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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1,

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

[0023] The selected quick-dissolving anionic sodium carboxymethyl cellulose is gradually dispersed and mixed in the deionized water being stirred in the mixing tank to prepare a thickener glue with a mass fraction of 1.0%, without circulating water, and revolution at 10rpm , Disperse and stir at a speed of 1000 rpm, and the stirring time is 20 minutes; the stirring process does not need to be vacuumed, and the materials around the stirring paddle are recovered in time after stirring;

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

Example Embodiment

[0027] Example 2,

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

[0029] The selected quick-dissolving anionic sodium carboxymethyl cellulose is gradually dispersed into the deionized water being stirred in the mixing tank for mixing, and it is formulated into a thickener glue with a mass fraction of 2.0%, without circulating water, and rotating at 25rpm , Stirring at a speed of 1500rpm, the stirring time is 40min; the stirring process does not need to be vacuumed, and the materials around the stirring paddle are recovered in time after stirring;

[0030] Add appropriate amount of silicon-carbon negative electrode and conductive carbon black into another stirring pot, stir well for 10 minutes at a speed of 15 rpm and 400 rpm, and then add 60% of the glue prepared in step (a) at 15 rpm and rotate Stir at 800rpm for 15min, stop scra...

Example Embodiment

[0033] Example 3,

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

[0035] The selected quick-dissolving anionic sodium carboxymethyl cellulose is gradually dispersed into the deionized water being stirred in the mixing tank for mixing, and it is formulated into a thickener glue with a mass fraction of 3.0%, without circulating water, and rotating at 15rpm , Disperse at a speed of 1200rpm for stirring, and the stirring time is 30min; the stirring process does not need to be vacuumed, and the materials around the stirring paddle are recovered in time after stirring;

[0036] Add appropriate amount of silicon carbon negative electrode and conductive carbon black into another stirring pot, stir well for 10 minutes at a speed of 12 rpm and 600 rpm, and then add 60% of the glue prepared in step (a) at 13 rpm and rotate Stir at a speed ...

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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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