CN110071291A - Power battery, negative electrode tab, cathode composite foil and preparation method thereof - Google Patents
Power battery, negative electrode tab, cathode composite foil and preparation method thereof Download PDFInfo
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- CN110071291A CN110071291A CN201910207126.9A CN201910207126A CN110071291A CN 110071291 A CN110071291 A CN 110071291A CN 201910207126 A CN201910207126 A CN 201910207126A CN 110071291 A CN110071291 A CN 110071291A
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- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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- 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
-
- 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
- H01M4/80—Porous plates, e.g. sintered carriers
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- 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
Abstract
The embodiment of the present application provides a kind of power battery, negative electrode tab, cathode composite foil and preparation method thereof, and preparation method includes: to deposit transition zone in copper foil surface；In transition layer surface carbon coating slurry；Copper foil after coating carbon pastes is heat-treated, to form conductive carbon layer on the surface of transition zone, during heat treatment, on the one hand at least partly chemical element in the transition zone spreads and is dissolved into the copper foil, on the other hand react with the carbon in the conductive carbon layer and generate carbide.Cathode composite foil made from the manufacturing method of the embodiment of the present application, the carbon in conductive carbon layer firmly " anchor " can be effectively improved the bond strength between conductive carbon layer and copper foil, reduce interfacial contact internal resistance by transition zone in copper foil surface；Furthermore the conductive carbon layer formed after heat treatment, rough surface is porous, the bond area between anode active material layer and conductive carbon layer can be significantly increased, adhesive strength is promoted, reduces interface contact resistance.
Description
Technical field
This application involves cell manufacturing techniques field more particularly to a kind of power battery, negative electrode tab, cathode composite foil and
Preparation method.
Background technique
The negative electrode tab of lithium-ion-power cell is usually that negative electrode active material is coated in copper foil surface, in gained negative electrode tab
Interface contact resistance between negative electrode active material coating and copper foil is higher, binding force is not strong.Negative electrode active material coating and copper foil
Between interface contact resistance it is high so that the internal resistance of cell is big, battery-heating is serious in the case where high current charge-discharge, limits battery
Use；And the binding force between negative electrode active material coating and copper foil is not strong, it on the one hand may in pole piece processing, transfer process
There is the phenomenon that locally even large area drops off；On the other hand living with abjection/insertion of lithium ion during charge/discharge
The volume of property substance shrinks/expands, and leads to negative material coating shedding, influences electrical property, the charge and discharge for shortening battery follow
Ring service life.
Summary of the invention
In view of this, the embodiment of the present application is intended to provide a kind of power battery, cathode that can reduce interface contact resistance
Piece, cathode composite foil and preparation method thereof.
In order to achieve the above objectives, the one side of the embodiment of the present application provides a kind of manufacturing method of cathode composite foil, packet
Include following steps:
Transition zone is deposited in copper foil surface；
In transition layer surface carbon coating slurry；
The copper foil after coating carbon pastes is heat-treated, to form conductive carbon layer on the surface of the transition zone；
In the heat treatment process, at least partly chemical element in the transition zone spreads and is dissolved into the copper foil, described
At least partly chemical element reacted with the carbon in the conductive carbon layer generate carbide.
Further, at least partly chemical element is one of following elements or a variety of in the transition zone: Zr, Al,
Ti,Cr,Ta,Nb,Ni,Si,Mn,Fe；And/or the transition zone with a thickness of 2nm~1000nm.
Further, the conductive carbon layer with a thickness of 10nm~2500nm.
Further, the manufacturing method includes: to disperse conductive carbon powder and organic resin in organic solvent and formed
The carbon pastes.
Further, the conductive carbon powder includes one of following or a variety of: graphene, carbon black, graphite powder, carbon fiber
Dimension, active carbon, carbon nanotube, carbon nanohorn and carbonaceous mesophase spherules.
Further, the organic resin includes one of following or a variety of: vinyl chloride vinyl acetate copolymerization
Resin, polyvinylpyrrolidone, urea resin, aethylis carbamas resin, epoxy resin, furane resins, phenolic resin, polytetrafluoro
Ethylene, Kynoar, polyamide, polyvinyl butyral, polyurethane resin, sucrose, acrylic resin, enester tree
Rouge, chloroethylene copolymer resin, pitch, chloroethylene copolymer resin, acrylonitrile resin, vinylacetate.
Further, the gross mass of the conductive carbon powder and the organic resin accounts for the mass percent of the carbon pastes and is
35~70%；And/or in the gross mass of the organic resin and the conductive carbon powder, the quality percentage of the conductive carbon powder
Than being 60~95%.
