CN113675401A - Laminated lithium ion battery and negative pole piece thereof - Google Patents
Laminated lithium ion battery and negative pole piece thereof Download PDFInfo
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- CN113675401A CN113675401A CN202110788789.1A CN202110788789A CN113675401A CN 113675401 A CN113675401 A CN 113675401A CN 202110788789 A CN202110788789 A CN 202110788789A CN 113675401 A CN113675401 A CN 113675401A
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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
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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
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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
- H01M2200/00—Safety devices for primary or secondary batteries
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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
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
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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
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/30—Preventing polarity reversal
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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
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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
- 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
The invention discloses a laminated lithium ion battery and a negative pole piece thereof. The negative pole piece comprises a negative current collector layer and negative active material layers coated on two sides of the negative current collector layer, the outer sides of the negative active material layers on two sides are respectively provided with a ceramic coating, the outer sides of the ceramic coatings on two sides are respectively provided with a high polymer microporous layer, and the outer sides of the high polymer microporous layers on two sides are respectively provided with a polyvinylidene fluoride coating. The negative pole piece and the positive pole piece of the laminated lithium ion battery are laminated to form a bare cell of the lithium ion battery, and the polyvinylidene fluoride coating is directly bonded with the positive pole piece after hot melting through the hot-cold pressing process, so that short circuit between the positive pole piece and the negative pole piece caused by dislocation of the positive pole piece and the negative pole piece in the turnover and subsequent assembly of the cell is effectively avoided.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a negative pole piece of a laminated lithium ion battery and the laminated lithium ion battery.
Background
Lithium ion batteries have the advantages of high energy density, long cycle life, environmental protection, etc., have taken up an important position in the energy storage device market, and are applied to various portable mobile devices, such as: mobile phones, cameras, notebook computers, and the like are also being gradually applied to large electric devices such as electric bicycles (E-bike), Hybrid Electric Vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and pure Electric Vehicles (EV).
Along with the continuous extension of the application field of the lithium ion battery, the safety performance of the lithium ion battery is also paid more and more attention, and the traditional lamination type manufacturing is that a positive pole piece, a negative pole piece and a diaphragm which are to be cut are stacked in a certain order to manufacture a battery cell. In the battery core manufactured by the method, the positive and negative pole pieces are easy to have dislocation in the assembly turnover and tab welding process, and an X-ray inspection procedure is usually added for screening after the assembly of the battery core is finished, so that the production efficiency of the battery is greatly reduced, and meanwhile, the missing judgment can also occur, and even safety accidents are caused.
For example, the utility model with the authorization bulletin number of CN211045593U discloses an elastic layered silicon-based negative electrode plate and a lithium battery comprising the same, wherein the elastic layered silicon-based negative electrode plate sequentially comprises a graphite negative electrode material outer layer, a silicon-based negative electrode material inner layer, a porous copper foil current collector, a silicon-based negative electrode material inner layer and a graphite negative electrode material outer layer from one side to the other side; the porous copper foil current collector is obtained by coating porous copper foils on two sides of a PET film substrate. The lithium battery comprises a positive pole piece, a negative pole piece and a diaphragm positioned between the positive pole piece and the negative pole piece; the negative pole piece is the elastic layered silicon-based negative pole piece.
For example, the invention with publication number CN107039633A discloses a composite negative electrode plate of a high specific energy lithium ion battery, which presents a layered structure and sequentially comprises a reticular copper foil current collector (1), an active material layer (2) coated on the surface of the reticular current collector, a reticular pre-coated lithium layer (3) and a protective layer (4) sprayed on the outermost layer from inside to outside, and is characterized in that: the porosity of the reticular copper foil current collector (1) is 40-60%, the mesh shape is circular or rhombic, and the thickness is 10-30 mu m.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a negative pole piece of a laminated lithium ion battery and the laminated lithium ion battery.
The utility model provides a negative pole piece of lamination formula lithium ion battery, includes negative pole current collector layer and coats in the negative pole active material layer of negative pole current collector layer both sides, still is equipped with one deck ceramic coating respectively in the outside of the negative pole active material layer of both sides, still is equipped with one deck high molecular polymer micropore layer respectively in the ceramic coating's of both sides outside, still is equipped with one deck polyvinylidene fluoride class coating respectively in the high molecular polymer micropore layer's of both sides outside.
Preferably, the thickness of each ceramic coating is 2-5 μm; the thickness of each high molecular polymer microporous layer is 16-20 mu m; the thickness of each polyvinylidene fluoride coating layer is 2-6 mu m.
Preferably, the polyvinylidene fluoride coating is at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyvinylidene fluoride-hexafluoropropylene or polyacrylonitrile.
