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Electrode plate and lithium ion battery comprising same

An electrode sheet and negative electrode technology, applied in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problems of not requiring extensibility, deterioration of electrical properties, etc., to avoid short circuits and improve acupuncture safety. Effect

Active Publication Date: 2022-02-11
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The functional coating includes a first coating and a second coating, wherein the first coating can solve the problem of deterioration of electrical properties due to the slurry of electronic insulation properties in the second coating wrapping the pole piece active material, At the same time, the first coating does not require extensibility, so after the first coating is applied, the pole piece can be compacted twice to eliminate the rebound problem of the pole piece caused by the direct coating of the slurry on the surface of the pole piece; and the second Due to its electronic insulation and high elongation, the coating can greatly reduce or even avoid the short circuit area between the positive and negative electrodes when the battery is pierced by foreign objects, thereby greatly improving the safety of the battery

Method used

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  • Electrode plate and lithium ion battery comprising same
  • Electrode plate and lithium ion battery comprising same
  • Electrode plate and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Preparation of positive electrode sheet containing double-layer coating:

[0058] 1) Mix NCM high-nickel 8-series positive electrode (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) at a mass ratio of 97:1.5:1.5 to make positive electrode slurry Material, the positive electrode slurry is coated on both surfaces of the current collector aluminum foil, dried at 100°C to form a positive electrode active material layer, and then cold pressed to obtain a positive electrode sheet containing an active material layer;

[0059] 2) Dissolving the first polymer polyacrylonitrile, the first plasticizer polyvinyl carbonate, and the conductive agent acetylene black in the organic solvent N,N-dimethylacetamide (DMAC) at a mass ratio of 50:10:40 , mix uniformly to make the first coating slurry, apply the first coating slurry on the surface of the positive electrode active material layer in step 1), and...

Embodiment 2

[0069] 1. Preparation of positive electrode sheet containing double-layer coating:

[0070] 1) Mix NCM high-nickel 8-series positive electrode (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) at a mass ratio of 97:1.5:1.5 to make positive electrode slurry Material, the positive electrode slurry is coated on both surfaces of the current collector aluminum foil, dried at 100°C to form a positive electrode active material layer, and then cold pressed to obtain a positive electrode sheet containing an active material layer;

[0071] 2) Dissolve the first polymer polyvinyl alcohol, the first plasticizer polyethylene glycol methyl ether methacrylate, and acetylene black in the organic solvent DMAC at a mass ratio of 40:10:50, and mix them uniformly to form the first A coating slurry, coating the first coating slurry on the surface of the positive electrode active material layer in step 1), and drying w...

Embodiment 3

[0077] 1. Preparation of positive electrode sheet containing double-layer coating:

[0078] 1) Mix NCM high-nickel 8-series positive electrode (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) at a mass ratio of 97:1.5:1.5 to make positive electrode slurry Material, the positive electrode slurry is coated on both surfaces of the current collector aluminum foil, dried at 100°C to form a positive electrode active material layer, and then cold pressed to obtain a positive electrode sheet containing an active material layer;

[0079] 2) the first polymer polyvinyl alcohol and acetylene black are dissolved in the organic solvent N with a mass ratio of 50:50, in N-dimethylformamide (DMF), mix uniformly to make the first coating slurry, and The first coating slurry is coated on the surface of the positive electrode active material layer in step 1), and air-dried at 60° C. to obtain a positive electrode s...

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Abstract

The invention provides an electrode plate and a lithium ion battery comprising the same. The electrode plate of the present invention comprises: a current collector having two opposite surfaces; an active material layer coated on at least one surface of the current collector; a first coating layer coated on the active material layer; and a second coating layer coated on the first coating layer; wherein the first coating at least comprises a first polymer and a first conductive agent; and the second coating includes at least a second polymer. According to the invention, by constructing the double-layer coating, not only can the needling safety of the battery be improved, but also the electrical performance of the battery can be ensured not to be influenced to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an electrode sheet and a lithium ion battery containing the electrode sheet, in particular to an electrode sheet containing a double-layer coating and a lithium ion battery containing the electrode sheet. Background technique [0002] At present, the development of lithium-ion batteries is mainly moving towards high energy density and ultra-fast charging technology, such as the application of high-nickel ternary, silicon-carbon anode and other materials, which greatly deteriorates the intrinsic safety of the battery, and the abuse under various conditions , such as overcharge, high temperature, impact and other external uncontrollable factors, battery safety accidents occur frequently, so it is very necessary to improve battery safety. [0003] There are many ways to improve battery safety, such as diaphragm coating modification, high temperature resistant diaphragm, ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M10/0525H01M10/42
CPCH01M4/13H01M10/0525H01M10/4235H01M2004/021Y02E60/10
Inventor 赵伟李素丽张赵帅唐伟超董德锐
Owner ZHUHAI COSMX BATTERY CO LTD
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