Further, the organic solvent includes one of following or a variety of: propylene glycol monomethyl ether, propene carbonate, carbon
Sour ethylene rouge, dimethyl carbonate, dipropyl carbonate, ethyl propyl carbonic acid ester, vinylene carbonate, carbonic acid second isopropyl ester, carbonic acid first fourth
Ester, dibutyl carbonate, ethyl butyl carbonate, methyl ethyl carbonate, diethyl carbonate, gamma-butyrolacton, N-Methyl pyrrolidone.
Further, the heat treatment are as follows: the copper foil is placed in 400 DEG C~850 DEG C of reducing atmosphere or inertia
It is handled 0.5~48 hour under atmosphere.
The second aspect of the embodiment of the present application provides a kind of cathode composite foil, and the cathode composite foil is according to above-mentioned
Cathode composite foil made from any manufacturing method.
The third aspect of the embodiment of the present application provides a kind of negative electrode tab, including anode active material layer and any of the above-described kind
Cathode composite foil, the anode active material layer coated in the cathode composite foil conductive carbon layer above.
The fourth aspect of the embodiment of the present application provides a kind of power battery, including any of the above-described kind of negative electrode tab.
Cathode composite foil made from the manufacturing method of the embodiment of the present application, the interface shape between copper foil and transition zone
At diffusion bond interface, the interface between transition zone and conductive carbon layer forms chemical bonds interface, and bond strength is high, conductive
Thus carbon in carbon-coating " anchor " can firmly can be effectively improved between conductive carbon layer and copper foil by transition zone in copper foil surface
Bond strength, reduce interfacial contact internal resistance；It, can be significant furthermore the conductive carbon layer formed after heat treatment, rough surface is porous
Increase the bond area between anode active material layer and conductive carbon layer, promotes adhesive strength, reduces interface contact resistance, so that
The internal resistance of battery substantially reduces, and improves the performance of power battery.
Detailed description of the invention
Fig. 1 is the flow chart of the manufacturing method of the cathode composite foil of one embodiment of the application；
Fig. 2 is the structural schematic diagram of the cathode composite foil of one embodiment of the application；
Fig. 3 is the structural schematic diagram of the negative electrode tab of one embodiment of the application.
Specific embodiment
It should be noted that in the absence of conflict, the technical characteristic in embodiment and embodiment in the application can
To be combined with each other, the detailed description in specific embodiment is interpreted as the explanation of the application objective, is not construed as to this
The improper restriction of application.
The cathode composite foil of the embodiment of the present application is used for power battery, such as lithium-ion-power cell, sodium ion power
Battery or potassium ion power battery.In the embodiment of the present application, carried out so that cathode composite foil is for lithium-ion-power cell as an example
Description.
The one side of the embodiment of the present application provides a kind of manufacturing method of cathode composite foil, wherein cathode composite foil
Matrix use copper foil 10, referring to Fig. 1, manufacturing method includes the following steps:
Step S1: transition zone 11 is deposited on 10 surface of copper foil.
Step S2: carbon pastes are coated on 11 surface of transition zone；
Step S3: being heat-treated the copper foil 10 after coating carbon pastes, to form conductive carbon on the surface of transition zone 11
Layer 12.In above-mentioned heat treatment process, at least partly chemical element in one side transition zone 11 is spread simultaneously into copper foil 10
Solid solution forms diffusion bond interface in the interface of transition zone 11 and copper foil 10, can so make transition zone 11 and copper foil 10
Between bond strength it is high, be not easy to peel off；In at least partly chemical element and conductive carbon layer 12 in another aspect transition zone 11
Carbon reaction generate carbide, be formed as chemical bonds interface in the interface of conductive carbon layer 12 and transition zone 11, tie
It is high to close intensity.That is, at least partly chemical element in transition zone 11 are as follows: can either be diffused into copper foil 10 and and copper foil
10 solid solutions, and the element that chemical reaction generates carbide can occur with the carbon in conductive carbon layer 12.In this way, passing through transition zone
11 are firmly combined together conductive carbon layer 12 and copper foil 10, substantially reduce interface contact resistance.