Preferably, the ceramic coating comprises a ceramic material and a first binder, wherein the ceramic material is at least one of oxide, nitride or carbide of four elements of aluminum, titanium, barium or silicon. More preferably, the first binder is at least one of polyvinylidene fluoride, sodium carboxymethylcellulose, styrene butadiene rubber, polyacrylonitrile or polyacrylic acid.
Preferably, the components of the microporous layer include a high molecular polymer material and a second binder, and the high molecular polymer material is at least one of polyethylene, polypropylene, polystyrene or polyvinyl chloride. More preferably, the second binder is at least one of polyvinylidene fluoride, sodium carboxymethylcellulose, styrene butadiene rubber, polyacrylonitrile or polyacrylic acid.
The invention also provides a laminated lithium ion battery, which comprises a positive pole piece and a negative pole piece which are sequentially stacked, wherein the negative pole piece uses the negative pole piece of the invention, when in assembly, a plurality of positive pole pieces and negative pole pieces are sequentially stacked, and then the positive pole piece and the negative pole piece are bonded through a polyvinylidene fluoride coating on the negative pole piece by hot and cold pressing. Preferably, the hot pressing temperature is 70-90 ℃ during hot and cold pressing.
The negative pole piece and the positive pole piece of the laminated lithium ion battery are laminated to form a bare cell of the lithium ion battery, and the polyvinylidene fluoride coating is directly bonded with the positive pole piece after hot melting through the hot-cold pressing process, so that short circuit between the positive pole piece and the negative pole piece caused by dislocation of the positive pole piece and the negative pole piece in the turnover and subsequent assembly of the cell is effectively avoided.
The microporous layer of the high molecular polymer mainly has the functions of ion conduction and electronic insulation, provides a lithium ion channel in the charging and discharging process, and is heated and melted at the temperature of 180 ℃ along with the temperature rise, so that the ion channel is cut off, and the safety of the lithium ion battery is ensured. The ceramic coating is made of an insulating material, so that the positive pole piece and the negative pole piece in the lithium ion battery can be directly attached without using a diaphragm, and the volume energy density of the lithium ion battery is favorably improved; in addition, the ceramic coating has certain strength, and can prevent lithium dendrite generated in the use process of the lithium ion battery from directly penetrating through the microporous layer of the high molecular polymer, so that the safety performance of the battery is improved.
Drawings
Fig. 1 is a schematic structural diagram of a positive electrode plate.
Fig. 2 is a schematic structural diagram of the negative electrode tab.
Fig. 3 is a schematic cross-sectional structure diagram of the positive electrode sheet.
Fig. 4 is a schematic cross-sectional structure diagram of the negative electrode tab.
A positive electrode tab 101; a negative pole piece 102; a positive electrode current collector layer 1; positive electrode active material layers 21 and 22; a negative current collector layer 3; the negative electrode active material layers 41, 42; ceramic coatings 51, 52; high molecular polymer microporous layers 61, 62; polyvinylidene fluoride-based coatings 71, 72.
Detailed Description
As shown in fig. 1 and 3, a positive electrode sheet 101 of a laminated lithium ion battery, the positive electrode sheet 101 sequentially includes a positive current collector layer 1, and a positive active material layer 21 and a positive active material layer 22 coated on two sides of the positive current collector layer 1. The specific kind of the positive electrode active material used for the positive electrode active material layer is not particularly limited. The positive active material can be one or more selected from lithium cobaltate, lithium nickel cobalt manganese oxide, lithium iron phosphate and lithium manganese oxide.
As shown in fig. 2 and 4, the negative electrode sheet 102 of the laminated lithium ion battery includes a negative electrode current collector layer 3, and a negative electrode active material layer 41 and a negative electrode active material layer 42 coated on both sides of the negative electrode current collector layer 3, and the outer sides of the negative electrode active material layers on both sides are also respectively provided with a ceramic coating, that is, the outer side of the negative electrode active material layer 41 is provided with a ceramic coating 51, and the outer side of the negative electrode active material layer 42 is provided with a ceramic coating 52. The outer sides of the ceramic coatings on both sides are respectively provided with a high molecular polymer microporous layer, namely, the outer side of the ceramic coating 51 is provided with a high molecular polymer microporous layer 61, and the outer side of the ceramic coating 52 is provided with a high molecular polymer microporous layer 62. The outer sides of the high molecular polymer microporous layers on the two sides are respectively provided with a polyvinylidene fluoride coating, namely, the outer side of the high molecular polymer microporous layer 61 is provided with a polyvinylidene fluoride coating 71, and the outer side of the high molecular polymer microporous layer 62 is provided with a polyvinylidene fluoride coating 72.
