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Positive plate and battery

A positive electrode sheet and active material layer technology, which is applied in the field of positive electrode sheets and batteries, can solve the problems of reduced structural stability of lithium cobaltate and poor high-temperature cycle of lithium-ion batteries, and achieve the effect of improving high-temperature stability and cycle performance

Pending 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

[0081] (1) Two kinds of positive electrode slurries are prepared at the same time: M1 slurry: M1 lithium cobaltate is used as the main material, and M1 slurry is prepared according to 97.5% formula; M2 slurry: M2 lithium cobaltate is used as the main material, according to 97.5% The formula is prepared as M2 slurry; use a double-layer coater to coat two layers at the same time, coat M1 slurry near the aluminum foil area, and coat M2 slurry near the diaphragm area. ):m(M2)=5:5 to complete the coating, and the rolling thickness is 100 μm; the negative electrode sheet can be prepared according to the mass production process.

[0082] (2) After the positive and negative electrode sheets are prepared, they are wound with a ceramic and glue-coated separator with a total thickness of 9 μm, and then the cell production is completed according to the mass production process.

Embodiment 2

[0084] (1) Prepare two positive electrode slurries at the same time: N1 slurry: use N1 lithium cobaltate as the main material, and prepare N1 slurry according to the 97.5% formula; N2 slurry: use N2 lithium cobaltate as the main material, according to 97.5% The formula is prepared as N2 slurry; use a double-layer coater to coat two layers at the same time, apply N1 slurry near the aluminum foil area, and apply N2 slurry near the diaphragm area. ):m(N2)=5:5 to complete the coating, and the rolling thickness is 100 μm; the negative electrode sheet can be prepared according to the mass production process.

[0085] (2) After the positive and negative electrode sheets are prepared, they are wound with a ceramic and glue-coated separator with a total thickness of 9 μm, and then the cell production is completed according to the mass production process.

Embodiment 3

[0087] (1) Two kinds of positive electrode slurries are prepared at the same time: M1 slurry: M1 lithium cobaltate is used as the main material, and M1 slurry is prepared according to 97.5% formula; M2 slurry: M2 lithium cobaltate is used as the main material, according to 97.5% The formula is prepared as M2 slurry; use a double-layer coater to coat two layers at the same time, coat M1 slurry near the aluminum foil area, and coat M2 slurry near the diaphragm area. ):m(M2)=5:5 to complete the coating, and the rolling thickness is 120 μm; the negative electrode sheet can be prepared according to the mass production process.

[0088] (2) After the positive and negative electrode sheets are prepared, they are wound with a ceramic and glue-coated separator with a total thickness of 9 μm, and then the cell production is completed 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 thickness of the positive plate is less than or equal to 110 microns, the aluminum element content of the lithium cobalt oxide particles of the first active material layer is 5600-7200ppm, and the aluminum element content of the lithium cobalt oxide particles of the second active material layer is 6000-8300ppm; and under the condition that the thickness of the positive plate is greater than 110 microns, the aluminum element content of the lithium cobalt oxide particles of the first active material layer is 4700-6300ppm, and the aluminum element content of the lithium cobalt oxide particles of the second active material layer is 6000-7600ppm. 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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IPC IPC(8): H01M4/131H01M4/525H01M10/0525
CPCH01M4/131H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10H01M4/623H01M4/625H01M4/36H01M4/1391H01M4/622H01M4/0404
Inventor 陈博彭冲韦世超李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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