Cathode composite foil made from the manufacturing method of the embodiment of the present application, the interface between copper foil 10 and transition zone 11
Place forms diffusion bond interface, and the interface between transition zone 11 and conductive carbon layer 12 forms chemical bonds interface, in conjunction with strong
Degree is high, thus the carbon in conductive carbon layer 12 firmly " anchor " can be effectively improved and be led on 10 surface of copper foil by transition zone 11
Bond strength, reduction interfacial contact internal resistance between electrical carbon layer 12 and copper foil 10；Furthermore the conductive carbon layer formed after heat treatment
12, rough surface is porous, can significantly increase bond area between anode active material layer and conductive carbon layer 12, promoted it is Nian Jie
Intensity, reduction interface contact resistance improve the performance of power battery so that the internal resistance of battery substantially reduces.
It, can also be with it is understood that above-mentioned transition zone 11 and conductive carbon layer 12 can be formed in the single side of copper foil 10
Two-sided in copper foil 10 is respectively formed above-mentioned transition zone 11 and conductive carbon layer 12.
The material of copper foil 10 can be fine copper, be also possible to copper alloy.Copper foil 10 can be fine and close structure, 10 table of copper foil
The roughness in face is unlimited, can be smooth, is also possible to coarse；Copper foil 10 can also be porous copper foil 10, i.e. copper foil 10
There are several holes two-sided through copper foil 10 on surface.Herein with no restrictions.
Copper foil 10 with a thickness of 6 μm -20 μm, the thickness of copper foil 10 should be suitable as power battery use.
Before step S1, can also corrosion treatment be carried out to copper foil 10, can so increase the roughness on 10 surface of copper foil,
To further enhance the binding force of transition zone 11 Yu 10 surface of copper foil.
Illustratively, the corrosion treatment specifically includes:
It is taken out after copper foil 10 to be processed is impregnated the predetermined time in oxalic acid solution；
Drying copper foil 10 under inert atmosphere conditions, to prevent the oxidation of copper foil 10.
Copper foil 10 after corrosion, surface have more uniform tiny corrosion pit, can dramatically increase transition zone
11 and 10 surface of copper foil bonded area, increase binding force.
The concentration and temperature of oxalic acid solution and the predetermined time of immersion are required to control in suitable range, to take into account corruption
It loses effect and improves corrosion efficiency.In the embodiment of the present application, the mass concentration of oxalic acid solution is 4~11%, temperature is 55 DEG C~
86 DEG C, the predetermined time of immersion is 2~6 minutes.
Inert atmosphere can be the gases such as nitrogen, argon gas；Dry temperature 70 C~90 DEG C of copper foil 10, which can be simultaneous
Care for drying efficiency and energy conservation.
Transition zone 11 with a thickness of 2nm~1000nm (nanometer, nanometer), transition zone 11 is relatively thin, can satisfy transition
Connection function, thickness and quality to foil do not have too much influence again.
As long as the chemical element in transition zone 11 can be dissolved into the lattice of copper and can chemically react with carbon
, illustratively, may include one of following elements or a variety of: Zr, Al, Ti, Cr, Ta, Nb, Ni, Si, Mn, Fe.
The method for depositing transition zone 11 is unlimited, such as the side such as can be magnetron sputtering, ion plating, plasma gas phase deposition
Method.
Manufacturing method further include: disperse conductive carbon powder and organic resin in organic solvent and form above-mentioned carbon pastes.It leads
Electrical carbon powder refers to capableing of conductive carbonaceous material, and illustratively, conductive carbon powder includes one of llowing group of materials or a variety of: stone
Black alkene, carbon black, graphite powder, carbon fiber, active carbon, carbon nanotube, carbon nanohorn and carbonaceous mesophase spherules.
Above-mentioned organic resin can be pyrolyzed after heat treatment as activated carbon, since the activity of the activated carbon of pyrolysis is higher,
Therefore during heat treatment, chemical reaction generation carbon can preferably occur with the above-mentioned chemical element in transition zone for activated carbon
Compound.Illustratively, which includes one of following or a variety of: the resin of vinyl chloride vinyl acetate copolymerization,
Polyvinylpyrrolidone, urea resin, aethylis carbamas resin, epoxy resin, furane resins, phenolic resin, polytetrafluoroethylene (PTFE),
Kynoar, polyamide, polyvinyl butyral, polyurethane resin, sucrose, acrylic resin, enester resin, chloroethene
Alkene copolymer resins, pitch, chloroethylene copolymer resin, acrylonitrile resin, vinylacetate.
Illustratively, organic solvent includes one of following or a variety of: propylene glycol monomethyl ether, propene carbonate, carbonic acid second
Alkene rouge, dimethyl carbonate, dipropyl carbonate, ethyl propyl carbonic acid ester, vinylene carbonate, carbonic acid second isopropyl ester, carbonic acid first butyl ester, carbon
Dibutyl phthalate, ethyl butyl carbonate, methyl ethyl carbonate, diethyl carbonate, gamma-butyrolacton, N-Methyl pyrrolidone.
