The length direction of the length direction of the insulation diaphragm and the negative electrode tab and described in one of the embodiments, The length direction of positive plate is identical.
A kind of lithium ion battery is prepared using the preparation method of above-mentioned lithium ion battery.
The preparation method of above-mentioned lithium ion battery, it is multiple by the way that soft copper wire and the first polymer filament are woven into copper modeling Screen cloth is closed, copper metal is deposited on copper plastic composite net cloth using physical gas-phase deposition and obtains composite copper foil, cathode is starched Material, which is coated on composite copper foil, obtains negative electrode tab；Soft aluminium wire and the second polymer filament are woven into plastic-aluminum combined screen cloth, Aluminum metal is deposited on plastic-aluminum combined screen cloth using physical gas-phase deposition and obtains clad aluminum foil, anode sizing agent is coated on Positive plate is obtained on clad aluminum foil；It is wound negative electrode tab, insulation diaphragm and positive plate to obtain battery core again, battery core is entered Lithium ion battery is obtained after shell, fluid injection, chemical conversion and partial volume operation, obtained capacity of lithium ion battery is bigger, efficiency for charge-discharge It is higher, and cyclical stability is more preferable, especially weight is lighter, and the more existing lithium ion battery of energy density greatly improves.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the step flow chart of the preparation method of the lithium ion battery of an embodiment of the present invention；
Fig. 2 is the floor map of the copper plastic composite net cloth of the lithium ion battery of an embodiment of the present invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ", " right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more Any and all combinations of relevant listed item.
Referring to Fig. 1, the step flow chart of the preparation method of the lithium ion battery of an embodiment, comprising the following steps:
S110, soft copper wire and the first polymer filament are provided.
It can be conducive to subsequent braiding by providing soft copper wire and the first polymer filament and obtain copper plastic composite net cloth, copper Plastic composite net cloth is neither too hard, nor too soft, and flexibility is strong, is not easily broken in the weaving process, and facilitates bending during subsequent use Or winding, in this way, being conducive to the better lithium ion battery of subsequent processability.
In order to improve the flexibility of copper plastic composite net cloth, for example, the line footpath of the jewelry, expensive clothing and other valuables copper wire is 0.08mm~0.6mm. It is appreciated that the line footpath of soft copper wire has larger impact for the flexibility for the copper plastic composite net cloth being prepared, when thin When the line footpath of soft copper silk is too big, the hardness of soft copper wire can be too big, is easy to increase the braiding difficulty of copper plastic composite net cloth, while The thickness and weight that will lead to the subsequent copper plastic composite net cloth being woven into increase, to influence that higher energy density is prepared Lithium ion battery；However, during weaving copper plastic composite net cloth, having can if the line footpath of the jewelry, expensive clothing and other valuables copper wire is too small Soft copper wire can be caused to be stretched excessively and be broken, verified in this way, being analyzed by many experiments, the line footpath of the jewelry, expensive clothing and other valuables copper wire is 0.08mm~0.6mm can weave to obtain the copper plastic composite net cloth for being more applicable for lithium ion battery, for example, the jewelry, expensive clothing and other valuables copper The line footpath of silk is 0.1mm~0.5mm, in this way, helping subsequent the better lithium ion battery of performance to be prepared.
In one of the embodiments, first polymer filament be pet fiber silk, Fypro silk, polyimide fiber silk, polyvinylidene fluoride silk or aramid fiber silk.
In order to improve the mechanical performance and chemical corrosion resistance of the copper plastic composite net cloth that braiding obtains, for example, described first Polymer filament is pet fiber silk.It is appreciated that polyethylene terephthalate is referred to as poly- Ester (PET) is exchanged by dimethyl terephthalate (DMT) with glycol ester or is first synthesized with terephthalic acid (TPA) and ethylene glycol esterification to benzene The double hydroxyl ethyl esters of dioctyl phthalate, then carry out polycondensation reaction again and are made.Polyethylene terephthalate has excellent physical mechanical Performance and electrical property, or even under high-temperature high-frequency, electrical property is still preferable, in addition, polyethylene terephthalate has ester Key, resistance to organic electrolyte and weatherability are excellent.In this way, compound using the braiding copper modeling of pet fiber silk Screen cloth, the copper plastic composite net cloth enabled to have good physical mechanical property, for example, there is good mechanical property, Impact strength is 4~7 times of other films, and folding resistance and rub resistance are good, while very resistance to inside lithium ion cell has Machine electrolyte, to be conducive to subsequent folding resistance and the more preferable and more frivolous complex copper of resistance to organic electrolyte be prepared Foil, and then more excellent performance of lithium ion battery is prepared conducive to subsequent.For another example, first polymer filament is poly- Nylon silk, it will be understood that polyamide is commonly called as polyamide fibre, is that the thermoplastic resin containing recurring amide radical group on molecular backbone is total Claim, there is good mechanical strength and self-lubrication, the copper plastic composite net cloth made of the braiding of Fypro silk has good Good comprehensive performance, including mechanical property, heat resistance, wear resistance, chemical resistance and self-lubrication.For another example, described One polymer filament be polyimide fiber silk, it will be understood that polyimide fiber silk have good chemical corrosion resistance, The features such as high-strength and high-modulus and large specific surface area, the mechanical strength for the copper plastic composite net cloth that so, it is possible to make braiding to obtain and resistance to The performance of organic electrolyte is more preferable.For another example, first polymer filament is polyvinylidene fluoride silk, it will be understood that poly- Vinylidene fiber filament has excellent chemical corrosion resistance and wearability, also has very high impact resistance intensity, in this way, energy The performance and impact resistance intensity of the resistance to organic electrolyte for the copper plastic composite net cloth for enough obtaining braiding are more preferable, and then are conducive to It is subsequent that the better composite copper foil of performance is prepared.For another example, first polymer filament is aramid fiber silk, Ke Yili Solution, it is a kind of novel high-tech synthetic fibers that aramid fiber, which is also known as phenyl-diformyl phenylenediamine, has superhigh intensity, high-modulus and Nai Gao The excellent performances such as temperature, acid-fast alkali-proof, light-weight, anti-aging, life cycle length, in this way, made of the braiding of aramid fiber silk Copper plastic composite net cloth can have good acid-fast alkali-proof, especially light-weight feature.It should be noted that poly- terephthaldehyde Sour glycol ester fiber filament, Fypro silk, polyimide fiber silk, polyvinylidene fluoride silk and aramid fiber silk weight Amount is smaller compared to metal material, prepares raw material as lithium ion battery, can make the lithium ion battery being prepared Weight substantially reduces, and then is able to ascend the energy density of lithium ion battery, while reducing preparation cost.
S120, the soft copper wire and first polymer filament are woven into copper plastic composite net cloth, with copper metal The copper metal is deposited on by the copper using physical gas-phase deposition using the copper plastic composite net cloth as substrate for target On plastic composite net cloth, composite copper foil is obtained.
By the copper plastic composite net cloth that is woven into soft copper wire and first polymer filament as substrate, then with The copper metal is deposited on the copper plastic composite net cloth by copper metal as target, using physical gas-phase deposition, can Obtain composite copper foil.
The mode of the braiding of the copper plastic composite net cloth uses plain weave mode in one of the embodiments,.
It is appreciated that proof copper-wire braided mode into the net is had more clocks, using different weaving manners can obtain shape and The different mesh of net diameter has lithium ion in the mobility of the subsequent composite copper foil being prepared into and the weight of composite copper foil Certain influence.For example, the soft copper wire and first polymer filament are woven into copper using plain weave mode Plastic composite net cloth.It is appreciated that plain weave refers to that every organizine passes through above and below every tram across, diameter silk and tram one Sample thickness, warp and weft at an angle of 90 degrees weaving manner.So, it is possible so that the precision for the copper plastic composite net cloth being woven into more Add it is uniform and stable, and have good surface smoothness, be conducive to subsequent better deposited copper metal, for another example, copper plastic composite net cloth Mesh number range be 50~100 mesh, the pore diameter range of copper plastic composite net cloth is 0.2mm~2mm, in this way, being more advantageous to subsequent system The migration rate of lithium ion in standby obtained lithium ion battery is higher, so be conducive to improve lithium ion battery capacity and Energy density.
