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Negative plate and lithium ion battery comprising same

A negative electrode, lithium ion technology, applied in the field of lithium ion battery materials, can solve problems such as being unable to be well compatible with high energy density and fast charging

Active Publication Date: 2020-11-10
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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  • Negative plate and lithium ion battery comprising same
  • Negative plate and lithium ion battery comprising same
  • Negative plate and lithium ion battery comprising same

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 plate and a lithium ion battery comprising the same. According to the invention, the active substance and the surface density of the negative plate are specifically designed according to the potential and polarization distribution of the negative plate, so the design of the battery can meet the rapid charging requirement to the greatest extent, the waste of energydensity can be reduced, and both rapid charging and high energy density are realized. In a simple way, a double-layer coating technology is utilized to control the proportion of the two active material layers in the length range of the negative electrode current collector in the length direction, i.e., the proportion of the first negative electrode active material layer with large polarization and low potential is large, and the proportion of the second negative electrode active material layer with small polarization and high potential is small. The energy density of the negative plate is improved compared with the energy density of a conventional negative plate, so both quick charging and high energy density can be realized.

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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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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