CN113422065A - Coated aluminum foil and preparation method and application thereof - Google Patents
Coated aluminum foil and preparation method and application thereof Download PDFInfo
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- CN113422065A CN113422065A CN202110713010.XA CN202110713010A CN113422065A CN 113422065 A CN113422065 A CN 113422065A CN 202110713010 A CN202110713010 A CN 202110713010A CN 113422065 A CN113422065 A CN 113422065A
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- aluminum foil
- coated aluminum
- conductive coating
- molybdenum carbide
- polyacrylonitrile
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- 239000011888 foil Substances 0.000 title claims abstract description 60
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 54
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims abstract description 39
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910039444 MoC Inorganic materials 0.000 claims abstract description 25
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 9
- 238000004381 surface treatment Methods 0.000 claims description 9
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 8
- 239000006255 coating slurry Substances 0.000 claims description 8
- 229910001416 lithium ion Inorganic materials 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000012298 atmosphere Substances 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 239000007774 positive electrode material Substances 0.000 abstract description 4
- 229910000510 noble metal Inorganic materials 0.000 abstract description 3
- 239000010405 anode material Substances 0.000 description 9
- 229910052493 LiFePO4 Inorganic materials 0.000 description 8
- 239000002131 composite material Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910010710 LiFePO Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000006256 anode slurry Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Images
Classifications
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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
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- 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
-
- 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 invention provides a coated aluminum foil and a preparation method and application thereof, wherein the coated aluminum foil comprises a conductive coating and an aluminum foil, the conductive coating is arranged on one side or two sides of the aluminum foil and comprises molybdenum carbide and polyacrylonitrile, the molybdenum carbide is added into the conductive coating of the coated aluminum foil, the electronic structure of the molybdenum carbide is similar to that of noble metal Pt, the conductive coating has excellent conductive performance and can improve the conductive performance of the carbon-coated aluminum foil, and the polyacrylonitrile can effectively improve the adhesive force between a positive electrode material and the foil, so that the high-rate charge-discharge and cycle performance of a lithium iron phosphate power battery are improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to a coated aluminum foil and a preparation method and application thereof.
Background
With societyWith rapid development of economy, modern science and technology and information industrialization, environmentally-friendly batteries and related industries play more and more important roles in high-tech industrial chains. Among the positive electrode materials for lithium ion batteries, lithium iron phosphate (LiFePO)4) The lithium ion battery anode material has the advantages of high safety, stable cycle performance, low price, stable discharge platform and environmental friendliness, and is generally considered to be the most promising lithium ion battery anode material, in particular to the power lithium ion battery anode material. Compared with other lithium ion battery anode materials, LiFePO4Safer, more environment-friendly and lower in cost. However, LiFePO4There are still fatal weaknesses: firstly, the conductivity is low, and the large-current discharge performance is poor; secondly, the tap density is low, and the battery capacity and energy density are low.
To solve the problem of LiFePO4The problem of low conductivity is that the modification treatment is best carried out. Carbon has excellent conductivity in LiFePO4In the synthesis process, doping or coating conductive carbon is a method for improving LiFePO4A simple and effective way of conducting electrical properties. However, in the carbon coating process, it is difficult to ensure the uniformity of carbon coating, which directly affects the obtained LiFePO4The properties of the material.
CN108258199A discloses a preparation method of a lithium iron phosphate composite pole piece, which comprises dissolving metal lithium in liquid nitrogen to obtain a lithium sol solution, coating the lithium sol solution on the surface of a foamed current collector, pressing, performing high-temperature treatment, coating a lithium iron phosphate slurry on the surface, drying, and performing vapor deposition on the surface to obtain a graphene layer, thereby obtaining a positive pole composite pole piece. The prepared lithium iron phosphate composite pole piece is difficult to ensure the effect of carbon coating uniformity, and the effect directly influences the obtained LiFePO4The properties of the material.
