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Negative plate and lithium ion battery comprising same

A negative electrode sheet and negative electrode technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problem that the energy density and charging speed of lithium-ion batteries cannot be balanced, so as to improve dynamic performance without loss of energy density, and reduce battery life. The effect of small polarization

Pending Publication Date: 2021-09-28
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the energy density and charging speed of lithium-ion batteries cannot be balanced in the prior art, the invention provides a negative electrode sheet and a lithium-ion battery including the negative electrode sheet

Method used

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  • Negative plate and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Other operations are the same as Comparative Example 1, the difference lies in the preparation of the negative plate:

[0054] With 96.9g graphite, 0.5g porous material carbon black (particle diameter is: D 10 50 90 30m 2 / g; porosity ≥ 50%), 0.5g conductive agent SP, 1.3g binder sodium carboxymethylcellulose (CMC), 1.3g binder styrene-butadiene rubber (SBR), 300g deionized water, with The slurry is prepared by a wet process, coated on the surface of the copper foil of the negative electrode collector, and then dried, rolled and die-cut to obtain the negative electrode sheet.

Embodiment 2

[0056] Other operations are the same as Comparative Example 1, the difference lies in the preparation of the negative plate:

[0057] 96.9g graphite, 0.5gLATP (Li 1.5 Ti 1.5 Al 0.5 (PO 4 ) 3 ) (particle size: D 10 50 90 30m 2 / g), 0.5g conductive agent SP, 1.3g binder sodium carboxymethylcellulose (CMC), 1.3g binder styrene-butadiene rubber (SBR), 300g deionized water, made slurry by wet process , coated on the surface of the copper foil of the negative electrode current collector, and then dried, rolled and die-cut to obtain the negative electrode sheet.

[0058] Performance Testing:

[0059] (1) Battery rate charging performance test:

[0060] Test at a temperature of 25±5°C, the test process:

[0061] 1. Stand still for 10 minutes;

[0062] 2. Discharge at 0.2C to the lower limit voltage of 3.0V;

[0063] 3. Stand still for 10 minutes;

[0064] 4. Charge at a certain rate (0.2C / 0.5C / 1C / 1.5C / 2C), cut-off current 0.05C; among them, record the constant current char...

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Abstract

The invention provides a negative plate and a lithium ion battery comprising the same. In the invention, when negative electrode slurry is prepared, an additive, a negative electrode active material, a conductive agent and a binder are added into the negative electrode slurry together, and the negative plate containing the additive can be prepared after coating. The additive has a porous structure or has Li < + > conduction capability, and can be adsorbed on the surface of a negative active material, and the introduction of the additive can significantly increase a Li < + > transmission channel of the negative plate, improve the dynamic performance of the negative plate, reduce polarization, and prevent the performance deterioration of the negative plate. Therefore, the obtained lithium ion battery does not lose energy density, and can meet the requirement of quick charge.

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 lithium ion battery including the negative electrode sheet. Background technique [0002] In recent years, lithium-ion batteries have been widely used in smartphones, tablet computers, smart wearables, power tools, and electric vehicles. With the acceleration of the pace of life and the development of electronic products, consumers have more urgent needs for shortening the charging time of lithium-ion batteries and improving the energy density of lithium-ion batteries. [0003] In order to achieve fast charging of lithium-ion batteries, it is necessary to reduce the coating thickness of the pole piece, shorten the migration distance of lithium ions, and increase the migration rate of lithium ions. However, in order to meet the high energy density requirements of the battery cell, it is usually necessary to increase the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/62H01M4/624H01M4/13H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王静张双虎彭宁
Owner ZHUHAI COSMX BATTERY CO LTD
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