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A high-performance lithium-ion power battery negative electrode material

A power battery and negative electrode material technology, which is applied to battery electrodes, batteries, secondary batteries, etc., can solve the problems of poor low-temperature performance, high-temperature discharge performance, poor cycle performance, poor adhesion and uniformity of the negative electrode, and large particles of the negative electrode material. Good high-current charge and discharge performance, reduced active points, improved power and low-temperature performance

Active Publication Date: 2020-09-25
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The negative electrode of the lithium-ion power battery in the prior art has the problems of large particles of negative electrode material, poor adhesion and uniformity of the negative electrode on the copper foil, which in turn will lead to high internal resistance of the battery, low temperature performance, high temperature discharge performance, and cycle performance. poor problem

Method used

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  • A high-performance lithium-ion power battery negative electrode material
  • A high-performance lithium-ion power battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A high-performance lithium-ion power battery negative electrode material comprises the following raw materials in parts by weight: 95 parts of negative electrode granular material, 2 parts of negative electrode conductive agent, and 3 parts of negative electrode binder.

[0047] Wherein, the negative electrode binder is composed of carboxymethyl cellulose and styrene-butadiene rubber with a mass ratio of 1:1.5, wherein the styrene-butadiene rubber is a styrene copolymer with a particle diameter less than 0.2 μm, and the pH of the styrene-butadiene rubber is The value is 6.5-7.5.

[0048]The negative electrode particle material has a core-shell structure, wherein the core material is artificial graphite, the shell material is amorphous carbon, and the particle size of the negative electrode particle material is d 50 ≤6μm.

[0049] The preparation method of the negative electrode granular material comprises the following steps:

[0050] 1) Mix coal tar and pitch at a ma...

Embodiment 2

[0056] A high-performance lithium-ion power battery negative electrode material comprises the following raw materials in parts by weight: 92 parts of negative electrode granular material, 1 part of negative electrode conductive agent, 1.5 parts of negative electrode binder, and 6 parts of carbon / silicon composite sol.

[0057] Wherein, the negative electrode binder is composed of carboxymethyl cellulose and styrene-butadiene rubber with a mass ratio of 1:1.5, wherein the styrene-butadiene rubber is a styrene copolymer with a particle diameter less than 0.2 μm, and the pH of the styrene-butadiene rubber is The value is 6.5-7.5.

[0058] The negative electrode particle material has a core-shell structure, wherein the core material is artificial graphite, the shell material is amorphous carbon, and the particle size of the negative electrode particle material is d 50 ≤6μm.

[0059] The preparation method of the negative electrode granular material comprises the following steps: ...

Embodiment 3

[0073] A high-performance lithium-ion power battery negative electrode material comprises the following raw materials in parts by weight: 98.5 parts of negative electrode granular material, 3 parts of negative electrode conductive agent, 6 parts of negative electrode binder, and 5 parts of carbon / silicon composite sol.

[0074] Wherein, the negative electrode binder is composed of carboxymethyl cellulose and styrene-butadiene rubber with a mass ratio of 1:2, wherein the styrene-butadiene rubber is a styrene copolymer with a particle diameter less than 0.2 μm, and the pH of the styrene-butadiene rubber is The value is 6.5-7.5.

[0075] The negative electrode particle material has a core-shell structure, wherein the core material is artificial graphite, the shell material is amorphous carbon, and the particle size of the negative electrode particle material is d 50 ≤6μm.

[0076] The preparation method of the negative electrode granular material comprises the following steps: ...

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Abstract

The invention relates to the field of lithium ion battery, and discloses a high performance lithium ion power battery negative electrode material which comprises the following raw materials in parts by weight: 92-98.5 parts of a negative electrode particle material, 1-3 parts of a negative electrode conductive agent, and 1.5-6 parts of a negative electrode binder; the negative electrode particle material has a core-shell structure, a core material is artificial graphite, and a shell material is amorphous carbon. According to the lithium ion power battery negative electrode, the negative electrode material has small particles and has good adhesion power and uniformity on a copper foil. After the lithium ion battery is prepared by the negative electrode, not only are the low temperature performance, the high temperature performance and the cycle performance of the battery improved, but also the contact internal resistance of the negative electrode material and the copper foil is reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-performance lithium ion power battery negative electrode material. Background technique [0002] With the gradual strengthening of energy and environmental awareness, new energy vehicles have made great progress in recent years. Among them, electric vehicles are one of the main directions. In the power battery of electric vehicles, lithium-ion batteries occupy a very important position. [0003] At present, the negative electrode of lithium-ion power batteries on the market is mainly graphite. [0004] For example, the Chinese invention patent with the application number 201210092946.6 discloses a method for preparing a negative electrode material of a lithium ion battery. The negative electrode material of a lithium ion battery is obtained by placing a graphite carbon material in a plasma treatment device for processing. The invention also provides a negative pole ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M4/139H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/139H01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525H01M2220/20Y02E60/10
Inventor 杜小红李凡群苏文俊赵星星
Owner WANXIANG 123 CO LTD
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