CN106356502A discloses lithium iron phosphate battery positive pole piece of high rate performance, includes: the current collector, the conductive composite material layer coated on the front surface of the current collector and the modified positive electrode material layer coated on the conductive composite material layer; the conductive composite material layer is prepared from 80-90 parts of conductive active substances, 1-4 parts of dispersing agents and 8-10 parts of first binders; the modified anode material layer is made of 80-90 parts of lithium iron phosphate, 1-10 parts of a conductive agent and 1-10 parts of a second binder. The prepared positive pole piece of the lithium iron phosphate battery has poor adhesive force and poor conductivity between a positive material and a foil.
Therefore, a method for improving adhesion between a positive electrode material and a foil and improving LiFePO was developed4The positive pole piece of the lithium iron phosphate battery is very necessary.
Disclosure of Invention
The invention aims to provide a coated aluminum foil and a preparation method and application thereof. The coating aluminum foil can improve the adhesive force between the anode material and the foil and improve the LiFePO at the same time4The conductivity of the material.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a coated aluminum foil, which comprises a conductive coating and an aluminum foil, wherein the conductive coating is arranged on one side or two sides of the aluminum foil, and comprises molybdenum carbide and polyacrylonitrile.
According to the invention, molybdenum carbide is added into the conductive coating of the coating aluminum foil, the electronic structure of the molybdenum carbide is similar to that of noble metal Pt, the molybdenum carbide has excellent conductivity, the conductivity of the carbon-coated aluminum foil can be improved, and the polyacrylonitrile can effectively improve the adhesive force between the anode material and the foil, so that the high-rate charge-discharge and cycle performance of the lithium iron phosphate power battery can be improved.
Preferably, the mass ratio of the molybdenum carbide to the polyacrylonitrile is (0.8-1.2) to 1, such as: 0.8:1, 0.9:1, 1:1, 1.1:1 or 1.2:1, etc.
Preferably, the single-sided thickness of the conductive coating is 0.5-1.5 μm, such as: 0.5 μm, 0.8 μm, 1 μm, 1.2 μm, 1.5 μm, or the like.
In a second aspect, the present invention provides a method for preparing the coated aluminum foil according to the first aspect, comprising the steps of:
(1) mixing molybdenum carbide and polyacrylonitrile, and adding a solvent to obtain conductive coating slurry;
(2) and (2) coating the conductive coating slurry obtained in the step (1) on one side or two sides of an aluminum foil, and carrying out heat treatment to obtain the coated aluminum foil.
The preparation method is simple and feasible, and the prepared coating aluminum foil can be suitable for two or more than two main nano-particle materials and has good coating effect.
Preferably, the mass ratio of the molybdenum carbide to the polyacrylonitrile in the step (1) is (0.8-1.2): 1, such as: 0.8:1, 0.9:1, 1:1, 1.1:1 or 1.2:1, etc.
Preferably, the means of mixing comprises milling.
Preferably, the solvent comprises azomethylpyrrolidone.
Preferably, the aluminum foil of step (2) is previously surface-treated.
Preferably, the surface treatment comprises a plasma surface treatment.
Preferably, the single-layer coating surface density of the coated conductive paste in the step (2) is 0.1-2 g/m2For example: 0.1g/m2、0.3g/m2、0.5g/m2、1g/m2、1.5g/m2Or 2g/m2And the like.
Preferably, the heat treatment of step (2) is dried before.
Preferably, the atmosphere of the heat treatment is an inert atmosphere.
Preferably, the temperature of the heat treatment is 300-600 ℃, for example: 300 deg.C, 350 deg.C, 400 deg.C, 450 deg.C, 500 deg.C, 550 deg.C or 600 deg.C.
Preferably, the time of the heat treatment is 2-3 h, for example: 2h, 2.2h, 2.5h, 2.8h or 3h and the like.
