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Lithium ion battery negative electrode material, negative electrode and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of limited coating amount, poor fast charge and discharge performance, uneven coating, etc.

Active Publication Date: 2021-06-08
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this method is to provide a negative electrode material for lithium-ion batteries, which aims to solve the technical problems in the existing carbon-coated negative electrode materials such as uneven coating, limited coating amount, and poor rapid charge and discharge performance.

Method used

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  • Lithium ion battery negative electrode material, negative electrode and lithium ion battery
  • Lithium ion battery negative electrode material, negative electrode and lithium ion battery
  • Lithium ion battery negative electrode material, negative electrode and lithium ion battery

Examples

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preparation example Construction

[0076] In the preparation method of the lithium ion battery negative electrode material provided by the present invention, the conductive agent and the conductivity enhancer are sequentially coated on the outer surface of the mixture of the carbon-coated negative electrode material and the hard carbon from the inside to the outside, which can improve the performance of the obtained lithium ion battery negative electrode material. Conductivity, which helps to improve the rapid charge and discharge performance of lithium-ion batteries.

[0077] In some embodiments, the conductive agent includes long-chain conductive carbon black and branched-chain conductive carbon black. The order of formula conductive carbon black and conductivity enhancer is added and stirred. In the embodiment of the present invention, by selecting a specific conductive agent and a conductive enhancer, and coating the conductive agent and the conductive enhancer on the outer surface of the mixture of the car...

Embodiment 1

[0082] A lithium ion battery negative electrode material, its preparation method comprises the steps:

[0083] 1) Gluing: First, mix carboxymethyl cellulose and deionized water at a mass ratio of 1:99, and fully stir at a rotation speed of 1500 rpm and a revolution speed of 45 rpm for 120 minutes (scraping during stirring for 20 minutes) to prepare a glue solution. Among them, carboxymethyl cellulose accounts for 1.2% of the total mass of lithium-ion battery negative electrode materials;

[0084] 2) Dry blending: mixing hard carbon-coated artificial graphite and hard carbon according to a mass ratio of 60:40 to obtain a mixture, which accounts for 93% of the total mass of the lithium-ion battery negative electrode material;

[0085] 3) Add conductive agent 1: add the long-chain conductive carbon black and the mixture obtained in step 2) into the stirring tank, and stir at a revolution speed of 10 rpm for 10 minutes, so that the long-chain conductive carbon black is coated on t...

Embodiment 2

[0101] This example is basically the same as Example 1, except that in the preparation process of the lithium-ion battery negative electrode material, the hard carbon-coated artificial graphite and hard carbon are mixed in a mass ratio of 62:38 in step 2).

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery negative electrode material, a negative electrode and a lithium ion battery. The lithium ion battery negative electrode material comprises a negative electrode active material, a conductive agent, a conductive enhancer, a dispersant and a binder, wherein the negative electrode active material is a mixture of a carbon-coated negative electrode material and hard carbon. The mixture obtained by mixing the carbon-coated negative electrode material and the hard carbon is used as the negative electrode active material of the lithium ion battery, the amorphous structure of the hard carbon is utilized to facilitate rapid insertion of lithium ions in the negative electrode, and the hard carbon has the advantage of adsorption type lithium storage capability, so that the problem of non-uniform coating of the carbon-coated material can be improved, and on the premise of not influencing safety, environmental protection, low cost and long cycle life, the power performance and rapid charge-discharge performance of the lithium ion battery are further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a lithium-ion battery negative electrode material with fast charging and discharging performance, a negative electrode and a lithium-ion battery. Background technique [0002] With the gradual enhancement of global environmental awareness and the rapid development of the new energy industry, electric vehicles are more and more accepted by consumers. Compared with traditional fuel vehicles, the refueling time does not exceed 5 minutes, and ordinary electric vehicles need several hours to fully charge. Therefore , under the premise of ensuring safety, environmental protection, low cost and long cycle life, the power lithium-ion battery should also have a faster charging capability. [0003] Graphite has the advantages of high capacity, low cost, long cycle life, safety and non-toxicity, and is currently the most widely used negat...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M4/133H01M10/0525
CPCH01M4/625H01M4/587H01M4/133H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 吴治国洪丽张海林张勍邹美靓李艳白培锋
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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