Negative plate, preparation method and lithium-ion battery comprising negative plate

A technology of negative electrode sheet and lithium ion, applied in the field of preparation method and lithium ion battery including the same, and negative electrode sheet

Active Publication Date: 2020-08-14
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode sheet is mainly used to solve the problem of lithium analysis in the single-sided coating area of ​​the negative electrode of the battery cell with a winding structure during the long cycle process under the high-rate fast charging system

Method used

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  • Negative plate, preparation method and lithium-ion battery comprising negative plate
  • Negative plate, preparation method and lithium-ion battery comprising negative plate
  • Negative plate, preparation method and lithium-ion battery comprising negative plate

Examples

Experimental program
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Effect test

Embodiment 1

[0067] The first step: prepare the slurry that forms the first negative electrode active material layer: the first negative electrode active material (artificial graphite), the first conductive agent (conductive carbon black) and the first binder (sodium carboxymethyl cellulose) According to the mass ratio of 97:1.5:1.5 into the stirring tank, adding deionized water to prepare the slurry forming the first negative electrode active material layer, the solid content of the negative electrode slurry is 40wt% ~ 45wt%; wherein, the first The particle size distribution of the negative electrode active material is: 3μm10 50 90 <13μm;

[0068] The second step: prepare the slurry forming the second negative electrode active material layer: the second negative electrode active material (artificial graphite), the second conductive agent (conductive carbon black) and the second binding agent (sodium carboxymethyl cellulose) According to the mass ratio of 97:1.5:1.5 into the stirring tank,...

Embodiment 2-3 and comparative example 1-2

[0075] Other operating steps are the same as in Example 1, the difference is only in the thickness of the single-sided coating area, the thickness of the first negative electrode active material layer and the second negative electrode active material layer in the double-sided coating area are different, specifically as shown in Table 1 .

[0076] The structural parameter of the negative plate of table 1 embodiment 1-3 and comparative example 1-2

[0077]

[0078] The negative electrode sheets prepared in each example have the same compaction, and will be assembled into a soft-pack battery cell model 386283, and the energy density will be tested at 0.2C / 0.2C charge and discharge at 25°C. The core was charged at 2.5C / discharged at 0.7C at 25°C, and the battery was disassembled at different cycles to confirm the lithium deposition on the single-sided coating area of ​​the battery negative electrode and the lithium deposition on the negative electrode surface. The disassembly r...

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Abstract

The invention provides a negative plate, a preparation method and a lithium-ion battery comprising the negative plate. The negative plate comprises a negative current collector, and the negative current collector comprises a single-sided coating area and a double-sided coating area; in the double-sided coating region, second coating layers are arranged on the surfaces of the two sides of the negative electrode current collector respectively, each second coating layer comprises a first negative electrode active substance layer and a second negative electrode active substance layer, the second negative electrode active substance layers are arranged on the surface of the negative electrode current collector, and the first negative electrode active substance layers are arranged on the surfacesof the second negative electrode active substance layers. The lithium-ion battery comprising the negative plate has the following effects: (1) the lithium precipitation problem of a single-side coating area of a negative electrode of a lithium-ion battery with a conventional winding structure can be effectively improved, the cycle life of the lithium-ion battery is prolonged, and the cycle expansion of the lithium-ion battery is reduced; (2) the compaction of the negative electrode is improved, and the energy density of a cell is increased; (3) the dynamic performance of the negative electrode is improved, and the quick charging capacity of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative electrode sheet, a preparation method and a lithium ion battery containing the same. Background technique [0002] With the rapid development of modern society, portable electronic devices (mobile phones, computers, etc.) are increasingly used. Lithium-ion batteries are widely used in portable mobile electronic device terminals because of their long cycle life and high power density. At present, it seems that fast charging lithium-ion batteries have become the main development trend of consumer lithium-ion batteries. The development of fast-charging lithium-ion battery technology has brought convenience to people, but it has also brought safety problems. Lithium-ion batteries are very likely to cause lithium-ion deposition at the negative electrode of lithium-ion batteries during long cycles under high-rate fast charging conditions, especiall...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M10/0525H01M10/0587
CPCH01M4/133H01M4/1393H01M10/0525H01M10/0587Y02E60/10H01M10/0404H01M2004/021H01M2004/027H01M4/13Y02P70/50H01M4/0404H01M4/366
Inventor 张保海彭冲贺伟施超李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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