The specific kind of the negative electrode active material used in the negative electrode active material layer is not particularly limited, and the negative electrode active material may be one or more selected from artificial graphite, natural graphite, hard carbon, soft carbon, a silicon-carbon composite material, or a silicon alloy.
The ceramic coating 51 and the ceramic coating 52 each independently include a ceramic material selected from at least one of oxides, nitrides, and carbides of aluminum (Al), titanium (Ti), barium (Ba), and silicon (Si), and a first binder; the ceramic coating is made of an insulating material, so that the positive and negative pole pieces in the lithium ion battery can be directly attached without using a diaphragm, and the volume energy density of the battery is favorably improved; in addition, the ceramic coating has certain strength, and can prevent lithium dendrite generated in the use process of the lithium ion battery from directly penetrating through the microporous layer of the high molecular polymer, so that the safety performance of the battery is improved. The thickness of each ceramic coating is 2-5 μm, such as 2 μm, 3 μm, 4 μm, 5 μm, etc. It was found in the studies that if the thickness of the ceramic coating layer 51 or 52 is too small, the magnitude of improvement in the safety of the battery is reduced; if the thickness of the ceramic coating 51 or 52 is too large, the cycle, rate, etc. of the battery are affected.
The components of the microporous layers 61 and 62 include a high molecular polymer material and a second binder, and the high molecular polymer material is at least one of polyethylene, polypropylene, polystyrene or polyvinyl chloride. The microporous layer of the high molecular polymer on each side can be a single layer or a composite layer obtained by superposing two or more layers. The polymer microporous layers 61 and 62 have a thickness of 16 to 20 μm, for example, 16 μm or 20 μm. The high polymer material has a proper melting point, can be timely melted to form an insulating partition when the battery is overheated, and ensures the safety of the battery.
The polyvinylidene fluoride-based coating layers 71 and 72 are formed of at least one of polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), and Polyacrylonitrile (PAN) as a polyvinylidene fluoride-based material. The thickness of each polyvinylidene fluoride coating layer is 2-6 μm, such as 2 μm, 4 μm, 6 μm, etc. After the lamination of the battery cell is finished, the polyvinylidene fluoride coatings 71 and 72 are directly bonded with the positive pole piece after hot and cold pressing at 70-90 ℃, so that short circuit between the positive pole piece and the negative pole piece caused by dislocation of the positive pole piece and the negative pole piece in circulation and subsequent assembly of the battery cell is effectively avoided. In the research, the fact that if the thicknesses of the polyvinylidene fluoride coatings 71 and 72 are too small can cause poor adhesion effect of the bare cell after hot and cold pressing, and effective adhesion cannot be guaranteed; if the thickness of the polyvinylidene fluoride coating layers 71, 72 is too large, the cycle performance, rate performance, etc. of the battery are affected.
The first binder and the second binder are both at least one of polyvinylidene fluoride (PVDF), sodium carboxymethylcellulose (CMC), Styrene Butadiene Rubber (SBR), Polyacrylonitrile (PAN) or polyacrylic acid (PAA). The binder functions to bind as long as it can achieve this function, so the addition ratio can be determined by trial and error according to the actual situation.
The invention also provides a laminated lithium ion battery which comprises a positive pole piece 101 and a negative pole piece 102 which are sequentially stacked, wherein during assembly, the positive pole piece 101 and the negative pole piece 102 are sequentially stacked, and then the positive pole piece 101 and the negative pole piece 102 are bonded through polyvinylidene fluoride coatings 71 and 72 on the negative pole piece 102 through hot and cold pressing. The hot pressing temperature is 70-90 ℃ during hot and cold pressing.
In addition, it should be noted that the lithium ion battery does not include a separator, but includes components or structures such as an electrolyte and a package case, and the electrolyte and the package case may be of existing mature designs, which are not described herein again.
In another aspect of the present invention, the present invention provides a method for preparing the above lithium ion battery, comprising the steps of:
(1) manufacture of positive pole piece
Mixing a positive active material, a conductive agent, a binder and a solvent to obtain positive active material slurry; and coating the positive active material slurry on two sides of the positive current collector layer, and drying to obtain the positive pole piece.
