Positive plate and lithium ion battery containing positive plate

A technology of positive electrode sheet and positive active material, which is applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problems of battery pot cover deformation, battery bottom and top bulging, etc., to reduce dynamic capacity and improve cycle Longevity, effect on improving cycle expansion and safety concerns

Inactive Publication Date: 2021-02-02
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a positive electrode sheet and a lithium ion battery containing the positive electrode sheet, which can solve the problems caused by the lithium analysis in the edge area of ​​the negative electrode sheet during the long-term cycle process, which will cause the bottom and top of the battery cell to bulge, and the deformation of the battery pot cover. security issues

Method used

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  • Positive plate and lithium ion battery containing positive plate
  • Positive plate and lithium ion battery containing positive plate
  • Positive plate and lithium ion battery containing positive plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11 and comparative example 1-5

[0091] In the following examples and comparative examples, the negative electrode sheet was prepared by a method known in the art, and for details, please refer to the following preparation process.

[0092] The chemical formula of the ternary material used in the following examples and comparative examples is: LiNi 0.5 co 0.2 mn 0.3 o 2 (NCM523).

[0093] The 1wt% carbon-coated lithium cobaltate and 3wt% carbon-coated lithium cobaltate used in the following examples and comparative examples were purchased from commercial channels.

[0094] In the description of the present invention, it should be noted that the terms "first", "second" and so on are only used for descriptive purposes, and do not indicate or imply relative importance.

Embodiment 1

[0096] Preparation method of positive electrode sheet:

[0097] (1) Preparation of slurry

[0098] Positive electrode slurry:

[0099] Prepare the first active material slurry: add the first positive electrode active material, conductive carbon black and binder polyvinylidene fluoride (PVDF) into the stirring tank according to the mass ratio of 97.2:1.5:1.3, and add according to the known batching process NMP is made into the first positive electrode active material slurry, passed through a 200-mesh sieve, and made into the first positive electrode active material slurry, and the solid content of the slurry is 70% to 75%;

[0100] Prepare the second active material slurry: add the second positive electrode active material, conductive carbon black and binder polyvinylidene fluoride (PVDF) into the stirring tank according to the mass ratio of 97.2:1.5:1.3, and add according to the known batching process NMP is made into the second positive electrode active material slurry, pas...

Embodiment 2-11

[0110] The difference between embodiment 2-11 and embodiment 1 is: adopt different positive electrode active material (embodiment 2~6), the active material of different particle size (embodiment 7~9), add the conductive agent of different content (implementation Examples 10-11).

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Abstract

The invention discloses a positive plate and a lithium ion battery containing the positive plate. The positive plate comprises a current collector and a coating located in a coating area of the current collector; the coating comprises a first coating area and a second coating area; the first coating area is located on the surface of the current collector coating area, and the contact surface of the first coating area and the current collector coating area completely covers the current collector coating area; the second coating area is located above the first coating area and comprises an areaE and an area E', the area E and the area E' are located on the long edge sides of the first coating area respectively, and the area E and the area E' are independent of each other or at least have one intersection point; and both the first coating area and the second coating area contain active substances. The problem of lithium precipitation in the edge area of the negative electrode is fully solved, a cruising ability of the lithium ion battery is improved, the problems of cyclic expansion and battery cell deformation are solved, and a safety risk is reduced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a positive electrode sheet and a lithium ion battery containing the positive electrode sheet. Background technique [0002] With the rapid development of lithium-ion battery technology, lithium-ion batteries are more and more widely used in portable mobile electronic devices such as notebook computers and smart phones. However, as people's life rhythm becomes faster, the energy density and Charging speeds still fall short of the demands placed on lithium-ion batteries for a variety of consumer electronics. Therefore, increasing the charging speed of lithium-ion batteries while increasing the energy density of lithium-ion batteries has become the focus of research in the lithium-ion battery industry today. However, the current dismantling of the battery cell found that the lithium ionization in the edge area of ​​the negative electrode sheet of the lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张保海彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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