Referring to Fig. 2, in order to improve the stretch-proof and bending resistance of copper plastic composite net cloth, for example, plain weave obtains The diameter silk of copper plastic composite net cloth 10 be the first polymer filament 100, tram is more soft copper wires 200 and more first Polymer filament 100 alternates setting.It is appreciated that the first polymer filament 100 has good mechanical property, it is resistance to Impact strength is high, strong, the especially light-weight feature of resistance to organic electrolyte performance, in this way, diameter silk is the first macromolecular fibre Silk 100 enables to copper plastic composite net cloth 10 to have better mechanical performance, in subsequent use process, tensile strength and resistance to Bending performance is more preferable, especially can reduce the weight of copper plastic composite net cloth 10, so as to reduce it is subsequent be prepared answer Closing the weight of copper foil, it will be understood that battery energy density refers to the electric energy that the mean unit volume of battery or quality are released, The weight that lithium ion electronics auxiliary material is prepared by reduction is conducive to that the smaller lithium ion battery of weight is prepared, and then advantageous In the energy density for improving lithium ion battery；Further, the tram of copper plastic composite net cloth 10 is more soft copper wires 200 and more The first polymer filament of root 100 alternates setting, it will be understood that the pliability of soft copper wire 200 is higher, pliable, such as More soft copper wires 200 and more first polymer filaments 100, are alternated that be provided as tram braiding copper modeling compound by this Screen cloth 10 can be also equipped with good while meeting copper plastic composite net cloth 10 with good flexibility and bending resistance Metallicity, it is more easily molded, it is subsequent be prepared into negative electrode tab when, practical application can be more suitable for.It needs to further illustrate It is that more soft copper wires 200 and more first polymer filaments 100 are alternated and are provided as tram, then is high by first Molecular fiber silk 100 passes through above and below every tram across, at the weaving manner of an angle of 90 degrees, can weave to obtain mesh more Uniformly, stability is higher and has the copper plastic composite net cloth 10 of excellent surface flatness, and then is more advantageous to subsequent by copper metal It is deposited on the copper plastic composite net cloth 10, obtains the more excellent composite copper foil of performance, so, it is possible to reduce moving for lithium ion Move impedance, more conducively raising lithium ion while being easier to Electolyte-absorptive in the migration rate of inside lithium ion cell, improve lithium from The capacity of sub- battery, and then can be prepared that energy density is higher and the higher lithium ion battery of cyclical stability.
Electric conductivity is more preferable in order to obtain and the better composite copper foil of adhesiveness is moulded using copper metal as target with the copper Composite webs are substrate, and the copper metal is deposited on the copper plastic composite net cloth using physical gas-phase deposition, is obtained Composite copper foil.It is appreciated that physical gas-phase deposition is under vacuum conditions, using physical method, by solid or liquid material Material source surface is gasificated into gaseous atom, molecule or partial ionization into ion, and by low-pressure gas or plasma process, in base Body surface face deposition has the technology of the film of certain specific function, and physical gas phase deposition technology can not only deposited metal film, conjunction Golden film, can be with deposited compound, ceramics, semiconductor, polymer film etc..For example, the physical gas-phase deposition is vacuum Vapor deposition mode.It is appreciated that vacuum evaporation refers to, under vacuum conditions, make metal, metal alloy or compound evaporation, then It is deposited on matrix surface, there are commonly resistance heating, high-frequency induction heating, electron beam, laser beam or ions for the method for evaporation Shu Gaoneng bombardment plating material, makes metal, metal alloy or compound flash to gas phase, is subsequently deposited upon matrix surface and forms film. For example, in the present embodiment, the aluminum metal is deposited on the plastic-aluminum combined screen cloth using vacuum evaporation mode, it is specific to wrap It includes following steps: copper plastic composite net cloth S121, being subjected to ultrasonic cleaning；S122, copper metal is carried out in vacuum evaporation plating machine Shove charge；S123, the vacuum degree of vacuum chamber is adjusted to 3 × 10-3Pa~6 × 10-3Pa；S124, vacuum evaporation operation is carried out；S125, Composite copper foil is taken out after cooling.For example, using 45 DEG C~65 DEG C of operating temperature and the cleaning frequency pair of 28KHz~45KHz The copper plastic composite net cloth carries out ultrasonic cleaning；For another example, vapor deposition distance is 9cm~17cm, and evaporation current is 350A~450A, Vaporization voltage is 2V~9V；For another example, evaporation time is 20min~30min；It so, it is possible to obtain electric conductivity and adhesive force be more preferable, Coating microstructure uniformly, fine and close, composite copper foil that can be especially more frivolous with good oxidation resistance, be conducive to it is subsequent can be with negative Pole slurry preferably adheres to, and obtains that caking property is stronger and the higher negative electrode tab of stability, and then is conducive to subsequent energy be prepared The higher lithium ion battery of density.
The high-performance composite copper foil that electron mobility is higher and more frivolous is enabled in order to obtain, for another example, for example, institute Stating physical gas-phase deposition is magnetron sputtering mode, and the copper metal is deposited on the copper using magnetron sputtering mode and is moulded again It closes on screen cloth, the more excellent composite copper foil of performance can be obtained.It is appreciated that magnetron sputtering is to utilize the ion with charge Have the characteristics that certain kinetic energy after accelerating in the electric field, ion is guided to the substance to be sputtered (sputtering target material) into as target electrode (cathode).In the suitable situation of ion energy, the atom of target material surface is splashed in the atomic collision of incident ion and target material surface It shoots out, these atoms for being sputtered out have certain kinetic energy, and can fly along certain direction, and directive substrate is simultaneously Under deposition on substrate, to realize the formation of film.During carrying out magnetron sputtering, generally first argon gas is inputted true Plenum chamber, electronics collide during flying to substrate with ar atmo under the action of electric field E, its ionization is made to produce argon Ion and new electronics.Argon ion accelerates to fly to cathode target under the action of magnetic field and electric field, and bombards target surface with high-energy, Sputter target.In the present embodiment, argon gas is inputted into vacuum chamber, using copper plastic composite net cloth as substrate, by copper gold Category is sputtered on copper plastic composite net cloth by way of magnetron sputtering, and is deposited on copper plastic composite net cloth, is formed compound Copper foil.The more excellent composite copper foil of performance in order to obtain, for example, the copper content of the copper metal is greater than 99.5%, in this way, energy Deposition of the copper metal on composite copper foil is enough improved, forms that copper content is higher and the better composite copper foil of continuity；For example, The composite copper foil with a thickness of 2 μm~5 μm, so, it is possible the more frivolous softness of the composite copper foil for making to be prepared, after being convenient for Phase winding etc., while the weight of composite copper foil being enabled to reduce, so that the smaller negative electrode tab of weight be prepared, and then it is conducive to The energy density for the lithium ion battery being prepared is improved.For another example, copper metal is splashed using the sputtering power of 40W~100W It is incident upon on copper plastic composite net cloth, obtains composite copper foil.It is appreciated that sputtering power being affected to the membrane structure of formation, Smaller, the film of a possibility that when sputtering power is smaller, the kinetic energy of sputtering particle is smaller, and diffusion into the surface migration and recrystallization occurs Particle size is smaller.With the increase of sputtering power, sputter rate is also increased with it, i.e., sputtering time under the same conditions, The number of particles sputtered under high power is more, and the probability that direct collision is nucleated between particle increases, in addition, the energy of sputtering particle Also it increases with it, high-energy increases diffusion rate of the sputtering particle on substrate, so that particle is incorporated into size larger Crystal grain so that the compactness of film improves, crystal structure is also advanced optimized.If however, sputtering power It is too big, then it is easy to destroy the structure of copper plastic composite net cloth, and then influence the formation of film, or make the thickness of film uniform Property be affected, in this way, analyze by many experiments, it is multiple that copper metal is sputtered by copper modeling using the sputtering power of 40W~100W It closes on screen cloth, enables to copper metal more to anchor on copper plastic composite net cloth, to form the better complex copper of compactness Foil.In order to be prepared, capacity is bigger and it is compound to be sputtered onto copper modeling for another example by the better composite copper foil of cyclical stability for copper metal When on screen cloth, sputtering time is 2h~4h, and for another example, the air pressure of argon gas is 0.4Pa~1.0Pa when sputtering, and the flow of argon gas is 35sccm~60sccm, for another example, the vacuum degree of vacuum chamber are 1.0 × 10-5Pa~1.0 × 10-4Pa so, it is possible to make to sputter The capacity of obtained composite copper foil is bigger and cyclical stability is more preferable.
The high-performance composite copper foil that electron mobility is higher and more frivolous is enabled in order to obtain, it is for another example, described multiple The surface density for closing copper metal in copper foil is 15g/m2~30g/m2.It is appreciated that battery energy density refers to the mean unit of battery The electric energy that volume or quality are released, the weight of the copper foil of existing lithium ion battery in lithium ion battery proportion compared with Greatly, it is only second to positive and negative anodes powder, about 6%~20%, so that the weight of battery is larger, to reduce lithium ion battery Energy density.In this way, the surface density of copper metal is 15g/m in the composite copper foil in the present embodiment in order to reduce the weight of battery2 ~30g/m2, in this way, further reduced the weight of lithium ion battery in the case where not influencing the superperformance of lithium ion battery Amount, and then improve the energy density of the lithium ion battery.For example, the surface density of copper metal is 17g/ in the composite copper foil m2~25g/m2, so, it is possible so that the energy density for the lithium ion battery being prepared is higher.
