A negative electrode sheet and a lithium-ion battery including the negative electrode sheet

A negative electrode and lithium-ion technology, applied in the field of lithium-ion battery materials, can solve the problems of not being well compatible with high energy density and fast charging, and achieve fast charging and high energy density, energy density improvement, and fast charging Compatibility with high energy density

Active Publication Date: 2021-07-16
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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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  • A negative electrode sheet and a lithium-ion battery including the negative electrode sheet
  • A negative electrode sheet and a lithium-ion battery including the negative electrode sheet
  • A negative electrode sheet and a lithium-ion battery including the negative electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1-1) Add 0.5wt% conductive carbon, 1.3wt% styrene-butadiene rubber, and 1.3wt% carboxymethyl cellulose to 96.9wt% fast-filling graphite, and then adjust with water to make negative electrode slurry A.

[0081] (1-2) Add 0.5wt% conductive carbon, 1.3wt% styrene-butadiene rubber, and 1.3wt% carboxymethyl cellulose to 96.9wt% conventional graphite, and then adjust with water to prepare negative electrode slurry B.

[0082] (1-3) The negative electrode slurry B is coated on the negative electrode current collector by double-layer coating equipment, the negative electrode slurry A is coated on the negative electrode slurry B, dried, rolled, cut, and sheeted, and prepared Negative plate.

[0083] Specifically, the structure of the negative electrode sheet is as follows figure 1 As shown, from one end of the negative electrode current collector and along the length direction of the negative electrode current collector, the negative electrode current collector includes an emp...

Embodiment 2-5

[0088] Examples 2-5 are the same as Example 1 except that the composition of the negative electrode slurry A and negative electrode slurry B is different, and the structure of the negative electrode sheet is different, as shown in Table 1.

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Abstract

The invention provides a negative electrode sheet and a lithium ion battery comprising the negative electrode sheet. The present invention specifically designs the active material and surface density of the negative electrode according to the potential and polarization distribution of the negative electrode, so that the design of the battery can meet the demand for fast charging to the greatest extent and can reduce the waste of energy density, realizing fast charging and High energy density combined. To put it simply, using double-layer coating technology, the ratio of the length range of the two active material layers along the length direction of the negative electrode current collector is controlled, that is, the first negative electrode active material layer with large polarization and low potential accounts for more, and the polarized The second negative electrode active material layer which is small and has a high potential accounts for a small proportion. The energy density of the negative electrode sheet is improved compared with that of conventional negative electrode sheets, that is, both fast charging and high energy density can be achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a negative electrode sheet and a 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. The current lithium-ion batteries are not well compatible with the two properties of high energy density and fast charging. The greater the charge rate, the greater the polarization of the lithium-ion battery, and the more significant the difference in the potential distribution of the negative electrode. [0003] Taking a conventionally wound soft-packed lithium-ion battery as an example, as the charging rate increases, the disassembled negative electrode always appears the phenomenon of "lithium deposition" from near the tab,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/587H01M10/0525
CPCH01M4/133H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 石越彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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