Preferably, the temperature rise rate of the heat treatment is 2-5 ℃/min, for example: 2 ℃/min, 3 ℃/min, 4 ℃/min or 5 ℃/min and the like.
In a third aspect, the present invention provides a positive electrode plate comprising the coated aluminum foil according to the first aspect.
In a fourth aspect, the invention provides a lithium ion battery, which comprises the positive electrode plate according to the third aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, molybdenum carbide is added into the conductive coating of the coating aluminum foil, the electronic structure of the molybdenum carbide is similar to that of noble metal Pt, the molybdenum carbide has excellent conductivity, the conductivity of the carbon-coated aluminum foil can be improved, and the polyacrylonitrile can effectively improve the adhesive force between the anode material and the foil, so that the high-rate charge-discharge and cycle performance of the lithium iron phosphate power battery can be improved.
(2) The DCR of the battery prepared by using the coated aluminum foil can reach below 1.451m omega under the state of charge (SOC) of 10%, the DCR under the SOC of 50% can reach below 1.235m omega, and the DCR under the SOC of 90% can reach below 1.304m omega.
Drawings
Fig. 1 is a graph comparing the properties of aluminum foils obtained in example 1 of the present invention and comparative example 1.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
This example provides a coated aluminum foil made by the following method:
(1) grinding and mixing molybdenum carbide and polyacrylonitrile according to the mass ratio of 1:1, and adding N-methyl pyrrolidone for dispersion to obtain conductive coating slurry;
(2) performing plasma surface treatment on the aluminum foil by adopting plasma equipment, coating the conductive coating slurry obtained in the step (1) on two sides of the aluminum foil subjected to the plasma surface treatment, wherein the thickness of a single side of the conductive coating is 1.2 mu m, and the surface density is 1.2g/m2Heating to 450 ℃ at the speed of 3 ℃/min, carrying out heat treatment for 2.5h, and cooling to room temperature to obtain the coating aluminum foil.
Example 2
This example provides a coated aluminum foil made by the following method:
(1) grinding and mixing molybdenum carbide and polyacrylonitrile according to the mass ratio of 0.9:1, and adding N-methyl pyrrolidone for dispersion to obtain conductive coating slurry;
(2) performing plasma surface treatment on the aluminum foil by adopting plasma equipment, coating the conductive coating slurry obtained in the step (1) on two sides of the aluminum foil subjected to the plasma surface treatment, wherein the thickness of a single side of the conductive coating is 1 mu m, and the surface density is 1g/m2Heating to 480 ℃ at the speed of 2.5 ℃/min, carrying out heat treatment for 2.2h, and cooling to room temperature to obtain the coating aluminum foil.
Example 3
The difference between the present example and example 1 is only that the mass ratio of molybdenum carbide and polyacrylonitrile in step (1) is 0.8:1, and the other conditions and parameters are exactly the same as those in example 1.
Example 4
The difference between the present example and example 1 is only that the mass ratio of molybdenum carbide and polyacrylonitrile in step (1) is 1.2:1, and other conditions and parameters are exactly the same as those in example 1.
Example 5
The present embodiment is different from embodiment 1 only in that the thickness of the conductive coating layer on one side in step (2) is 0.1 μm, and other conditions and parameters are completely the same as those in embodiment 1.
Example 6
The present embodiment is different from embodiment 1 only in that the conductive coating layer in step (2) has a single-side thickness of 2 μm, and other conditions and parameters are completely the same as those in embodiment 1.
Comparative example 1
This comparative example is different from example 1 only in that a plasma surface-treated aluminum foil was directly used.