S130, negative electrode slurry is coated on the composite copper foil, is dried, is cold-pressed, slitting and sectioning obtain Negative electrode tab.
It, can by drying, cold pressing, slitting and sectioning by the way that negative electrode slurry to be coated on the composite copper foil Obtain the negative electrode tab of lithium ion battery.
In order to improve the adhesiveness of negative electrode slurry and the composite copper foil, so that negative electrode slurry is not easily to fall off, for example, also right The composite copper foil carries out pre-etching operation, specifically comprises the following steps: that the composite copper foil surface is first carried out derusting operation, The composite copper foil is soaked in progress pre-etching processing in ethanedioic acid solution again.It is appreciated that the composite copper foil is due to sudden and violent In air, surface is easy that there are greasy dirt or rusty stains to dew, to will affect being tightly bonded for the composite copper foil and negative electrode slurry Close property, or even it is easy to cause falling off for negative electrode slurry, it is thus desirable to which the composite copper foil surface is first carried out derusting operation, example Such as, it is further taken out after the composite copper foil being soaked in dilution heat of sulfuric acid, it is dry, it so, it is possible the rusty stain of the composite copper foil It is purged, is conducive to subsequent coating negative electrode slurry.It, will also be described in order to improve the caking property of the composite copper foil and negative electrode slurry Composite copper foil is soaked in progress pre-etching processing in ethanedioic acid solution, can be improved the roughness on the composite copper foil surface.Example Such as, by the composite copper foil be soaked in the time in ethanedioic acid solution be 2min~8min, for another example, the ethanedioic acid solution Mass concentration is 5%~10%, and for another example, the temperature of the pre-etching processing is controlled at 40 DEG C~80 DEG C, be so, it is possible so that institute The pre-etching effect for stating composite copper foil is more preferable, simultaneously, additionally it is possible to so that the surface roughness of the composite copper foil is higher, increase ratio Surface area enables to the cohesive force between the composite copper foil surface and negative electrode slurry stronger after being coated with negative electrode slurry, thus Avoiding negative electrode tab from occurring in subsequent cold pressing, slitting and slicing operations locally even, large area drops off, to be conducive to Improve the qualification rate for the lithium ion battery being prepared.
In order to improve the electric conductivity of negative electrode tab, for example, the negative electrode slurry includes negative electrode active material, pore creating material, leads Electric agent, bonding agent and solvent, wherein the negative electrode active material, the pore creating material, the conductive agent, the bonding agent and institute The mass ratio for stating solvent is (90~96): (2~6): (2~4): (3~6): (75~90), by by the negative electrode active material Matter, the pore creating material, the conductive agent, the bonding agent and the solvent are mixed, and negative electrode slurry is obtained.It will be described Negative electrode slurry is coated on the composite copper foil, is dried, cold pressing, and slitting and sectioning obtain negative electrode tab.It can manage Solution, the performance of electrode slurry have important influence to the performance of lithium ion battery, and each component dispersion is more uniform in electrode slurry, Electrode slice just has better processing performance, and the distribution of impedance of electrode slice everywhere is more uniform, while the active matter in charge and discharge The effect of matter can play it is bigger so that the performance of lithium ion battery is more excellent.For example, by the negative electrode active During substance, the pore creating material, the conductive agent, the bonding agent and the solvent are mixed, it is also added into Dispersing agent so, it is possible to avoid the occurrence of asking for reunion or agglomeration so that each component in mixed system mixes more uniform Topic so, it is possible for example, the dispersing agent is at least one of carboxymethyl cellulose, calgon so that the cathode Active material, the pore creating material, the conductive agent, the bonding agent and the solvent disperse more uniform, thus mixing It after stirring, obtains each component and disperses more uniform negative electrode slurry, for another example, using 650 revs/min~900 revs/min of stirring Speed is stirred the negative electrode active material, the pore creating material, the conductive agent, the bonding agent and the solvent, such as This is conducive to subsequent the better lithium ion battery of performance be prepared.For another example, the negative electrode active material is artificial graphite, naturally At least one of graphite, hard carbon, silicon-carbon, graphene and lithium titanate.It is appreciated that negative electrode active material is lithium ion battery Important component, it directly affects the key indexes such as the energy density, cycle life and security performance of battery.In order to improve The capacity of lithium ion battery, and improve the cyclic durability of lithium ion battery, for example, the negative electrode active material is metatitanic acid Lithium, it will be understood that lithium titanate has the characteristics that high security, high stability, long-life and environmentally protective, using lithium titanate as lithium The negative electrode active material of ion battery enables to the lithium ion battery safety performance being prepared higher, and stability is stronger, and Cycle-index is more；For another example, the negative electrode active material be silicon-carbon, it will be understood that nano silica fume have purity is high, partial size it is small, Be evenly distributed, large specific surface area, high surface, low apparent density the features such as, and it is nontoxic, tasteless, so, it is possible to improve lithium from The capacity of sub- battery, and then improve the energy density of lithium ion battery.
It should be noted that after negative electrode slurry is coated on composite copper foil, it is also necessary to be dried, be cold-pressed, slitting and Sectioning, to obtain negative electrode tab.It is appreciated that during the negative electrode slurry is coated on the composite copper foil, If ambient humidity is larger, negative electrode slurry is easy to absorb the moisture in environment, and the viscosity of negative electrode slurry is caused to be gradually increased, and destroys negative The mobility and uniform state of pole slurry, lead to that the coated face density of negative electrode slurry is unstable, appearance is coarse for coating, pole piece internal resistance Larger or pole piece, which covers, expects that caking property is bad, is easy to drop off during subsequent operation, influences the performance of lithium ion battery；Example Such as, during coating by the humid control of negative electrode slurry in the range of 0%~8% relative humidity, so, it is possible so that The negative electrode slurry is coated on the better effect on the composite copper foil.For another example, the temperature of the drying process is 40 DEG C~120 ℃.For another example, using the cold pressing speed of 7m/min~45m/min, the cold pressing pressure of 3MP~70MP, between the cold pressing of 60 μm~1.0mm Gap carries out cold press operation to negative electrode tab, so, it is possible the porosity for improving negative electrode tab, while making the pore size to be formed more Uniformly, under conditions of guaranteeing negative electrode tab durability, the charging ability and circulation ability of lithium ion battery are substantially increased.Again will The negative electrode tab carries out slitting and cut-parts operation, the negative electrode tab of specification required for capable of obtaining.
It should be strongly noted that in the present embodiment, the length of the length direction of the negative electrode tab and the soft copper wire It is identical to spend direction.It is appreciated that the soft copper wire and first polymer filament are woven using plain weave mode When at copper plastic composite net cloth, tram is that more soft copper wires and more first polymer filaments alternate setting, by copper gold Category is deposited on to obtain composite copper foil on the copper plastic composite net cloth, then negative electrode slurry is coated on the composite copper foil, into Row drying, cold pressing, slitting and sectioning, obtain negative electrode tab, wherein the length direction of the negative electrode tab and the soft copper wire Length direction it is identical, in this way, soft copper wire can preferably enhance the mechanical property of negative electrode tab, so that the stability of negative electrode tab And bending resistance is stronger, the rigidity that especially soft copper wire itself has can play good support to negative electrode tab inside and make With so that the overall structure of negative electrode tab is more firm, in the subsequent operation for winding and obtaining battery core, so that the mechanicalness of battery core More preferably, and then the stronger lithium ion battery of stability can be prepared conducive to subsequent.
S140, soft aluminium wire and the second polymer filament are provided.
