Silicon-cobalt-carbon composite material for negative electrode of lithium ion battery and preparation method of silicon-cobalt-carbon composite material

A technology of lithium ion battery and carbon composite material is applied in the field of silicon-cobalt-carbon composite material for negative electrode of lithium ion battery and its preparation field, and can solve the problems of organic solvent unfavorable to operator's health, large equipment investment, large proportion of silicon, etc. , to achieve the effect of inhibiting poor bonding strength, small investment and good cycle life

Active Publication Date: 2016-07-06
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention has the following disadvantages: the proportion of silicon in the composite material is relatively large, which is 20-60%, resulting in high cost; the use of organic solvents is not conducive to environmental protection and the health of operators; a polytetrafluoroethylene liner is required Self-pressurized reactor, equipment investment is large

Method used

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  • Silicon-cobalt-carbon composite material for negative electrode of lithium ion battery and preparation method of silicon-cobalt-carbon composite material
  • Silicon-cobalt-carbon composite material for negative electrode of lithium ion battery and preparation method of silicon-cobalt-carbon composite material
  • Silicon-cobalt-carbon composite material for negative electrode of lithium ion battery and preparation method of silicon-cobalt-carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Formula: 2.91g of nano-silica powder (average particle diameter of 80nm), 2.91g of cobalt nitrate hexahydrate, 4.02g of citric acid monohydrate, and 8.73g of graphite powder (average particle diameter of 17um).

[0029] 1) Take the nano-silica powder of the recipe amount and add it to 30g deionized water, adopt 1200W power ultrasonic dispersion, and use ice-water mixture to cool at the same time, prevent the dispersion liquid from overheating, and obtain the nano-silica powder dispersion liquid;

[0030] 2) Add 10 g of deionized water to cobalt nitrate hexahydrate in the formula amount and stir to dissolve, then add it into the nano-silica powder dispersion, and mix evenly to obtain a mixed solution A;

[0031] 3) Add 10 g of deionized water to the citric acid monohydrate of the formula amount and stir to dissolve, then add it into the mixed solution A, and mix evenly to obtain the mixed solution B;

[0032] 4) Add the graphite powder of the formula amount into the mixe...

Embodiment 2

[0041] Formula: 1.455g of nano-silica powder (average particle size: 50nm), 2.91g of cobalt nitrate hexahydrate, 4.02g of citric acid monohydrate, and 8.73g of graphite powder (average particle size: 17um).

[0042] 1) Take 1.455g of nano-silica powder and add it to 50g of deionized water, and use 800W power for ultrasonic dispersion, while cooling with an ice-water mixture to prevent the dispersion from overheating, and obtain a nano-silica powder dispersion;

[0043] 2) adding the cobalt nitrate hexahydrate of the formula amount into the nano-silicon powder dispersion, stirring and dissolving to obtain the mixed solution A;

[0044] 3) Add the citric acid monohydrate of the formula amount into the mixed solution A, stir and dissolve to obtain the mixed solution B;

[0045] 4) Add the graphite powder of the formula amount into the mixed solution B and stir and mix evenly to obtain the mixed solution C;

[0046] 5) adjusting the pH=3 of the mixed solution C with ammonia water...

Embodiment 3

[0052] Formula: 2.91g of nano silicon powder (average particle size: 50nm), 4.365g of cobalt sulfate heptahydrate, 6.52g of citric acid monohydrate, 29.1g of graphite powder (average particle size: 17um).

[0053] 1) Take the nano-silica powder of the formula amount and add it to 50g deionized water, adopt 1000W power ultrasonic dispersion, and use ice-water mixture to cool at the same time, prevent the dispersion liquid from overheating, and obtain the nano-silica powder dispersion liquid;

[0054] 2) adding the cobalt nitrate hexahydrate of the formula amount into the nano-silicon powder dispersion, stirring and dissolving to obtain the mixed solution A;

[0055] 3) Add the citric acid in the formula amount into the mixed solution A, stir and dissolve to obtain the mixed solution B;

[0056] 4) Add the graphite powder of the formula amount into the mixed solution B and stir and mix evenly to obtain the mixed solution C;

[0057] 5) adjusting the pH=5 of the mixed solution C...

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Abstract

The invention discloses a silicon-cobalt-carbon composite material for a negative electrode of a lithium ion battery and a preparation method of the silicon-cobalt-carbon composite material. The preparation method comprises the following steps of uniformly dispersing nanometer silicon powder in water to obtain a nanometer silicon powder dispersing solution; adding a cobalt source into the nanometer silicon powder dispersing solution, dissolving the cobalt source, adding citric acid monohydrate, dissolving the citric acid monohydrate, adding graphite, and uniformly mixing the graphite to obtain a mixed solution; adjusting pH of the obtained mixed solution to be 2-5, precipitating a metal cobalt complex wrapping nanometer silicon powder particles from the surface of graphite powder particles to obtain a colloidal solution; carrying out drying and thermal processing on the obtained colloidal solution to obtain the silicon-cobalt-carbon composite material, wherein the mass ratio of the nanometer silicon powder to the cobalt source is (1:1) to (1:2), the mass ratio of the citric acid monohydrate to the cobalt source is (1:1) to (1:2), and the mass ratio of the nanometer silicon powder to graphite is (1:3) to (1:10). The silicon-cobalt-carbon composite material is environmental-friendly and is low in cost, the initial reversible capacity of the battery also can be effectively improved, and the cycle lifetime of the battery can be effectively prolonged.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a silicon-cobalt-carbon composite material for a lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] Carbon materials represented by graphite are currently the main body of negative electrode materials for commercial lithium-ion batteries, but their actual mass specific capacity is close to the theoretical value of 372mAh / g, and their volume specific capacity is low. The theoretical lithium storage capacity of Si has reached 4200mAh / g, which is much higher than the theoretical capacity of carbon materials. However, Si is a semiconductor material with low electrical conductivity. The volume expansion of silicon is large during the process of intercalation and extraction of lithium, and the cycle performance is poor. . How to improve the poor conductivity of silicon materials, volume expansion and reduce cycle l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/587H01M10/0525Y02E60/10
Inventor 刘文平秦海青张振军林峰卢宗柳雷晓旭张健伟卢安军蒙光海张莉丽
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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