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Negative plate and laminated lithium ion battery comprising same

A negative electrode sheet and negative electrode technology, applied in the field of laminated lithium-ion batteries, can solve the problems of incompatibility with high energy density and fast charging, achieve both fast charging and high energy density, widen the lithium analysis window, and quickly The effect of increasing the charging level

Active Publication Date: 2020-12-15
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current lithium-ion batteries are not well compatible with the two properties of high energy density and fast charging.

Method used

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  • Negative plate and laminated lithium ion battery comprising same
  • Negative plate and laminated lithium ion battery comprising same
  • Negative plate and laminated lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Add 0.5wt% conductive carbon black, 1.3wt% styrene-butadiene rubber, and 1.3wt% carboxymethyl cellulose to 96.9wt% graphite a, and then adjust it into negative electrode slurry A with water. Add 0.5wt% conductive carbon black, 1.3wt% styrene-butadiene rubber, and 1.3wt% carboxymethyl cellulose to 96.9wt% graphite b, and then adjust it into negative electrode slurry B with water.

[0066] Such as Figure 4 As shown, the negative electrode sheet includes a negative electrode collector, and a central area, a first edge, a second edge, a third edge, and a fourth edge are provided on the first surface of the negative electrode collector; the first edge, The second edge, the third edge and the fourth edge are arranged around the central area, and the first edge and the third edge are arranged opposite; the second edge and the fourth edge are arranged opposite;

[0067] Wherein, a first coating area is set in the central area, and a second coating area is set in the first...

Embodiment 2

[0073] Others are the same as in Example 1, only the area of ​​double-layer coating is different, that is, the area of ​​the first coating area is 1 / 2 of the sum of the areas of the first coating area and the second coating area, such as Figure 4 As shown, the areas of the first edge, the second edge, the third edge and the fourth edge are all 1 / 8.

Embodiment 3

[0075] Others are the same as in Example 1, except that the compositions of slurry A and slurry B are different.

[0076] Add 0.5wt% conductive carbon black, 1.3wt% styrene-butadiene rubber, and 1.3wt% carboxymethyl cellulose to 96.9wt% graphite a, and then adjust with water to prepare negative electrode slurry A. Add 1.0wt% conductive carbon black, 1.3wt% styrene-butadiene rubber, and 1.3wt% carboxymethyl cellulose to 96.4wt% graphite b, and then adjust with water to prepare negative electrode slurry B.

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Abstract

The invention provides a negative plate and a laminated lithium ion battery comprising the negative plate, and the laminated lithium ion battery using the negative plate can effectively improve the quick charging capacity of the laminated lithium ion battery on the premise of keeping the energy density not lost. The negative plate adopts the double-layer coating technology, the active substances and the surface density of the negative plate are specifically designed according to the potential and the polarization distribution of the negative plate, and the edge position of the negative plate is controlled to adopt double-layer coating by utilizing the double-layer coating technology; on the one hand, the accumulation mode of negative electrode active material particles can be changed through double-layer coating, edge polarization is reduced, reaction places are increased, internal resistance is reduced, and lithium precipitation cannot be generated on the edge; on the other hand, compared with single-layer coating, the double-layer coating can ensure that the charging speed capable of being supported under the same surface density is higher, so that the energy density cannot be lost.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative electrode sheet and a laminated lithium ion battery including the negative electrode sheet. Background technique [0002] With the development of electronic products, people no longer only pursue high energy density for lithium-ion batteries, and charging speed has become one of the key evaluation criteria for consumers. However, the current lithium-ion batteries are not well compatible with the two properties of high energy density and fast charging. Contents of the invention [0003] The invention provides a negative electrode sheet and a laminated lithium ion battery including the negative electrode sheet. The laminated lithium ion battery using the negative electrode sheet can effectively improve the energy density of the laminated lithium ion battery without loss of energy density. The fast charging capability of the battery. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M10/0525H01M10/0585
CPCH01M4/133H01M4/1393H01M10/0525H01M10/0585H01M2004/027Y02E60/10Y02P70/50
Inventor 石越彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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