It can be conducive to subsequent braiding by providing soft aluminium wire and the second polymer filament and obtain plastic-aluminum combined screen cloth, it can To understand, the embedding lithium capacity of aluminium is smaller, and is able to maintain electrochemically stable, is suitable for the plus plate current-collecting body of lithium ion battery, The soft more conventional aluminium flexibility of aluminium wire is stronger, is not easily broken in the weaving process, and facilitates during subsequent use curved Bent or winding, in this way, being conducive to improve the subsequent efficiency for preparing lithium ion battery.In order to further increase the plastic-aluminum that braiding obtains The flexibility and bending resistance of composite webs additionally provide stronger second polymer filament of flexibility, for example, described second Polymer filament is pet fiber silk or polyimide fiber silk.It is appreciated that poly- terephthaldehyde Sour glycol ester has excellent physical mechanical property and electrical property, or even under high-temperature high-frequency, electrical property is still preferable, separately Outside, polyethylene terephthalate has ester bond, and resistance to organic electrolyte and weatherability are excellent.In this way, using poly- to benzene two Material of the formic acid glycol ester fiber filament as the subsequent plastic-aluminum combined screen cloth of braiding, more enough plastic-aluminum combined screen cloths for obtaining braiding With good mechanical property, folding resistance and rub resistance, while the organic electrolyte of very resistance to inside lithium ion cell, thus Be conducive to it is subsequent folding resistance and the more preferable and more frivolous clad aluminum foil of resistance to organic electrolyte is prepared, and then after being conducive to It is continuous that more excellent performance of lithium ion battery is prepared.It is appreciated that polyimide fiber silk has good chemically-resistant rotten The features such as corrosion, high-strength and high-modulus and large specific surface area, so, it is possible the mechanical strength for the plastic-aluminum combined screen cloth for obtaining braiding It is more preferable with the performance of resistance to organic electrolyte.
S150, the soft aluminium wire and second polymer filament are woven into plastic-aluminum combined screen cloth, with aluminum metal The aluminum metal is deposited on by the aluminium using physical gas-phase deposition using the plastic-aluminum combined screen cloth as substrate for target On plastic composite net cloth, clad aluminum foil is obtained.
It is appreciated that the working principle of lithium ion battery is a kind of electrochemical appliance for converting chemical energy to electric energy, need Want a kind of medium that the electric energy that chemical energy converts is passed out, this just needs conductive material, while preparing lithium ion battery During, it is also necessary to be wound with the processes such as lamination, in this way, will conduct electricity very well in present embodiment, it is soft and Cheap aluminum metal is target, using the plastic-aluminum combined screen cloth as substrate, using physical gas-phase deposition by the aluminium Metal deposit can obtain the clad aluminum foil for being more in line with actual demand on the plastic-aluminum combined screen cloth.
By the plastic-aluminum combined screen cloth that is woven into the soft aluminium wire and second polymer filament as substrate, Using aluminum metal as target, the aluminum metal is deposited on the plastic-aluminum combined screen cloth using physical gas-phase deposition, energy Access clad aluminum foil.In order to obtain more resistant to stretching and more resistant to the plastic-aluminum combined screen cloth of bending, for example, the plastic-aluminum combined net The weaving manner of cloth uses plain weave mode.It is appreciated that plain weave refers to every organizine across on every tram Under across, diameter silk thickness as tram, warp and weft so, it is possible at the weaving manner of an angle of 90 degrees so that being woven into The more uniform stabilization of the precision of plastic-aluminum combined screen cloth, and there is good surface smoothness, it is conducive to subsequent better deposition aluminium gold Belong to.Further, in the plain weave mode of the plastic-aluminum combined screen cloth, diameter silk is the second polymer filament, and tram is More soft aluminium wires and more second polymer filaments alternate setting.It is appreciated that the power of the second polymer filament It is excellent to learn performance, folding resistance and rub resistance, and softness is good, using second polymer filament as braiding plastic-aluminum The softness of the diameter silk of composite webs, the plastic-aluminum combined screen cloth that braiding can be made to obtain is stronger, and more stretch-proof and bending. And more soft aluminium wires and more second polymer filaments are alternated to the tram for being provided as weaving plastic-aluminum combined screen cloth, It can be in conjunction with the soft rigidity of aluminium wire and the plasticity of the second polymer filament, so that plastic-aluminum combined screen cloth is soft or hard more suitable In, there can be higher applicability in the processes such as subsequent winding, such as be more easier to form, such as be prepared into energy after battery core Enough there is better support effect, and then improve the stability of inside lithium ion cell；In this way, by more soft aluminium wires and more Second polymer filament, which alternates, is provided as tram, then by the second polymer filament across above and below every tram It passes through, at the weaving manner of an angle of 90 degrees, can weave to obtain that mesh is more uniform, and stability is higher and has excellent surface smooth Degree plastic-aluminum combined screen cloth, and then be more advantageous to it is subsequent aluminum metal is deposited on the plastic-aluminum combined screen cloth, obtain performance more Add excellent clad aluminum foil, so, it is possible the migration impedance for reducing lithium ion, more conducively raising lithium ion is in lithium ion battery The migration rate in portion, while it being easier to Electolyte-absorptive, the capacity of lithium ion battery is improved, and then energy density can be prepared The higher lithium ion battery of higher and cyclical stability.
Electric conductivity is more preferable in order to obtain and the better clad aluminum foil of adhesiveness, using aluminum metal as target, with the plastic-aluminum Composite webs are substrate, and the aluminum metal is deposited on the plastic-aluminum combined screen cloth using physical gas-phase deposition, is obtained Clad aluminum foil.The clad aluminum foil of better quality in order to obtain so, it is possible for example, the aluminum content of the aluminum metal is greater than 98% Deposition of the aluminum metal on clad aluminum foil is improved, forms that aluminum content is higher and the better clad aluminum foil of continuity.For another example, institute The mode that physical gas-phase deposition is magnetron sputtering is stated, using aluminum metal as target, using the plastic-aluminum combined screen cloth as substrate, is led to It crosses and aluminum metal is sputtered on the plastic-aluminum combined screen cloth, the excellent clad aluminum foil of electric conductivity can be obtained, for another example, use Aluminum metal is sputtered on clad aluminum foil by the sputtering power of 50W~100W, obtains clad aluminum foil.It is appreciated that sputtering power pair The membrane structure of formation is affected, and when sputtering power is smaller, the kinetic energy of sputtering particle is smaller, and diffusion into the surface migration occurs A possibility that with recrystallization, is smaller, and film particles size is smaller.With the increase of sputtering power, sputter rate is also increased with it, I.e. sputtering time under the same conditions, the number of particles sputtered under high power is more, between particle direct collision be nucleated it is several Rate increases, in addition, the energy of sputtering particle also increases with it, high-energy increases diffusion rate of the sputtering particle on substrate Greatly, particle is made to be incorporated into larger-size crystal grain so that the compactness of film improves, crystal structure also obtained into One-step optimization.If being then easy to destroy the structure of clad aluminum foil, and then influence the shape of the film however, sputtering power is too big At, or the thickness uniformity of film is affected, in this way, the sputtering power using 50W~100W sputters aluminum metal To clad aluminum foil, it can obtain that compactness is higher and the better clad aluminum foil of electric conductivity.For another example, sputtering time be 2h~ 4h, adjusting air pressure are 0.5Pa~1.8Pa, and the flow of argon gas is 30sccm~45sccm, and for another example, the vacuum degree of vacuum chamber is 1.5×10-5Pa~2.0 × 10-4Pa, the capacity for the clad aluminum foil that so, it is possible to make sputtering to obtain is bigger and cyclical stability More preferably.
S160, anode sizing agent is coated on the clad aluminum foil, is dried, is cold-pressed, slitting and sectioning obtain Positive plate.
It, can by drying, cold pressing, slitting and sectioning by the way that anode sizing agent to be coated on the clad aluminum foil Obtain the positive plate of lithium ion battery.
In order to improve the electric conductivity of positive plate, for example, the anode sizing agent is positive active material, pore creating material, conduction Agent, bonding agent and solvent be mixed and are made.For another example, the positive active material is lithium carbonate, lithium hydroxide, acetic acid Lithium, lithium citrate, lithium oxalate, cobaltosic oxide, cobalt sesquioxide, cobalt hydroxide, cobalt nitrate, cobalt acetate, aluminum nitrate, oxidation At least one of aluminium, aluminum sulfate.It is appreciated that positive electrode is the important component of lithium ion battery, directly affect The parameters such as capacity, the cycle performance of lithium ion battery.For example, the positive active material is lithium hydroxide, it will be understood that hydrogen-oxygen Change lithium has stability and the good advantage of consistency as a positive electrode active material, the melt water of lithium hydroxide and decomposition temperature compared with Height, and do not have the presence of the release of carbon monoxide without redox reaction occurs in sintering process, so, it is possible so that The stability and consistency for the positive plate being prepared are more preferable.For another example, the pore creating material is ammonium hydrogen carbonate, oxalic acid, ammonium oxalate, carbon At least one of sour ammonium and ammonium nitrate, it will be understood that pore creating material enable to anode sizing agent decomposed during heated and Generate a large amount of bubble so that the positive plate of lithium ion battery have higher porosity, while can guarantee again anode sizing agent with The intensity that clad aluminum foil combines between the two, for example, the pore creating material is ammonium hydrogen carbonate, oxalic acid, ammonium oxalate, ammonium carbonate and ammonium nitrate Mixture, wherein the ammonium hydrogen carbonate, the oxalic acid, the ammonium oxalate, the ammonium carbonate and the ammonium nitrate mass ratio Example is (2~13): (3~8): (4~12): (6~18): (2~11) so, it is possible the hole for further increasing the positive plate Gap rate, while the bond strength between anode sizing agent and the clad aluminum foil can be enhanced.In order to improve the electric conductivity of positive plate Can, and anode sizing agent is made to form good conductive network in positive plate, mitigate the weight of positive plate, improves lithium-ion electric The high rate during charging-discharging in pond, for example, the conductive agent is at least one of carbon fiber, acetylene black and carbon nanotube, such as This, can be improved transport efficiency of the lithium ion in positive electrode, to improve the efficiency for charge-discharge of positive plate, and then be conducive to Improve the energy density for the lithium ion battery being prepared.
