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Positive plate and battery

A positive electrode sheet and battery technology, which is applied in the direction of positive electrodes, battery electrodes, secondary batteries, etc., can solve the problems of reduced structural stability of lithium cobalt oxide, high-temperature cycle deterioration of lithium-ion batteries, etc., and achieves long energy density and cycle life Both effects

Active Publication Date: 2021-08-20
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a positive electrode sheet and a battery to solve the problem that the structural stability of the existing lithium cobaltate is reduced, which in turn leads to the deterioration of the high-temperature cycle of the lithium-ion battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Prepare two kinds of positive electrode slurry at the same time: P slurry: use P lithium cobaltate as the main material, prepare P slurry according to the 97.5% formula; X slurry: use X lithium cobaltate as the main material, prepare according to the 97.5% formula X slurry.

[0123] Use a double-layer coater to coat two layers at the same time, apply P slurry near the aluminum foil area, and apply X slurry near the diaphragm area. The surface density ratio of the two types of slurry is: m(P):m(X)= 7:3, that is, to ensure that the proportion of the surface active material to the total thickness of the pole piece is 30% (this proportion is controlled by controlling the density of the upper and lower layers). Then complete the cell production according to the mass production process.

Embodiment 2

[0125] Prepare two kinds of positive electrode slurry at the same time: P slurry: use P lithium cobaltate as the main material, prepare P slurry according to the 97.5% formula; Y slurry: use Y lithium cobaltate as the main material, prepare according to the 97.5% formula Y slurry.

[0126]Use a double-layer coater to coat two layers at the same time, coat P slurry near the aluminum foil area, and coat Y slurry near the diaphragm area. The surface density ratio of the two types of slurry is: m(P):m(Y)= 7:3, that is, to ensure that the proportion of the surface active material to the total thickness of the pole piece is 30% (this proportion is controlled by controlling the density of the upper and lower layers). Then complete the cell production according to the mass production process.

Embodiment 3

[0128] Two kinds of positive electrode slurries were prepared at the same time: P slurry: with P lithium cobaltate as the main material, prepared into P slurry according to the 97.5% formula; Z slurry: with Z lithium cobaltate as the main material, prepared according to the 97.5% formula Y slurry.

[0129] Use a double-layer coater to coat two layers at the same time, apply P slurry near the aluminum foil area, and apply Z slurry near the diaphragm area. The surface density ratio of the two types of slurry is: m(P):m(Z)= 7:3, that is, to ensure that the proportion of the surface active material to the total thickness of the pole piece is 30% (this proportion is controlled by controlling the density of the upper and lower layers). Then complete the cell production according to the mass production process.

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Abstract

The invention provides a positive plate and a battery, and relates to the technical field of lithium ion batteries. The positive plate comprises a current collector, wherein the current collector comprises a first side surface and a second side surface which are arranged oppositely, at least one of the first side surface and the second side surface is provided with an active material layer, and the active material layer comprises a first active material layer and a second active material layer; under the condition that the target ratio is less than or equal to 40%, the aluminum element content of the lithium cobalt oxide particles of the second active material layer is 5700-6300 ppm; under the condition that the target ratio is greater than 40% and less than or equal to 60%, the aluminum element content of the lithium cobalt oxide particles of the second active material layer is 6500-7100 ppm; and under the condition that the target ratio is greater than 60%, the aluminum element content of the lithium cobalt oxide particles of the second active material layer is 7200-7800 ppm. The problem that the high-temperature cycle of the lithium ion battery becomes poor due to the fact that the structural stability of existing lithium cobalt oxide is reduced can be solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode sheet and a battery. Background technique [0002] With the continuous development of lithium-ion battery technology, the utilization rate of lithium-ion batteries in people's daily life is getting higher and higher. The wide application of lithium-ion batteries makes the requirements for the energy density of lithium-ion batteries themselves higher and higher. Therefore, It is necessary to increase the gram capacity of the positive electrode active material in the lithium ion battery to increase the energy density of the lithium ion battery. However, increasing the gram capacity of the positive active material in the lithium-ion battery will increase the delithiation of lithium cobaltate in the positive plate, resulting in a decrease in the structural stability of lithium cobaltate, which in turn will lead to poor high-temperature cycling of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/525H01M10/0525
CPCH01M4/131H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 徐延铭陈博彭冲韦世超李俊义
Owner ZHUHAI COSMX BATTERY CO LTD