(2) Manufacture of negative pole piece
Uniformly mixing a negative active material, a conductive agent, a binder and deionized water to obtain negative active material slurry;
uniformly mixing a ceramic material, a binder and deionized water to obtain ceramic slurry;
mixing a high molecular polymer material, a binder and a solvent to obtain high molecular polymer slurry;
uniformly mixing a polyvinylidene fluoride material with water to obtain polyvinylidene fluoride slurry;
coating the negative electrode active material slurry on two sides of a negative electrode current collector layer, and drying to form a negative electrode active material layer;
coating the ceramic slurry on the outer side of the negative electrode active material layer, and drying to form a ceramic coating;
coating the high molecular polymer slurry on the outer side of the ceramic coating, and drying to form a high molecular polymer microporous layer;
and (3) coating the polyvinylidene fluoride slurry on the outer side of the high-molecular polymer microporous layer in a spraying mode, and drying to form a polyvinylidene fluoride coating to obtain the negative pole piece.
(3) Alternately laminating a plurality of positive pole pieces and negative pole pieces together to obtain a bare cell; and (3) after the bare cell is subjected to hot and cold pressing at 70-90 ℃, the positive and negative pole pieces are completely adhered, and then packaging and liquid injection are carried out to obtain the lithium ion battery.
Example 1
(1) Preparing a positive plate: mixing a positive active material nickel cobalt lithium manganate (NCM622), a positive conductive agent conductive carbon black (Super P) and a binder polyvinylidene fluoride (PVDF) according to the weight ratio of NCM622, Super P and PVDF being 96.3: 1.5: 2.2, adding a solvent N-methylpyrrolidone (NMP), and uniformly stirring under the action of a vacuum stirrer to obtain positive active substance slurry; and respectively and uniformly coating the positive electrode slurry on the surface of an aluminum foil of a positive electrode current collector with the thickness of 16 mu m, drying at 110 ℃ for 6 hours, rolling, and cutting into corresponding specifications to obtain the positive electrode plate.
(2) Preparing a negative plate: mixing artificial graphite serving as a negative active material, conductive carbon black SP serving as a negative conductive agent, a binder CMC and a binder SBR according to the weight ratio of graphite to SP to CMC to SBR of 95.2 to 1.1 to 1.5 to 2.2, adding deionized water, and uniformly stirring under the action of a vacuum stirrer to obtain negative active material slurry; respectively and uniformly coating the negative active material slurry on the surface of a copper foil of a negative current collector with the diameter of 8 mu m, and drying for 6 hours at the temperature of 85 ℃;
further, mixing boehmite gamma-AlOOH, a binder CMC and a binder SBR according to the weight ratio of gamma-AlOOH to CMC to SBR of 96: 1.5: 2.5, adding deionized water, uniformly stirring under the action of a vacuum stirrer to obtain ceramic slurry with the solid content of 40 wt% and the viscosity of 300mPa & s, uniformly coating the ceramic slurry on two sides of the negative electrode active material layer, and drying at 85 ℃ for 4 hours, wherein the thickness of the ceramic coating is controlled to be 2 mu m;
further, mixing the high molecular polymer Polyethylene (PE) and the binder SBR according to the weight ratio of the high molecular polymer to the binder of 85: 15, adding deionized water, and uniformly stirring to obtain high molecular polymer slurry with the solid content of 15 wt% and the viscosity of 350mPa & s; uniformly coating the high molecular polymer slurry on two sides of the ceramic coating, and drying at 85 ℃ for 4h, wherein the thickness of the high molecular polymer microporous layer is controlled at 16 mu m;
further, mixing polyvinylidene fluoride PVDF and SBR as a binder according to the weight ratio of 90: 10, adding deionized water, and uniformly stirring to obtain polyvinylidene fluoride PVDF slurry with the solid content of 20 wt% and the viscosity of 400mPa & s; uniformly spraying polyvinylidene fluoride (PVDF) slurry on two sides of the high polymer coating, and drying at 70-85 deg.C for 6h, wherein the thickness of the PVDF coating is controlled at 2 μm; and rolling, and cutting into corresponding specifications to obtain the negative pole piece.
(3) Preparing a lithium ion battery: and (3) alternately laminating the obtained positive pole piece and the negative pole piece to obtain a naked battery cell, directly adhering the naked battery cell to the positive pole piece after hot cold pressing at 70-90 ℃ after lamination is finished, ensuring that the positive pole and the negative pole are in close contact, then ultrasonically welding positive and negative pole lugs, and adopting the procedures of aluminum plastic film packaging, battery cell baking, liquid injection, aging, formation, capacity grading and the like to finish the preparation of the lithium ion battery.
Example 2
A lithium ion battery was produced in substantially the same manner as in example 1, except that the thickness of the ceramic coating in step (2) was controlled to 4 μm.
Example 3
A lithium ion battery was produced in substantially the same manner as in example 1, except that the thickness of the ceramic coating in step (2) was controlled to be 5 μm.
