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A silicon-carbon negative electrode material for a lithium ion battery and a preparation process thereof

A technology for lithium-ion batteries and negative electrode materials, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of inability to maximize the performance of lithium-ion batteries, difficult to fully mix, and easy to break molecular chains. , to achieve superior specific capacity performance, improve compaction density and electrical conductivity, and reduce equipment investment costs.

Inactive Publication Date: 2018-12-25
河南新太行电源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode material is the key factor to improve the rate performance of lithium-ion batteries, and it is an important direction for the lightweight of the current power system. Compared with traditional graphite materials, silicon carbon negative electrodes have obvious advantages in terms of gram capacity. At present, the mixing method of traditional negative electrodes is mostly wet For the mixed process route, the particle size of the applied materials is generally large. If the binder is sodium carboxymethyl cellulose, its molecular chain is easy to break. For silicon carbon negative electrodes with high specific capacity, it is not easy to fully Mixing evenly does not reflect the advantages of high gram capacity of the material, and cannot maximize the performance of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First select the total weight: 41% of silicon carbon negative electrode, 1.0% of conductive carbon black, 0.5% of instant anionic sodium carboxymethyl cellulose, 0.5% of styrene-butadiene rubber, and 57% of deionized water.

[0023] Gradually disperse the selected instant anionic sodium carboxymethyl cellulose into the deionized water being stirred in the mixing tank for mixing, and prepare a thickener glue with a mass fraction of 1.0%, without circulating water, at a revolution of 10rpm , Disperse and stir at a speed of 1000rpm, and the stirring time is 20min; there is no need to vacuumize during the stirring process, and the materials around the stirring paddles are recovered in time after stirring;

[0024] Add an appropriate amount of silicon carbon negative electrode and conductive carbon black to another stirring pot, fully stir for 10 minutes at a speed of 8 rpm and disperse at 800 rpm, and then add 60% of the glue prepared in step (a) to rotate at 8 rpm, and rota...

Embodiment 2

[0028] First select the total weight: 45% of silicon carbon negative electrode, 0.5% of conductive carbon black, 1.0% of instant anionic sodium carboxymethyl cellulose, 0.5% of styrene-butadiene rubber, and 53% of deionized water.

[0029] Gradually disperse the selected instant anionic sodium carboxymethyl cellulose into the deionized water being stirred in the mixing tank for mixing, and prepare a thickener glue with a mass fraction of 2.0%, without circulating water, at a revolution of 25rpm , Disperse and stir at a speed of 1500rpm, and the stirring time is 40min; there is no need to vacuum during the stirring process, and the materials around the stirring paddles are recovered in time after stirring;

[0030] Add an appropriate amount of silicon carbon negative electrode and conductive carbon black to another stirring pot, fully stir for 10 minutes at a speed of 15 rpm and disperse at 400 rpm, and then add 60% of the glue prepared in step (a), rotate at 15 rpm, and rotate ...

Embodiment 3

[0034] First select the total weight: 48% of silicon carbon negative electrode, 0.5% of conductive carbon black, 0.5% of instant anionic sodium carboxymethyl cellulose, 0.5% of styrene-butadiene rubber, and 50.5% of deionized water.

[0035] Gradually disperse the selected instant anionic sodium carboxymethyl cellulose into the deionized water being stirred in the mixing tank for mixing, and prepare a thickener glue with a mass fraction of 3.0%, without circulating water, and at a revolution of 15rpm , Disperse and stir at a speed of 1200rpm, and the stirring time is 30min; there is no need to vacuum during the stirring process, and the materials around the stirring paddles are recovered in time after stirring;

[0036] Add an appropriate amount of silicon carbon negative electrode and conductive carbon black into another stirring pot, fully stir at a speed of 12 rpm and disperse at 600 rpm for 10 minutes and mix well, then add 60% of the glue prepared in step (a) and rotate at...

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Abstract

The invention discloses a silicon-carbon negative electrode material of a lithium ion battery and a preparation process thereof. The material contains, in percentage by weight, 41 to 48 percent of a silicon-carbon negative electrode, 0.5 to 1 percent of conductive carbon black, 0.5 to 1 percent of instant anionic sodium carboxymethylcellulose, 0.5 to 1.2 percent of butadiene styrene rubber and 50to 57 percent of deionized water. The specific energy of the lithium ion battery manufactured from the negative electrode material of the invention is obviously improved, and the rate discharge capacity is obviously improved.

Description

technical field [0001] The invention relates to the preparation of lithium-ion battery negative electrodes, in particular to a silicon-carbon negative electrode material suitable for lithium-ion batteries and a preparation process. Background technique [0002] In recent years, lithium-ion batteries have developed rapidly, and the application of power batteries has gradually shown increasing enthusiasm. The negative electrode material is the key factor to improve the rate performance of lithium-ion batteries, and it is an important direction for the lightweight of the current power system. Compared with traditional graphite materials, silicon carbon negative electrodes have obvious advantages in terms of gram capacity. At present, the mixing method of traditional negative electrodes is mostly wet For the mixed process route, the particle size of the applied materials is generally large. If the binder is sodium carboxymethyl cellulose, its molecular chain is easy to break. Fo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M4/04H01M10/0525
CPCH01M4/04H01M4/362H01M4/386H01M4/587H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 乔歌歌王亮张志锋尹亮
Owner 河南新太行电源股份有限公司
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