In above-mentioned carbon pastes, the gross mass of conductive carbon powder and organic resin account for carbon pastes mass percent be 35~
70%, surplus is organic solvent, so that conductive carbon powder and organic resin can be mixed sufficiently and uniformly in organic solvent
It closes.Further, in the gross mass of conductive carbon powder and organic resin, the mass percent of conductive carbon powder is 60~95%, surplus
For organic resin, that is to say, that the weight of conductive carbon powder accounts for the 60~95% of organic resin and conductive carbon powder gross mass, to guarantee
Conductive carbon powder occupies higher ratio, reduces the influence that organic resin is pyrolyzed the active carbon butt to be formed electric shock resistance.
Above-mentioned carbon pastes can be coated on 11 surface of transition zone by the modes such as brushing, spraying.
In the embodiment of the present application, upon step s 2, before step S3, can also to be coated with carbon pastes copper foil 10 into
Row is dried.So in order to make evaporating in carbon pastes before being transferred to heat treatment, prevent carbon pastes random
It flows and leads to carbon pastes coating became uneven.Illustratively, dry condition are as follows: the condition for being 80 DEG C~150 DEG C in temperature
Lower forced air drying 0.2~0.75 hour.
Above-mentioned heat treatment are as follows: the copper foil for being coated with carbon pastes is placed in 400 DEG C~850 DEG C of reducing atmosphere or inertia
It is handled 0.5~48 hour under atmosphere.Under the conditions of the temperature and time, the chemical element and carbon in transition zone 11 can be taken into account
Chemical reaction, can also make the chemical element in transition zone 11 sufficiently spread and be dissolved into copper foil 10.The conductive carbon of generation
Layer with a thickness of 10nm~2500nm.
Specific embodiment:
One, corrosion treatment
The oxalic acid solution that configuration quality concentration is 7% will be with a thickness of 10 μm (micron) by oxalic acid solution by heat to 65 DEG C
Copper foil 10 is soaked in above-mentioned oxalic acid solution and at the uniform velocity tethered sliding passes through, and is controlled processing time of the copper foil 10 in acid solution and is
5 minutes, then copper foil 10 is taken out and is dried under 80 DEG C or so, nitrogen atmosphere protection.
Two, transition zone is deposited
Transition zone 11 is deposited on the two sides of copper foil 10 using magnetically controlled sputter method, target selects metal Ti target, transition thickness
Degree is 150nm.
Three, carbon pastes are configured
Graphite powder and epoxy resin are stirred into propylene glycol monomethyl ether, the mass ratio of graphite powder and epoxy resin is 3:
1, the mass percent that the gross mass of graphite powder and epoxy resin accounts for carbon pastes is 50%, 1000 rpms of mixing speed, is stirred
Mixing incorporation time is 3 hours.
Four, carbon pastes are coated
By above-mentioned carbon pastes brushing on the surface of the transition zone 11 of 10 one side of copper foil, same painting way is then taken to apply
Overlay on the surface of 10 another side transition zone 11 of copper foil.
Five, it is heat-treated
By the copper foil 10 after coating carbon pastes in N2800 DEG C of temperature are heated under gas atmosphere, wherein copper foil 10 is in high temperature
400 DEG C of region or more when it is 12 hours a length of, generate conductive carbon layer with a thickness of 800nm.
The second aspect of the embodiment of the present application provides a kind of cathode composite foil, referring to Fig. 2, the cathode composite foil packet
Copper foil 10, transition zone 11 and conductive carbon layer 12 are included, transition zone 11 is between copper foil 10 and conductive carbon layer 12, in transition zone 11
At least partly chemical element to copper foil 10 spread and be dissolved, at least partly chemical element and conductive carbon in the transition zone 11
Carbon in layer 12 occurs chemical reaction and generates carbide.
Illustratively, which is the cathode composite foil according to made from any of the above-described kind of manufacturing method.
The third aspect of the embodiment of the present application provides a kind of negative electrode tab, referring to Fig. 3, the negative electrode tab includes above-mentioned cathode
Composite foil and anode active material layer 13 coated on 12 surface of conductive carbon layer.Conductive carbon layer 12 can significantly reduce cathode
The interface contact resistance of active material layer 13 and copper foil 10, and increase the adhesive force of anode active material layer 13.
