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Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of unstable structure of graphite crucible waste, high price of needle coke raw materials, and low degree of graphitization, etc. The effect of excellent chemical properties, less impurities and simple preparation method

Pending Publication Date: 2019-09-06
漳州巨铭石墨材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of needle coke raw materials is high, and the processing procedures of petroleum coke and needle coke are long; the structure of graphite crucible waste is unstable, there are many impurities, and the degree of graphitization is not high

Method used

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  • Lithium ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0041] Correspondingly, the present invention also provides a kind of preparation method of above-mentioned negative electrode material of lithium ion battery, comprises the following steps:

[0042] S1. Add the artificial graphite electrode fragments to the iron remover to remove iron;

[0043] Since the artificial graphite electrode will be mixed with some iron during the preparation process, if the iron content in the negative electrode material of the lithium-ion battery is too much, it will affect the performance of the lithium-ion battery.

[0044] Specifically, the artificial graphite electrode fragments are added to the permanent magnetic iron remover, wherein the magnetic flux of the permanent magnetic iron remover is greater than 8000Gs.

[0045] Preferably, the magnetic flux of the permanent magnet iron remover is 8000-13000Gs. If the magnetic flux of the permanent magnetic iron remover is less than 8000Gs, the amount of iron removal will not reach the preset value. ...

Embodiment 1

[0062] A preparation method for a lithium ion battery negative electrode material, comprising the following steps:

[0063] S1. Add artificial graphite electrode fragments into the hopper, and put them into the iron remover through the hopper. The magnetic flux of the iron remover is 8000Gs, and the feeding speed is 10-30kg / min to remove iron;

[0064] S2, crushing the artificial graphite electrode after iron removal to obtain artificial graphite electrode powder, the particle size distribution of the artificial graphite electrode powder is: D50=11 μm;

[0065] S3, spheroidizing and grading the artificial graphite electrode powder to obtain the artificial graphite electrode powder, the particle size distribution of the artificial graphite electrode powder is: D10=6 μm, D50=15 μm, D90=30 μm, the tap density of the artificial graphite electrode powder 0.8g / cm 3 , the specific surface area is 6.5m 2 / g;

[0066] S4, adding the artificial graphite electrode powder into the dema...

Embodiment 2

[0069] A preparation method for a lithium ion battery negative electrode material, comprising the following steps:

[0070] S1. Put artificial graphite electrode fragments into the hopper, and put them into the iron remover through the hopper. The magnetic flux of the iron remover is 10000Gs, and the feeding speed is 10-30kg / min to remove iron;

[0071] S2, crushing the artificial graphite electrode after iron removal to obtain artificial graphite electrode powder, the particle size distribution of the artificial graphite electrode powder is: D50=15 μm;

[0072] S3, spheroidizing and grading the artificial graphite electrode powder to obtain the artificial graphite electrode powder, the particle size distribution of the artificial graphite electrode powder is: D10=8 μm, D50=18 μm, D90=33 μm, the tap density of the artificial graphite electrode powder 0.85g / cm 3 , the specific surface area is 6.0m 2 / g;

[0073] S4, adding the artificial graphite electrode powder into the de...

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Abstract

The invention discloses a lithium ion battery negative electrode material. The material is made of an artificial graphite electrode by iron removal, crushing, spheroidization, classification, demagnetization and sieving. The particle size distribution of the lithium ion battery negative electrode material is that D10=5-10 [mu]m, D50=10-30 [mu]m and D90=30-50 [mu]m. Correspondingly, the invention also provides the lithium ion battery negative electrode material and a preparation method thereof. The preparation method of the invention is simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Energy is an important factor in the development of the earth, and materials related to energy have always been the subject of human development and progress. Nowadays, petroleum energy is about to be exhausted, and as a chemical power source that can convert chemical energy into electrical energy, it can replace petroleum as an energy source for human development and progress. In 1990, after Sony Corporation of Japan used graphite-structured carbon materials as the negative electrode of lithium-ion batteries, lithium-ion batteries began to enter commercialization. Lithium-ion batteries have the advantages of large specific capacity, long cycle life, high output voltage, low self-discharge rate, wide application temperature ra...

Claims

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Application Information

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IPC IPC(8): C01B32/215C01B32/21H01M4/587H01M10/0525
CPCC01B32/215C01B32/21H01M4/587H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 彭锴张军军吴国新郑紫烽石靖山庄建龙
Owner 漳州巨铭石墨材料有限公司
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