There is stronger cementability in order to improve after anode sizing agent is coated on composite copper foil, while making subsequent be prepared Positive plate it is more soft, it is more preferable by the performance of electrolyte and cycle performance is more preferable, in the process for preparing anode sizing agent In, it is also added into bonding agent, for example, the bonding agent is butadiene-styrene rubber and sodium carboxymethylcellulose, Kynoar and poly- third At least one of olefin(e) acid.So, it is possible so that the performance for the anode sizing agent being prepared is higher, conducive to it is subsequent be coated on it is compound After on copper foil, what can be bonded is even closer, so that the positive plate being prepared can preferably pass through electrolyte, simultaneously Has higher cycle performance.
During preparing anode sizing agent, first pore creating material and bonding agent can be added in solvent mix and stirred It mixes, for example, mixing speed is 160 revs/min~420 revs/min, so, it is possible so that pore creating material and bonding agent sufficiently dissolve In a solvent；Then conductive agent and positive active material are added in the solvent again, continues to mix stirring, for example, using Mixing speed be 200 revs/min~400 revs/min, so, it is possible so that positive active material, pore creating material, conductive agent, viscous It connects agent and solvent sufficiently and uniformly mixes, obtain the more uniform anode sizing agent of quality, be conducive to subsequent be coated on institute , can be more smooth after stating on clad aluminum foil, it is less prone to the problem of breaking band or tomography.For example, the solvent is ethyl alcohol, second two At least one of alcohol, propyl alcohol, isopropanol, acetone, N-Methyl pyrrolidone and deionized water.It so, it is possible so that anode is living Property substance, pore creating material, conductive agent and bonding agent are preferably dissolved in the solvent, obtain the better anode sizing agent of performance.
It after the anode sizing agent is coated on the clad aluminum foil, is dried, is cold-pressed, slitting and slice behaviour Make, positive plate can be obtained.For example, ambient humidity is controlled into the range in 0%~9% relative humidity during coating, It so, it is possible the moisture for avoiding anode sizing agent from being absorbed in environment in coating, viscosity caused to increase, and influence the stream of anode sizing agent Dynamic property, so that the problem that the surface density of anode sizing agent is not sufficiently stable after coating or appearance is more coarse.For another example, using 50 DEG C~anode sizing agent is dried 80 DEG C of temperature.For another example, using the cold pressing speed of 7m/min~45m/min, 5MP~40MP Cold pressing pressure, 45 μm~80 μm of cold pressing gap carries out cold press operation, so, it is possible the porosity for improving positive plate, simultaneously So that the pore size of the clad aluminum foil formed is more uniform, the charging ability and circulation energy of lithium ion battery are substantially increased Power.Positive plate after drying and cold pressing is subjected to slitting and sectioning, is first cut into the positive plate of big item, required for being then cut into Specification positive plate.
It should be strongly noted that in the present embodiment, the length of the length direction of the positive plate and the soft aluminium wire It is identical to spend direction.It is appreciated that the plastic-aluminum combined screen cloth obtained using plain weave mode, tram is more soft aluminium wires and more The second polymer filament of root alternates setting, and clad aluminum foil is deposited on the plastic-aluminum combined screen cloth by aluminum metal and obtains, Positive plate is coated on the plastic-aluminum combined screen cloth by anode sizing agent again and is obtained, in this way, the length direction of the positive plate and institute The length direction for stating soft aluminium wire is identical, and positive plate is enabled to have better mechanical property, curved in subsequent operating winding Folding endurance can be more preferable.
S170, the negative electrode tab, insulation diaphragm and the positive plate are wound operation, obtain battery core.
It is appreciated that battery core preparation is an important procedure in lithium ion battery manufacture process, by by the cathode Piece, insulation diaphragm and the positive plate are wound operation, can obtain the battery core of lithium ion battery, are prepared conducive to subsequent Lithium ion battery.For example, the insulation diaphragm is the polyolefin porous membrane of high-strength thin-film, it will be understood that the performance of diaphragm Interfacial structure, the internal resistance etc. for determining battery, directly affect the characteristics such as capacity, circulation and the security performance of battery, performance is excellent Different diaphragm to improve battery comprehensive performance play an important role, the polyolefin porous membrane have good insulating properties and Ion transmission, and electrolyte resistance corrosivity is excellent, so, it is possible that the battery core being prepared is made to have more excellent performance, benefit The higher lithium ion battery of energy density is prepared in subsequent.
It is to be particularly noted that in the present embodiment, the length of the length direction of the insulation diaphragm and the negative electrode tab The length direction for spending direction and the positive plate is identical.It is appreciated that the length direction of the negative electrode tab and the soft copper wire Length direction it is identical, while the length direction of the positive plate is identical as the soft length direction of aluminium wire, in this way, described The length direction of insulation diaphragm is identical as the length direction of the soft copper wire and the soft length direction of aluminium wire, by institute It states negative electrode tab, insulation diaphragm and the positive plate to be wound during operation obtains battery core, along soft copper wire and thin The length direction of soft aluminium wire is wound, can obtain the more stable battery core of structure, this is because wire is inherently Rigidity can play good supporting role to battery core, while be more advantageous to anode ring forming, since battery core is the curved knot of winding Structure, it is meant that its active force suffered by radial direction is smaller, merely uses polymer filament, in this way, at This can reach with quality greatly reduces, however, its suffered squeezing action on axial direction (transverse direction or weft direction) Power be it is biggish, as weft, be then easy to happen when using pure metal silk and be bent the larger problem of difficulty, is i.e. rigidity is excessive, curved Bent wind resistance is big, can oppress diaphragm or coating deformation or damaged, according to pure polymer filament as weft, then It is easy to restore loose condition (of surface) after winding bending, i.e. state stability is poor, but the side of the braiding when the copper plastic composite net cloth Formula uses plain weave mode；In the plain weave mode of the copper plastic composite net cloth, diameter silk is the first macromolecular fibre Silk, tram are that more soft copper wires and more first polymer filaments alternate setting；The volume of the plastic-aluminum combined screen cloth Mode is knitted using plain weave mode；In the plain weave mode of the plastic-aluminum combined screen cloth, diameter silk is the second macromolecule fibre Silk is tieed up, tram is that more soft aluminium wires and more second polymer filaments alternate setting；The length side of the negative electrode tab To identical as the soft length direction of copper wire；The length direction phase of the length direction of the positive plate and the soft aluminium wire Together；The length direction of the insulation diaphragm is identical as the length direction of the length direction of the negative electrode tab and the positive plate, then The smooth progress of bending operation can ensured to wind, and can be realized preferable state stability, and grasped in subsequent aging In the hot pressing of work, it is disconnected that the weft of pole piece cannot be extruded cause.
S180, the battery core is placed in shell, injects electrolyte, then carry out chemical conversion and partial volume operation, obtain lithium ion Battery.
By the way that the battery core to be placed in shell, inject electrolyte, then carry out chemical conversion and partial volume operation, can obtain lithium from Sub- battery.For example, the battery core is placed in steel shell in injection electrolyte, so as to the subsequent lithium ion that function admirable is prepared Battery.The higher lithium ion battery of energy density in order to obtain, for another example, the electrolyte be electrolyte lithium salt, organic solvent and Additive is mixed to prepare, for example, the electrolyte lithium salt is at least one of LiPF6, LiClO4 and LiAsF6；For another example, institute Stating organic solvent is propene carbonate, butylene, diethyl carbonate, dimethyl carbonate, tetrahydrofuran, gamma-butyrolacton, first Sour methyl esters, at least one of methyl acetate；For another example, the additive is vinylene carbonate, in sour ethylene vinylene It is at least one；It so, it is possible that the more excellent lithium ion battery of performance is prepared.
