Method for preparing lithium ion battery carbon silicon anode material

A technology of lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that cannot meet the performance requirements of high-performance power lithium-ion batteries, and the effect is not ideal, and achieve rich pore structure and high relative area , Circulation improvement effect

Inactive Publication Date: 2012-09-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these materials can be improved to a certain extent in terms of cycle performance, the effect is still not ideal enough to meet the performance requirements of high-performance power lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 50g resorcinol is dissolved in the formaldehyde solution of 65ml (concentration 38%), add 6ml (molar concentration 0.05mol / L) Na 2 CO 3 and 130ml of deionized water, stirred evenly, sealed, put into a 40°C incubator and left to stand for 10 hours. Add 10 grams of nano-silica powder, stir evenly and ultrasonically disperse for 30 minutes. Then add 30 grams of ultra-fine graphite powder, stir evenly, seal it and put it into a thermostat at 50°C for one day, at 70°C for one day, and at 90°C for two days. Put the above gel into acetone solution, soak it for 3 days, take it out and dry it. Finally, carbonization is carried out under the mixed atmosphere of nitrogen (or inert gas) and carbon dioxide gas with a molar ratio of 1:1, the heating rate is 3°C / min, and the temperature is raised to 1100°C for 7 hours. After cooling down to room temperature, a nano-carbon-silicon composite material is obtained.

[0029] The negative electrode material prepared above is used as the...

Embodiment 2

[0031] 30g resorcinol is dissolved in the formaldehyde solution of 40ml (concentration 38%), add 4ml (molar concentration 0.05mol / L) Na 2 CO 3 and 160ml of deionized water, stirred evenly, sealed, put into a 40°C incubator and left to stand for 10 hours. Add 20 grams of nano-silica powder, stir evenly and ultrasonically disperse for 30 minutes. Then add 30 grams of ultra-fine graphite powder, stir evenly, seal it and put it into a thermostat at 50°C for one day, at 70°C for one day, and at 90°C for two days. Put the above gel into acetone solution, soak it for 3 days, take it out and dry it. Finally, carbonization is carried out in a mixed atmosphere of nitrogen (or inert gas) and carbon dioxide gas with a molar ratio of 1:1, and the heating rate is 3°C / min, and the temperature is raised to 1100°C for 5 hours at a constant temperature. After cooling down to room temperature, a nano-carbon-silicon composite material is obtained.

[0032] The negative electrode material prep...

Embodiment 3

[0034] 58.9g resorcinol is dissolved and in the formaldehyde solution of 70ml (concentration 38%), add 7ml (molar concentration 0.05mol / L) Na 2 CO 3 and 73ml of deionized water, stirred evenly, sealed, and put into a 40°C thermostat for 10 hours. Add 25 grams of nano-silica powder, stir evenly and ultrasonically disperse for 30 minutes. Then add 25 grams of ultra-fine graphite powder, stir evenly, and put it into a thermostat at 50°C for one day, 70°C for one day, and 90°C for two days after sealing. Put the above gel into acetone solution, soak it for 3 days, take it out and dry it. Finally, carbonization is carried out under the mixed atmosphere of nitrogen (or inert gas) and carbon dioxide gas with a molar ratio of 1:2, and the heating rate is 3°C / min, and the temperature is raised to 1100°C for 5 hours at a constant temperature. After cooling down to room temperature, a nano-carbon-silicon composite material is obtained.

[0035] The negative electrode material prepare...

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Abstract

The invention relates to a method for preparing a lithium ion battery carbon silicon anode material. The method includes that a sol formed by resorcinol and formaldehyde is used for mixing and coating nano silicon powders and superfine graphite powders to obtain a mixture, and the mixture is subjected to a carbonization. Compared with methods in prior art, by means of the method, the circularity of the carbon silicon anode material can be remarkably improved, and the specific capacitance of the carbon silicon anode material is improved.

Description

technical field [0001] The invention relates to a preparation method of a battery negative electrode material, in particular to a preparation method of a lithium ion battery carbon silicon negative electrode material. Background technique [0002] Graphite anode materials have been widely used in lithium-ion batteries due to their good cycle efficiency, small volume expansion of intercalated lithium, and long cycle life. However, its theoretical lithium storage capacity is low, with a theoretical capacity of 372mAh / g, which cannot meet the needs of high specific energy power lithium batteries. Therefore, the development of new high-certain-capacity electrode materials has become the key to improving the performance of lithium batteries. Silicon has the highest known theoretical lithium intercalation specific capacity, as high as 4200mAh / g (Li 22 Si 5 ). However, the volume expansion of silicon materials reaches 400% during the process of intercalating lithium, which caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395
CPCY02E60/122Y02E60/10
Inventor 沈军刘冬刘念平关大勇张志华
Owner TONGJI UNIV
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