Example 4
A lithium ion battery was fabricated in the same manner as in example 1, except that the thickness of the microporous layer of the high molecular polymer in step (2) was controlled to 20 μm.
Example 5
A lithium ion battery was fabricated in substantially the same manner as in example 1, except that the thickness of the polyvinylidene fluoride-based coating layer in step (2) was controlled to 4 μm.
Example 6
A lithium ion battery was fabricated in substantially the same manner as in example 1, except that the thickness of the polyvinylidene fluoride-based coating layer in step (2) was controlled to 6 μm.
Comparative example 1
A lithium ion battery was prepared in substantially the same manner as in example 1, except that the ceramic coating, the high molecular polymer coating, and the polyvinylidene fluoride coating in step (2) were omitted, and a 16 μm PE separator was additionally provided between the positive electrode sheet and the negative electrode sheet in step (3).
Test example 1
The lithium ion batteries prepared in the embodiments 1-6 and the comparative example 1 are subjected to relevant tests, the test standards refer to GB/T31485-2015 and GB/T31486-2015, and the test results are shown in Table 1.
TABLE 1 test results
The test results show that the lithium ion batteries of the embodiments 1 to 6 of the invention have low dislocation defect rate and show good safety in the aspects of heating, overcharging, extruding and needling. The comparative example 1 battery has no ceramic coating or polyvinylidene fluoride coating, can not ensure poor assembly dislocation, and can not pass over-charging and needling tests, because the diaphragm can not effectively reduce the size of a needling short circuit point, the short circuit of the positive electrode and the negative electrode can be effectively isolated.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. The utility model provides a negative pole piece of lamination formula lithium ion battery, includes negative pole current collector layer and coats in the negative pole active material layer of negative pole current collector layer both sides, its characterized in that still is equipped with a layer ceramic coating respectively in the outside of the negative pole active material layer of both sides, still is equipped with one deck high molecular polymer micropore layer respectively in the ceramic coating's of both sides outside, still is equipped with one deck polyvinylidene fluoride class coating respectively in the high molecular polymer micropore layer's of both sides outside.
2. The negative electrode plate of claim 1, wherein the thickness of each ceramic coating is 2-5 μm; the thickness of each high molecular polymer microporous layer is 16-20 mu m; the thickness of each polyvinylidene fluoride coating layer is 2-6 mu m.
3. The negative electrode tab of claim 1, wherein the polyvinylidene fluoride-based coating is at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyvinylidene fluoride-hexafluoropropylene, or polyacrylonitrile.
4. The negative electrode tab of claim 1, wherein the ceramic coating comprises a ceramic material and a first binder,
the ceramic material is at least one of oxide, nitride or carbide of four elements of aluminum, titanium, barium or silicon.
5. The negative electrode tab of claim 4, wherein the first binder is at least one of polyvinylidene fluoride, sodium carboxymethylcellulose, styrene butadiene rubber, polyacrylonitrile, or polyacrylic acid.
6. The negative electrode tab of claim 1, wherein the composition of the microporous layer of high molecular polymer comprises a high molecular polymer material and a second binder,
the high molecular polymer material is at least one of polyethylene, polypropylene, polystyrene or polyvinyl chloride.
7. The negative electrode tab of claim 6, wherein the second binder is at least one of polyvinylidene fluoride, sodium carboxymethylcellulose, styrene butadiene rubber, polyacrylonitrile, or polyacrylic acid.
8. A laminated lithium ion battery comprises a positive pole piece and a negative pole piece which are sequentially stacked, and is characterized in that the negative pole piece uses the negative pole piece in any one of claims 1-7, during assembly, a plurality of positive pole pieces and a plurality of negative pole pieces are sequentially stacked, and then the positive pole piece and the negative pole piece are bonded through a polyvinylidene fluoride coating on the negative pole piece through hot cold pressing.
9. The laminated lithium ion battery according to claim 8, wherein the hot pressing temperature is 70-90 ℃ during hot and cold pressing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114156522A (en) * | 2021-12-02 | 2022-03-08 | 天津市捷威动力工业有限公司 | Hot-pressing compounding process of low-internal-resistance and high-magnification VDA 590 model soft-package battery cell |
| CN114388733A (en) * | 2021-12-28 | 2022-04-22 | 东莞维科电池有限公司 | Lithium ion battery electrode structure, preparation method and lithium ion battery comprising same |
| WO2024061512A1 (en) * | 2022-09-20 | 2024-03-28 | Volkswagen Aktiengesellschaft | Method for producing a rechargeable battery, and rechargeable battery |
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