It is appreciated that need to carry out the charge and discharge of a low current for the lithium ion battery just manufactured, this be by After battery completes, electrode material is not to be in most preferably applicable state or physical property is improper, such as particle is too Greatly, it is mutually not right in itself to contact not close etc. or object, such as the metal oxide cathode of some alloy mechanism, needs to carry out head Secondary charge and discharge activate it.In this way, the battery core is placed in shell and after injecting electrolyte, it is also necessary to chemical conversion operation is carried out, To carry out first charge-discharge to lithium ion battery to activate the lithium ion battery.In order to enable at the beginning of lithium ion battery The property and composition of the SEI film formed after secondary charging chemical conversion are more stable, guarantee the stability of battery performance, then to institute It states lithium ion battery sequence and carries out chemical conversion and partial volume operation, lithium ion battery with high energy density can be obtained.For example, by the lithium Ion battery is melted under the high temperature conditions, is conducive to SEI structure and is recombinated, and is formed loose porous film, be so, it is possible So that the energy density for the lithium ion battery being prepared is higher, while voltage is more accurate and stablizes.
The preparation method of above-mentioned lithium ion battery, it is multiple by the way that soft copper wire and the first polymer filament are woven into copper modeling Screen cloth is closed, copper metal is deposited on copper plastic composite net cloth using physical gas-phase deposition and obtains composite copper foil, cathode is starched Material, which is coated on composite copper foil, obtains negative electrode tab；Soft aluminium wire and the second polymer filament are woven into plastic-aluminum combined screen cloth, Aluminum metal is deposited on plastic-aluminum combined screen cloth using physical gas-phase deposition and obtains clad aluminum foil, anode sizing agent is coated on Positive plate is obtained on clad aluminum foil；It is wound negative electrode tab, insulation diaphragm and positive plate to obtain battery core again, battery core is entered Lithium ion battery is obtained after shell, fluid injection, chemical conversion and partial volume operation, obtained capacity of lithium ion battery is bigger, efficiency for charge-discharge It is higher, and cyclical stability is more preferable, especially weight is lighter, and the more existing lithium ion battery of energy density greatly improves.
It is below specific embodiment part.
Embodiment 1
(1) soft copper wire and pet fiber silk are provided；
(2) use plain weave mode by soft copper wire and pet fiber silk be woven into mesh number for The copper plastic composite net cloth of 80 mesh, central diameter silk are pet fiber silk, and tram is more soft copper wires And more pet fiber silks alternate setting；Using copper metal as target, it is with copper plastic composite net cloth Copper metal is deposited on copper plastic composite net using vacuum evaporation mode after copper plastic composite net cloth is carried out ultrasonic cleaning by substrate On cloth, wherein vacuum degree is 3 × 10-3Pa, vapor deposition distance are 9cm, evaporation current 350A, vaporization voltage 2V, evaporation time For 20min, composite copper foil is obtained；
(3) negative electrode slurry is coated on composite copper foil, is dried, is cold-pressed, slitting and sectioning obtain cathode Piece；
(4) soft aluminium wire and pet fiber silk are provided；
(5) use plain weave mode by soft aluminium wire and pet fiber silk be woven into mesh number for The plastic-aluminum combined screen cloth of 80 purposes, central diameter silk are pet fiber silk, and tram is more soft aluminium wires And more pet fiber silks alternate setting；Using aluminum metal as target, it is with plastic-aluminum combined screen cloth Aluminum metal is deposited on plastic-aluminum combined net using magnetron sputtering mode after plastic-aluminum combined screen cloth is carried out ultrasonic cleaning by substrate On cloth, clad aluminum foil is obtained；
(6) anode sizing agent is coated on clad aluminum foil, is dried, is cold-pressed, slitting and sectioning obtain anode Piece；
(7) negative electrode tab, polyolefin porous membrane and positive plate are wound operation, obtain battery core；
(8) battery core is placed in steel shell, injects electrolyte, then carry out chemical conversion and partial volume operation, obtain the lithium of embodiment 1 from Sub- battery.
Embodiment 2
(1) soft copper wire and Fypro silk are provided；
(2) use plain weave mode by soft copper wire and Fypro silk be woven into mesh number for 90 mesh copper modeling it is compound Screen cloth, central diameter silk are Fypro silk, and tram is that more soft copper wires and more Fypro silks are alternated and set It sets；Using copper metal as target, using copper plastic composite net cloth as substrate, after copper plastic composite net cloth is carried out ultrasonic cleaning, using true Copper metal is deposited on copper plastic composite net cloth by empty vapor deposition mode, and wherein vacuum degree is 4 × 10-3Pa, vapor deposition distance are 10cm, are steamed Power generation stream is 350A, and vaporization voltage 3V, evaporation time 25min obtain composite copper foil；
(3) negative electrode slurry is coated on composite copper foil, is dried, is cold-pressed, slitting and sectioning obtain cathode Piece；
(4) soft aluminium wire and polyimide fiber silk are provided；
(5) it uses plain weave mode that soft aluminium wire and polyimide fiber silk are woven into mesh number to answer for the plastic-aluminum of 90 mesh Screen cloth is closed, central diameter silk is polyimide fiber silk, and tram is more soft aluminium wires and more polyimide fiber silk intervals It is arranged alternately；Using aluminum metal as target, using plastic-aluminum combined screen cloth as substrate, after plastic-aluminum combined screen cloth is carried out ultrasonic cleaning, Aluminum metal is deposited on plastic-aluminum combined screen cloth using magnetron sputtering mode, obtains clad aluminum foil；
(6) anode sizing agent is coated on clad aluminum foil, is dried, is cold-pressed, slitting and sectioning obtain anode Piece；
(7) negative electrode tab, polyolefin porous membrane and positive plate are wound operation, obtain battery core；
(8) battery core is placed in steel shell, injects electrolyte, then carry out chemical conversion and partial volume operation, obtain the lithium of embodiment 2 from Sub- battery.
Embodiment 3
(1) soft copper wire and polyvinylidene fluoride silk are provided；
(2) use plain weave mode that soft copper wire and polyvinylidene fluoride silk are woven into mesh number as the copper of 100 mesh Plastic composite net cloth, central diameter silk are polyvinylidene fluoride silk, and tram is more soft copper wires and more Kynoar fibres Dimension silk alternates setting；Using copper metal as target, using copper plastic composite net cloth as substrate, copper plastic composite net cloth is subjected to ultrasonic wave After cleaning, copper metal is deposited on copper plastic composite net cloth using magnetron sputtering mode, wherein sputtering power is 50W, when sputtering The air pressure of argon gas is 0.6Pa, and the flow of argon gas is 40sccm, and vacuum degree is 2.0 × 10-5Pa, sputtering time 3h are obtained compound Copper foil；
(3) negative electrode slurry is coated on composite copper foil, is dried, is cold-pressed, slitting and sectioning obtain cathode Piece；
(4) soft aluminium wire and pet fiber silk are provided；
(5) use plain weave mode by soft aluminium wire and pet fiber silk be woven into mesh number for The plastic-aluminum combined screen cloth of 100 purposes, central diameter silk are pet fiber silk, and tram is more soft aluminium wires And more pet fiber silks alternate setting；Using aluminum metal as target, it is with plastic-aluminum combined screen cloth Aluminum metal is deposited on plastic-aluminum combined net using magnetron sputtering mode after plastic-aluminum combined screen cloth is carried out ultrasonic cleaning by substrate On cloth, clad aluminum foil is obtained；
(6) anode sizing agent is coated on clad aluminum foil, is dried, is cold-pressed, slitting and sectioning obtain anode Piece；
(7) negative electrode tab, polyolefin porous membrane and positive plate are wound operation, obtain battery core；
(8) battery core is placed in steel shell, injects electrolyte, then carry out chemical conversion and partial volume operation, obtain the lithium of embodiment 3 from Sub- battery.
It is proved by experimental analysis, the lithium ion battery that 1-embodiment of embodiment 3 is prepared all has biggish electricity Tankage, higher efficiency for charge-discharge, and cyclical stability and safety are preferable, the especially more existing lithium ion battery of weight It is lighter, the 60% of only existing lithium ion battery, energy density is greatly improved.The especially lithium-ion electric of embodiment 3 The energy density highest in pond, this is because more optimize preparation process and prepare raw material while also having adjusted technological parameter, For example, soft copper wire and polyvinylidene fluoride silk are woven into copper plastic composite net cloth, central diameter silk using plain weave mode It is polyvinylidene fluoride silk, tram is that more soft copper wires and more polyvinylidene fluoride silks alternate setting, together When combine the moulding of polymer filament and the metal rigidity of copper wire, be prepared that mesh is more uniform, and stability is more Copper plastic composite net cloth high and with excellent surface flatness, conducive to subsequent better deposited copper metal to obtain electric conductivity more Good composite copper foil, while reticular structure is more advantageous to Electolyte-absorptive, while being conducive to lithium ion in inside lithium ion cell More efficient migration, and then improve the energy density of lithium ion battery.For another example, by negative electrode tab, polyolefin porous membrane and During positive plate is wound operation to obtain battery core, the length direction of negative electrode tab and the length direction of positive plate are identical, The length direction of negative electrode tab is identical as the soft length direction of copper wire, the length direction of the length direction of positive plate and soft aluminium wire It is identical, it so, it is possible to obtain the more stable battery core of structure, this is because the metal rigidity of wire inherently can be to electricity Core plays good supporting role, while being more advantageous to anode ring forming, and then bigger conducive to the subsequent capacity that has been prepared, charge and discharge Electrical efficiency is higher, and cyclical stability and safety are more preferable, and especially weight is lighter, the higher lithium ion battery of energy density.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims (10)