And (3) performance testing:
mixing LiFePO4The anode material comprises the following components: positive electrode active component: adhesive: 80 parts of conductive agent: 10: preparing anode slurry according to the mass ratio of 10, uniformly coating the anode slurry on the aluminum foils obtained in the steps 1-6 and the comparative example 1, and performing cold pressing, punching, laminating, assembling, injecting and other processes to obtain 505070 soft package batteries；
The discharge internal resistance (DCR) and cycle performance of the prepared pouch cell were tested, and the test results are shown in table 1 and fig. 1:
TABLE 1
As can be seen from table 1, the DCR at 10% state of charge (SOC) of the battery obtained using the coated aluminum foil according to the present invention can be 1.451m Ω or less, the DCR at 50% SOC can be 1.235m Ω or less, and the DCR at 90% SOC can be 1.304m Ω or less, as can be seen from examples 1 to 6.
Compared with the embodiment 1 and the embodiment 3-4, the quality ratio of molybdenum carbide to polyacrylonitrile in the conductive coating can influence the performance of the prepared coating aluminum foil, the quality ratio of molybdenum carbide to polyacrylonitrile is controlled to be (0.8-1.2): 1, the coating aluminum foil with better performance can be prepared, if the molybdenum carbide proportion is too high, the binding force between the coating and the aluminum foil is reduced, the high-rate charge and discharge and the cycle performance of the prepared lithium iron phosphate power battery are improved, and if the molybdenum carbide proportion is too low, the conductivity of the prepared coating aluminum foil is reduced.
Compared with the examples 5 to 6, the single-sided thickness of the conductive coating can influence the performance of the prepared coated aluminum foil, and the coated aluminum foil with better performance can be prepared by controlling the single-sided thickness of the conductive coating to be 0.5 to 1.5 mu m.
Compared with the comparative example 1, the example 1 can show that the soft package battery prepared from the coated aluminum foil has better electrochemical properties and good application prospect as shown in figure 1.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The coated aluminum foil is characterized by comprising a conductive coating and an aluminum foil, wherein the conductive coating is arranged on one side or two sides of the aluminum foil and comprises molybdenum carbide and polyacrylonitrile.
2. The coated aluminum foil as claimed in claim 1, wherein the mass ratio of molybdenum carbide to polyacrylonitrile is (0.8-1.2): 1.
3. The coated aluminum foil as claimed in claim 1 or 2, wherein the conductive coating layer has a thickness of 0.5 to 1.5 μm on one side.
4. A method for manufacturing the coated aluminum foil as set forth in any one of claims 1 to 3, comprising the steps of:
(1) mixing molybdenum carbide and polyacrylonitrile, and adding a solvent to obtain conductive coating slurry;
(2) and (2) coating the conductive coating slurry obtained in the step (1) on one side or two sides of an aluminum foil, and carrying out heat treatment to obtain the coated aluminum foil.
5. The preparation method according to claim 4, wherein the mass ratio of the molybdenum carbide to the polyacrylonitrile in the step (1) is (0.8-1.2): 1;
preferably, the means of mixing comprises milling;
preferably, the solvent comprises azomethylpyrrolidone.
6. The production method according to claim 4 or 5, wherein the aluminum foil of step (2) is previously subjected to surface treatment;
preferably, the surface treatment comprises a plasma surface treatment.
7. The method according to any one of claims 4 to 6, wherein the applied electroconductive paste of step (2) has a single-layer coating areal density of 0.1 to 2g/m2。
8. The production method according to any one of claims 4 to 7, wherein the drying is performed before the heat treatment in step (2);
preferably, the atmosphere of the heat treatment is an inert atmosphere;
preferably, the temperature of the heat treatment is 300-600 ℃;
preferably, the heat treatment time is 2-3 h;
preferably, the temperature rise speed of the heat treatment is 2-5 ℃/min.
9. A positive electrode sheet comprising the coated aluminum foil according to any one of claims 1 to 3.
10. A lithium ion battery comprising the positive electrode sheet of claim 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113991080A (en) * | 2021-10-25 | 2022-01-28 | 湖北亿纬动力有限公司 | Positive electrode material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991080A (en) * | 2021-10-25 | 2022-01-28 | 湖北亿纬动力有限公司 | Positive electrode material and preparation method and application thereof |
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