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Positive electrode sheet and battery

A positive electrode, battery technology, applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problem of low battery safety, and achieve the effect of increasing the heat dissipation area, reducing the internal resistance of the electrode, and improving the safety.

Active Publication Date: 2020-12-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a positive electrode sheet and a battery to solve the problem of low battery safety in the prior art

Method used

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  • Positive electrode sheet and battery
  • Positive electrode sheet and battery
  • Positive electrode sheet and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment provides a lithium-ion battery that reduces temperature rise and increases life cycle, the specific method is:

[0057] A mixture of 97.8% lithium cobaltate, 1.1% conductive agent and 1.1% binder is uniformly dispersed in N-methylpyrrolidone (NMP) solvent to make positive electrode slurry P-A; the slurry P-A is placed in In the coating machine, coating is carried out, and the coating method includes one of extrusion coating, transfer coating, and roll coating, and the empty foil with a width of PW2 is laser cleaned for the coated pole piece area, the slurry P-B made of 85% ceramic powder, 10% inorganic ionic material and 5% binder is coated on the empty foil area to obtain the positive electrode sheet; 96.5% graphite, 0.5% conductive agent and A mixture of 3% binder is uniformly dispersed in NMP solvent to make negative electrode slurry N-A; the slurry N-A is placed in a coating machine for coating, and the coating method includes extrusion coating, A t...

Embodiment 2

[0060] A lithium-ion battery with reduced temperature rise and increased cycle life, the difference from Example 1 is that the diameter of the ceramic particles is 25 microns.

Embodiment 3

[0062] A lithium-ion battery with reduced temperature rise and increased cycle life, the difference from Example 1 is that the diameter of the ceramic particles is 30 microns.

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Abstract

The invention provides a positive electrode sheet and a battery. The positive electrode sheet comprises a positive current collector, wherein one side or two sides of the positive current collector is / are coated with a first coating area, a second coating area and a third coating area, the first coating area, the second coating area and the third coating area are distributed along a first direction, the first direction is the length direction of the positive current collector, in the width direction of the positive electrode current collector, the second coating area is positioned between thefirst coating area and the third coating area, the first coating area and the third coating area are coated with a positive electrode active material layer, the second coating area is coated with a porous material layer, the pore diameter of the porous material layer is greater than 50 nm, and the porosity is greater than 30%. The embodiment of the invention can improve the safety of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode sheet and a battery. Background technique [0002] Today, lithium-ion batteries are widely used in various industries as an environmentally friendly green energy source. Consumer electronic products have higher and higher requirements on the service life and fast charging capacity of lithium secondary batteries. In order to meet customer needs, the capacity of lithium ion batteries is getting bigger and bigger, and the charging rate is also increasing. [0003] In the prior art, for the pole piece of a lithium-ion battery, it is usually necessary to coat a layer of active material on the surface of the pole piece, and the ion exchange between the positive and negative active materials of the positive pole piece and the negative pole piece realizes charge and discharge. However, when the battery capacity increases and the charging rate increases, it is easy...

Claims

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Application Information

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IPC IPC(8): H01M4/74H01M10/0525H01M4/02
CPCH01M4/742H01M10/0525H01M4/0404H01M2004/028H01M2004/021Y02E60/10H01M4/366H01M2004/027
Inventor 李根宗彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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