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Preparation method of natural graphite negative electrode material of lithium ion battery

A lithium-ion battery and natural graphite technology, which is applied in the field of lithium-ion battery natural graphite anode material preparation, can solve the problems of inability to take into account the flow of asphalt and coking, difficulty in setting the heating curve perfectly, and uncontrollable asphalt coating. Coulombic efficiency and cycle performance, obvious coating effect, perfect heating curve

Pending Publication Date: 2022-05-13
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of natural graphite negative electrode material for lithium-ion batteries, so as to solve the uncontrollable coating of asphalt in the market after being heated, and the carbonization is easy to produce a large amount of aromatic oil fume, which affects the environment and cannot be balanced. The flow and coking of pitch make it difficult to perfectly set the heating curve of the carbonization process

Method used

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  • Preparation method of natural graphite negative electrode material of lithium ion battery
  • Preparation method of natural graphite negative electrode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0036] A natural graphite negative electrode material for lithium-ion batteries, natural spherical graphite belongs to flake graphite, the average particle size of natural spherical graphite is 16.2 μm, and the ash content of natural spherical graphite is 0.03%, and the specific surface area of ​​natural spherical graphite is 2.4 m 2 / g;

[0037] A natural graphite negative electrode material for a lithium ion battery, the concentration of the citric acid aqueous solution is: 40%, the citric acid aqueous solution must not contain impurities, and the citric acid aqueous solution is relatively acidic;

[0038] A natural graphite negative electrode material for lithium-ion batteries. Glutaraldehyde is an industrial product with a concentration of 50%. Glutaraldehyde is soluble in organic solvents such as hot water, ethanol, chloroform, glacial acetic acid and ether, and glutaraldehyde is irritating. odor;

[0039] A natural graphite negative electrode material for a lithium ion ...

Embodiment 2

[0050] A natural graphite negative electrode material for lithium-ion batteries, natural spherical graphite belongs to flake graphite, the average particle size of natural spherical graphite is 16.6 μm, and the ash content of natural spherical graphite is 0.03%, and the specific surface area of ​​natural spherical graphite is 2.6 m 2 / g;

[0051] A natural graphite negative electrode material for a lithium ion battery, the concentration of the citric acid aqueous solution is: 40%, the citric acid aqueous solution must not contain impurities, and the citric acid aqueous solution is relatively acidic;

[0052] A natural graphite negative electrode material for lithium-ion batteries. Glutaraldehyde is an industrial product with a concentration of 50%. Glutaraldehyde is soluble in organic solvents such as hot water, ethanol, chloroform, glacial acetic acid and ether, and glutaraldehyde is irritating. odor;

[0053] A natural graphite negative electrode material for a lithium ion ...

Embodiment 3

[0064] A natural graphite negative electrode material for lithium-ion batteries, natural spherical graphite belongs to flake graphite, the average particle size of natural spherical graphite is 16.3 μm, and the ash content of natural spherical graphite is 0.03%, and the specific surface area of ​​natural spherical graphite is 2.1 m 2 / g;

[0065] A natural graphite negative electrode material for a lithium ion battery, the concentration of the citric acid aqueous solution is: 40%, the citric acid aqueous solution must not contain impurities, and the citric acid aqueous solution is relatively acidic;

[0066] A natural graphite negative electrode material for lithium-ion batteries. Glutaraldehyde is an industrial product with a concentration of 50%. Glutaraldehyde is soluble in organic solvents such as hot water, ethanol, chloroform, glacial acetic acid and ether, and glutaraldehyde is irritating. odor;

[0067] A natural graphite negative electrode material for a lithium ion ...

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Abstract

The present invention discloses a lithium ion battery natural graphite negative electrode material, which comprises natural spherical graphite, corn starch, a citric acid aqueous solution and glutaraldehyde, and the natural spherical graphite has characteristics of good conductivity and high crystallinity. The natural graphite negative electrode material of the lithium ion battery manufactured by the preparation method of the natural graphite negative electrode material of the lithium ion battery has relatively good cycle performance, compared with a conventional asphalt coating method, the product has relatively small increase in particle size, the corn starch and the cross-linking agent only play a coating role and do not agglomerate graphite, and the coating is uniform; the specific surface area of the product is greatly reduced, and the coating effect of the corn starch and the cross-linking agent on the spherical graphite is obvious; the gram volume of the product is reduced, but the first coulombic efficiency is obviously improved, and the defects on the surface of the graphite are covered by the coating layer; the capacity retention rate of the product is obviously improved, the coating layer is beneficial to keeping the stability of the material structure, and the preparation method disclosed by the invention is more environment-friendly and lower in cost.

Description

technical field [0001] The invention relates to the technical field of preparation of natural graphite negative electrode materials for lithium ion batteries, in particular to a preparation method of natural graphite negative electrode materials for lithium ion batteries. Background technique [0002] The surface of natural spherical graphite has a large number of defects, which affects the first coulombic efficiency and cycle performance. It must be coated before it can be used as a negative electrode material for lithium-ion batteries. The current general coating process is to mix pitch powder with spherical graphite and then carbonize it. There are still many shortcomings in this technology, such as: [0003] For example, the publication number is CN103855395B, a natural graphite negative electrode material for lithium-ion batteries and its preparation method. Its technology has the following problems: one is that the flow process of asphalt after heating is uncontrollabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/04H01M10/0525C01B32/21
CPCH01M4/366H01M4/583H01M4/62H01M4/0471H01M10/0525C01B32/21H01M2004/027H01M2004/021
Inventor 李海黄伟昙艳
Owner TONGREN UNIV
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