Lithium-ion battery anode material, anode 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., and achieve good charge and discharge performance , Improve electrical conductivity and improve the effect of uneven coating

Active Publication Date: 2022-07-22
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 anode material, anode and lithium-ion battery
  • Lithium-ion battery anode material, anode and lithium-ion battery
  • Lithium-ion battery anode material, anode 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 conductive 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 obtained lithium ion battery negative electrode material. Conductivity 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 conductive carbon black and the conductive enhancer are added in sequence and stirred. In the embodiment of the present invention, by selecting a specific conductive agent and a conductive enhancer, and sequentially coating the conductive agent and the conductive enhancer on the outer surface of the mixture of the carbon-coated negati...

Embodiment 1

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

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

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

[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 min, so that the long-chain conductive carbon...

Embodiment 2

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

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material, a negative electrode and a lithium ion battery. The negative electrode material of the lithium ion battery of the present invention includes 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 carbon-coated negative electrode material and hard carbon. In the present invention, 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 used to facilitate the rapid insertion of lithium ions in the negative electrode, and the hard carbon has an adsorption-type lithium storage It can improve the uneven coating of carbon coating materials, and further improve the power performance and rapid charge-discharge performance of lithium-ion batteries without affecting safety, environmental protection, low cost and long cycle life.

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, a negative electrode and a lithium ion battery with rapid charge and discharge performance. Background technique [0002] With the increasing global awareness of environmental protection and the rapid development of the new energy industry, electric vehicles are more and more accepted by consumers. Compared with traditional fuel vehicles, which take less than 5 minutes to refuel, it takes several hours for an ordinary electric vehicle to be fully charged. , On 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 anode materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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