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Method for preparing densely compacted negative electrode material for lithium-ion battery

A technology for lithium-ion batteries and negative electrode materials, which is applied in the field of electrochemistry and can solve problems such as limited improvement.

Inactive Publication Date: 2018-05-11
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the above three measures can improve the compaction density of the graphite negative electrode, the improvement range is limited, and the present invention develops based on this

Method used

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  • Method for preparing densely compacted negative electrode material for lithium-ion battery

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Effect test

Embodiment 1

[0021] refer to figure 1 , the invention provides a kind of method for preparing lithium-ion battery high-pressure negative electrode material, comprises the following steps:

[0022] (1) At room temperature, slowly add tetrabutyl titanate to absolute ethanol at a volume ratio of 1:5. After the addition is complete, stir vigorously for 10-20 minutes;

[0023] (2) Mix glacial acetic acid, distilled water, and absolute ethanol in a volume ratio of 4:10:35, and stir vigorously;

[0024] (3) Slowly add the solution obtained in step (1) to the solution obtained in step (2) under vigorous stirring. After the addition is complete, continue stirring for 30 minutes, and then heat in a water bath for 2 hours;

[0025] (4) boil the natural graphite particles with a medium particle size of 15 μm in 60% concentrated nitric acid for 24 hours, and repeatedly wash with ethanol and distilled water successively, and then dry;

[0026] (5) Add the product of step (4) to the sol obtained in ste...

Embodiment 2

[0029] (1) At room temperature, slowly add tetrabutyl titanate to absolute ethanol, according to the volume ratio of 1:12, after the addition is completed, vigorously stir for 10-20 minutes;

[0030] (2) Mix glacial acetic acid, distilled water, and absolute ethanol in a volume ratio of 4:10:35, and stir vigorously;

[0031] (3) Slowly add the solution obtained in step (1) to the solution obtained in step (2) under vigorous stirring. After the addition is complete, continue stirring for 30 minutes, and then heat in a water bath for 2 hours;

[0032] (4) boil the natural graphite particles with a medium particle size of 15 μm in 60% concentrated nitric acid for 24 hours, and repeatedly wash with ethanol and distilled water successively, and then dry;

[0033] (5) Add the product of step (4) to the sol obtained in step (3), fully stir until uniform, filter, and dry;

[0034] (6) The product obtained in step 4 is heat-treated at 500-800° C. for 12 hours under an inert atmosphere...

Embodiment 3

[0036] (1) At room temperature, slowly add tetrabutyl titanate to absolute ethanol at a volume ratio of 1:5. After the addition is complete, stir vigorously for 10-20 minutes;

[0037] (2) Mix glacial acetic acid, distilled water, and absolute ethanol in a volume ratio of 4:15:35, and stir vigorously;

[0038] (3) Slowly add the solution obtained in step (1) to the solution obtained in step (2) under vigorous stirring. After the addition is complete, continue stirring for 30 minutes, and then heat in a water bath for 2 hours;

[0039] (4) boil the natural graphite particles with a medium particle size of 15 μm in 60% concentrated nitric acid for 24 hours, and repeatedly wash with ethanol and distilled water successively, and then dry;

[0040] (5) Add the product of step (4) to the sol obtained in step (3), fully stir until uniform, filter, and dry;

[0041] (6) The product obtained in step 4 is heat-treated at 500-800° C. for 12 hours under an inert atmosphere to obtain a ne...

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Abstract

The invention discloses a method for preparing a densely compacted negative electrode material for a lithium-ion battery. According to the method, a layer of TiO2 coats the surfaces of carbon particles by adopting a sol-gel method, so that the compaction density of the negative electrode material is improved by using high mechanical strength (about five times that of carbon) of a TiO2 coating layer. Compared with the means, such as material selection, pressing and particle size distribution in the prior art, the method disclosed by the invention has the advantages that the surface hardness ofgraphite particles can be changed and the problem that a graphite soft rolling structure is easy to collapse is effectively solved, thereby greatly improving the compaction density of the graphite.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to a method for preparing a high-pressure compacted negative electrode material for a lithium ion battery. Background technique [0002] In the prior art, considerations for the preparation of high-pressure negative electrode materials for lithium-ion batteries are based on the following points: [0003] (1) From the consideration of material selection, choose natural graphite with high compaction density or use composite graphite; [0004] (2) Learn from the isostatic pressing technology of the carbon industry to densify graphite materials to increase the compaction density; [0005] (3) Graphite particles with different particle size distributions are reasonably matched to increase the compaction density. [0006] Although the above three measures can increase the compaction density of the graphite negative electrode, the improvement range is limited, and the present invention is...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M10/0525H01M10/058
CPCH01M4/043H01M4/36H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈勇勇杨万光江船
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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