1. a kind of preparation method of lithium ion battery, which comprises the following steps:
Soft copper wire and the first polymer filament are provided；
The soft copper wire and first polymer filament are woven into copper plastic composite net cloth, using copper metal as target, with The copper plastic composite net cloth is substrate, and the copper metal is deposited on the copper plastic composite net cloth using physical gas-phase deposition On, obtain composite copper foil；
Negative electrode slurry is coated on the composite copper foil, is dried, is cold-pressed, slitting and sectioning obtain negative electrode tab；
Soft aluminium wire and the second polymer filament are provided；
The soft aluminium wire and second polymer filament are woven into plastic-aluminum combined screen cloth, using aluminum metal as target, with The plastic-aluminum combined screen cloth is substrate, and the aluminum metal is deposited on the plastic-aluminum combined screen cloth using physical gas-phase deposition On, obtain clad aluminum foil；
Anode sizing agent is coated on the clad aluminum foil, is dried, is cold-pressed, slitting and sectioning obtain positive plate；
The negative electrode tab, insulation diaphragm and the positive plate are wound operation, obtain battery core；
The battery core is placed in shell, electrolyte is injected, then carries out chemical conversion and partial volume operation, obtains lithium ion battery.
2. the preparation method of lithium ion battery according to claim 1, which is characterized in that first polymer filament For pet fiber silk, Fypro silk, polyimide fiber silk, polyvinylidene fluoride silk or virtue Synthetic fibre fiber filament.
3. the preparation method of lithium ion battery according to claim 1, which is characterized in that the volume of the copper plastic composite net cloth The mode knitted uses plain weave mode.
4. the preparation method of lithium ion battery according to claim 3, which is characterized in that in the copper plastic composite net cloth In plain weave mode, diameter silk is the first polymer filament, and tram is that more soft copper wires and more first macromolecules are fine Dimension silk alternates setting.
5. the preparation method of lithium ion battery according to claim 4, which is characterized in that the volume of the plastic-aluminum combined screen cloth Mode is knitted using plain weave mode.
6. the preparation method of lithium ion battery according to claim 5, which is characterized in that the plastic-aluminum combined screen cloth is put down In line weaving manner, diameter silk is the second polymer filament, and tram is more soft aluminium wires and more second macromolecular fibres Silk alternates setting.
7. the preparation method of lithium ion battery according to claim 6, which is characterized in that the length direction of the negative electrode tab It is identical as the soft length direction of copper wire.
8. the preparation method of lithium ion battery according to claim 7, which is characterized in that the length direction of the positive plate It is identical as the soft length direction of aluminium wire.
9. the preparation method of lithium ion battery according to claim 8, which is characterized in that the length side of the insulation diaphragm To identical as the length direction of the length direction of the negative electrode tab and the positive plate.
10. a kind of lithium ion battery, which is characterized in that using as described in any one of claim 1 to claim 9 lithium from The preparation method of sub- battery is prepared.
CN201810790776.6A 2018-07-18 2018-07-18 Lithium ion battery and preparation method thereof Active CN109088070B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810790776.6A CN109088070B (en) 2018-07-18 2018-07-18 Lithium ion battery and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810790776.6A CN109088070B (en) 2018-07-18 2018-07-18 Lithium ion battery and preparation method thereof