The fourth aspect of the embodiment of the present application provides a kind of power battery, which includes above-mentioned negative electrode tab.It should
Power battery can be lithium ion battery.
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (12)
1. the manufacturing method of cathode composite foil, which comprises the following steps:
Transition zone is deposited in copper foil surface；
In transition layer surface carbon coating slurry；
The copper foil after coating carbon pastes is heat-treated, to form conductive carbon layer on the surface of the transition zone；Institute
State in heat treatment process, at least partly chemical element in the transition zone spreads and is dissolved into the copper foil, it is described extremely
Small part chemical element is reacted with the carbon in the conductive carbon layer generates carbide.
2. the manufacturing method according to claim 1, which is characterized in that at least partly chemical element in the transition zone is
One of following elements are a variety of: Zr, Al, Ti, Cr, Ta, Nb, Ni, Si, Mn, Fe；And/or the transition zone with a thickness of
2nm~1000nm.
3. the manufacturing method according to claim 1, which is characterized in that the conductive carbon layer with a thickness of 10nm~
2500nm。
4. the manufacturing method according to claim 1, which is characterized in that the manufacturing method further include:
It disperses conductive carbon powder and organic resin in organic solvent and forms the carbon pastes.
5. manufacturing method according to claim 4, which is characterized in that the conductive carbon powder includes one of following or more
Kind: graphene, carbon black, graphite powder, carbon fiber, active carbon, carbon nanotube, carbon nanohorn and carbonaceous mesophase spherules.
6. manufacturing method according to claim 4, which is characterized in that the organic resin includes one of following or more
Kind: resin, polyvinylpyrrolidone, urea resin, the aethylis carbamas resin, asphalt mixtures modified by epoxy resin of vinyl chloride vinyl acetate copolymerization
Rouge, furane resins, phenolic resin, polytetrafluoroethylene (PTFE), Kynoar, polyamide, polyvinyl butyral, polyurethane tree
Rouge, sucrose, acrylic resin, enester resin, chloroethylene copolymer resin, pitch, chloroethylene copolymer resin, acrylonitrile resin, vinegar
Vinyl acetate.
7. manufacturing method according to claim 4, which is characterized in that total matter of the conductive carbon powder and the organic resin
The mass percent that amount accounts for the carbon pastes is 35~70%；And/or total matter in the organic resin and the conductive carbon powder
In amount, the mass percent of the conductive carbon powder is 60~95%.
8. manufacturing method according to claim 4, which is characterized in that the organic solvent includes one of following or more
Kind: propylene glycol monomethyl ether, propene carbonate, ethylene carbonate, dimethyl carbonate, dipropyl carbonate, ethyl propyl carbonic acid ester, carbonic acid Asia second
Enester, carbonic acid second isopropyl ester, carbonic acid first butyl ester, dibutyl carbonate, ethyl butyl carbonate, methyl ethyl carbonate, diethyl carbonate, γ-
Butyrolactone, N-Methyl pyrrolidone.
9. the manufacturing method according to claim 1, which is characterized in that the heat treatment are as follows: the copper foil is placed in 400
DEG C~850 DEG C of reducing atmosphere or inert atmosphere under handle 0.5~48 hour.
10. cathode composite foil, which is characterized in that the cathode composite foil is according to any one of the claim 1-9 system
Make cathode composite foil made from method.
11. a kind of negative electrode tab, which is characterized in that including anode active material layer and cathode composite insulating foil described in any one of claim 10
Material, the anode active material layer are coated in above the conductive carbon layer of the cathode composite foil.
12. a kind of power battery, which is characterized in that including the negative electrode tab described in claim 11.
Priority Applications (1)
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| CN201910207126.9A CN110071291A (en) | 2019-03-19 | 2019-03-19 | Power battery, negative electrode tab, cathode composite foil and preparation method thereof |
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| CN201910207126.9A CN110071291A (en) | 2019-03-19 | 2019-03-19 | Power battery, negative electrode tab, cathode composite foil and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038631A (en) * | 2020-09-03 | 2020-12-04 | 青海凯金新能源材料有限公司 | Lithium battery electrode plate with surface coated with natural graphite and processing technology thereof |
| CN116417621A (en) * | 2023-06-12 | 2023-07-11 | 广州方邦电子股份有限公司 | Composite foil, battery pole piece and battery |
| CN116417621B (en) * | 2023-06-12 | 2023-09-05 | 广州方邦电子股份有限公司 | Composite foil, battery pole piece and battery |
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