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Positive plate and battery

A positive electrode sheet and layer activity technology, applied in the field of lithium ion batteries, can solve the problems of reduced structural stability of lithium cobalt oxide, deterioration of high temperature cycling of lithium ion batteries, etc., to improve adhesion, long cycle life, and maintain structural stability. sexual effect

Pending Publication Date: 2021-07-30
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

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Comparison scheme
Effect test

Embodiment 1

[0063] Prepare two positive electrode slurries at the same time: P1 slurry: P lithium cobaltate with M binder, and prepare P1 slurry according to 97.5% formula; Q1 slurry: use Q lithium cobaltate with M binder, according to 97.5% The formulation was prepared as a Q1 slurry.

[0064] Use a double-layer coater to coat two layers at the same time, coat P1 slurry near the aluminum foil area, and coat Q2 slurry near the diaphragm area. The surface density ratio of the two types of slurry is: m(P):m(X)= 5:5, the coating thickness is the same as the above comparative example, and the total thickness of the positive electrode sheet after rolling is 100 μm. Then complete the cell production according to the mass production process.

Embodiment 2

[0066] Prepare two positive electrode slurries at the same time: P2 slurry: P lithium cobaltate with N binder, and prepare P2 slurry according to 97.5% formula; Q2 slurry: use Q lithium cobaltate with N binder, according to 97.5% The formulation was prepared as a Q2 slurry.

[0067] Use a double-layer coater to coat two layers at the same time, apply P2 slurry near the aluminum foil area, and apply Q2 slurry near the diaphragm area. The surface density ratio of the two types of slurry is: m(P):m(X)= 5:5, the coating thickness is the same as the above comparative example, and the total thickness of the positive electrode sheet after rolling is 100 μm. Then complete the cell production according to the mass production process.

Embodiment 3

[0069] Prepare two positive electrode slurries at the same time: P3 slurry: P lithium cobaltate mixed with M and X mixed binders, wherein the amount of M binder is 1.45%, and the amount of X binder is 0.05%, that is, the binder in the formula The total dosage is 1.5%, and the other components and dosage remain unchanged, and the P3 slurry is prepared according to the 97.5% formula; Q3 slurry: Q lithium cobaltate is combined with M and X mixed adhesives, and the amount of M adhesive is 1.45%, the amount of X adhesive is 0.05%, that is, the total amount of adhesive in the formula is 1.5%, other components and amounts remain unchanged, and Q3 slurry is prepared according to the 97.5% formula;

[0070] Use a double-layer coater to coat two layers at the same time, apply P3 slurry near the aluminum foil area, and apply Q3 slurry near the diaphragm area. The surface density ratio of the two types of slurry is: m(P):m(X)= 5:5, the coating thickness is the same as the above comparativ...

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Abstract

The present 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, the current collector comprises a first side surface and a second side surface opposite to each other, at least one of the first side surface and the second side surface is provided with N active material layers, and each active material layer contains lithium cobalt oxide particles and an adhesive. The aluminum element content of the ith active material layer is smaller than that of the (i+1)th active material layer, the ith active material layer comprises a first adhesive, the (i+1)th active material layer comprises a second adhesive, and the molecular weight of the first adhesive is smaller than that of the second adhesive; and the ith layer is an active material layer close to the first side surface or the second side surface. 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): H01M4/131H01M4/36H01M4/525H01M10/0525
CPCH01M4/525H01M4/366H01M4/131H01M10/0525H01M2004/028Y02E60/10
Inventor 陈博彭冲韦世超李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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