Publications (2)

Publication Number Publication Date
CN109088070A true CN109088070A (en) 2018-12-25
CN109088070B CN109088070B (en) 2020-12-08

Family

ID=64837718

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810790776.6A Active CN109088070B (en) 2018-07-18 2018-07-18 Lithium ion battery and preparation method thereof

Country Status (1)

Country Link
CN (1) CN109088070B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021051642A1 (en) * 2019-09-16 2021-03-25 超威电源集团有限公司 Lead mesh grid for lead storage battery and preparation method therefor
CN113078285A (en) * 2021-03-25 2021-07-06 中国科学院宁波材料技术与工程研究所 Flexible battery
CN113113611A (en) * 2021-03-30 2021-07-13 上海科比斯实业有限公司 Composite current collector, battery pole piece, battery core and lithium ion secondary battery

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103125038A (en) * 2010-09-22 2013-05-29 原子能与替代能源委员会 Electrode for lithium batteries and its method of manufacture
CN105378980A (en) * 2013-06-07 2016-03-02 Jenax股份有限公司 Electrode, method for manufacturing same, and battery using same
CN105493322A (en) * 2013-06-24 2016-04-13 Jenax股份有限公司 Current collector for secondary battery and electrode using same
CN105826570A (en) * 2016-03-22 2016-08-03 国家纳米科学中心 Conductive non-woven fabric and preparation method and application thereof
CN106058303A (en) * 2016-07-28 2016-10-26 广西卓能新能源科技有限公司 18650 lithium ion battery and preparation method thereof
CN106898729A (en) * 2017-03-27 2017-06-27 浙江大学 Flexible current-collecting body, electrode and battery comprising the flexible current-collecting body

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103125038A (en) * 2010-09-22 2013-05-29 原子能与替代能源委员会 Electrode for lithium batteries and its method of manufacture
CN105378980A (en) * 2013-06-07 2016-03-02 Jenax股份有限公司 Electrode, method for manufacturing same, and battery using same
CN105493322A (en) * 2013-06-24 2016-04-13 Jenax股份有限公司 Current collector for secondary battery and electrode using same
CN105826570A (en) * 2016-03-22 2016-08-03 国家纳米科学中心 Conductive non-woven fabric and preparation method and application thereof
CN106058303A (en) * 2016-07-28 2016-10-26 广西卓能新能源科技有限公司 18650 lithium ion battery and preparation method thereof
CN106898729A (en) * 2017-03-27 2017-06-27 浙江大学 Flexible current-collecting body, electrode and battery comprising the flexible current-collecting body

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021051642A1 (en) * 2019-09-16 2021-03-25 超威电源集团有限公司 Lead mesh grid for lead storage battery and preparation method therefor
CN113078285A (en) * 2021-03-25 2021-07-06 中国科学院宁波材料技术与工程研究所 Flexible battery
CN113078285B (en) * 2021-03-25 2023-01-31 中国科学院宁波材料技术与工程研究所 Flexible battery
CN113113611A (en) * 2021-03-30 2021-07-13 上海科比斯实业有限公司 Composite current collector, battery pole piece, battery core and lithium ion secondary battery

Also Published As

Publication number Publication date
CN109088070B (en) 2020-12-08

Similar Documents

Publication Publication Date Title
CN109088045B (en) Preparation method of high-energy-density lithium ion battery
CN107154499A (en) A kind of lithium battery containing new current collector and preparation method thereof
CN109792044A (en) Comprising the lithium secondary battery anode of protective layer being made of conductive fabric and comprising its lithium secondary battery
CN109088070A (en) Lithium ion battery and preparation method thereof
CN109103503B (en) Preparation method of lithium ion battery
JP2012109224A (en) Conductive nonwoven fabric and secondary battery using it
Jin et al. Vertical nanoarrays with lithiophilic sites suppress the growth of lithium dendrites for ultrastable lithium metal batteries
CN112420984A (en) Negative plate and lithium ion battery
Chang et al. Co-guiding the dendrite-free plating of lithium on lithiophilic ZnO and fluoride modified 3D porous copper for stable Li metal anode
CN115832217A (en) Metal lithium composite negative electrode for secondary battery and preparation method thereof
Hu et al. Electro-spraying/spinning: A novel battery manufacturing technology
CN105489892B (en) A kind of lithium-sulfur cell anode composite piece and preparation method thereof
CN113346192B (en) Lithium ion battery composite diaphragm and preparation method and application thereof
CN114203963A (en) Carbon material lithium metal composite negative electrode and preparation method and application thereof
CN114069154A (en) Lithium battery coating diaphragm and preparation method thereof
CN111640929B (en) Preparation method of organic-inorganic ordered SEI layer modified lithium metal and application of organic-inorganic ordered SEI layer modified lithium metal in electrochemical field
CN114122395B (en) Preparation and application of negative electrode plate for sodium ion battery
CN114639797B (en) Treatment method of negative electrode plate, sodium metal negative electrode plate and preparation device
CN115528202A (en) Composite current collector and preparation method thereof, electrode plate and battery
KR102022017B1 (en) Manufacuring method of polymer fuel cell electrode using electrospraying and polymer fuel cell electrode using the same
CN1107356C (en) Method for manufacturing lithium ion battery of plastic film
CN112310367A (en) Ultrathin porous metal material for lithium battery electrode and preparation method and application thereof
JP2023513815A (en) Anode piece, battery and electronic device employing said electrode piece
CN113471399B (en) Preparation method and application of high-conductivity Si/C nano-film
CN114335559B (en) Lithium metal battery current collector and preparation method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant