Preparation method of silicon alloy-graphene composite negative electrode material

A graphene composite and negative electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of limited improvement of cycle performance, reduction of cycle performance of silicon materials, collapse of material structure, etc., to improve conductivity and cycle stability High performance, good cycle stability, and long service life

Inactive Publication Date: 2013-06-12
深圳国安电气科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low initial Coulombic efficiency and extremely poor cycle performance of silicon materials limit its practical application.
To sum up, there are three main reasons that prevent silicon-based materials from being used as anode materials for lithium-ion batteries: first, the serious volume effect of silicon in the process of charging and discharging cycles leads to the collapse of the material structure; The irreversible transformation from the crystalline state to the disordered state causes serious damage to the structure of the material; third, the poor electrical conductivity of silicon, and the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to the preparation of Si 2.05 co 0.15 mn .0.23 Zn 0.56 Mg 0.22 Si, Co, Mn, Zn and Mg powders in the proportion required for the material were put into a ball milling jar with a ball-to-material ratio of 10:1. The ball milling jar was filled with high-purity nitrogen and sealed at 600 rpm for 20 hours to obtain a multi-element silicon alloy.

[0016] At 0°C, under an ice bath, disperse an appropriate amount of graphite powder into 70wt% concentrated sulfuric acid according to the ratio of dispersing 1g of graphite powder into 30mL of concentrated sulfuric acid with a concentration of 70wt%, and add KMnO with 3.5 times the mass of graphite under stirring. 4 , keep the temperature below 10°C, continue to stir for 1 hour, change the ice bath to an oil bath, add deionized water 30 times the mass of graphite, the temperature of the mixture rises during the reaction, maintain the temperature of the mixture at 80°C, and add a mass concentration of 30% H 2 o 2 , ...

Embodiment 2

[0020] According to the preparation of Si 2.05 co 0.15 mn .0.23 Zn 0.56 Mg 0.22 Si, Co, Mn, Zn and Mg powders in the proportion required for the material were put into a ball milling jar with a ball-to-material ratio of 15:1. The ball milling jar was filled with high-purity nitrogen and sealed at 750 rpm for 10 hours to obtain a multi-element silicon alloy.

[0021] At 0°C, under an ice bath, disperse an appropriate amount of graphite powder into 70wt% concentrated sulfuric acid according to the ratio of dispersing 1g of graphite powder into 40mL of concentrated sulfuric acid with a concentration of 70wt%, and add KMnO with 4 times the mass of graphite under stirring. 4 , keep the temperature below 10°C, continue to stir for 2 hours, change the ice bath to an oil bath, add deionized water 40 times the mass of graphite, the temperature of the mixture rises during the reaction, maintain the temperature of the mixture at 90°C, and add a mass concentration of 30% H 2 o 2 , r...

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PUM

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Abstract

The invention relates to a preparation method of a silicon alloy-graphene composite negative electrode material. The preparation method comprises the following steps of: (1) putting Si, Co, Mn, Zn and Mg powder into a ball-milling tank according to proportions of the Si, Co, Mn, Zn and Mg powders needed for a Si2.05Co0.15Mn0.23Zn0.56Mg0.22 material, and carrying out ball-milling to obtain multielement alloy silicon; (2) preparing high-purity nanometer graphene by using graphite powder; and (3) mixing the silicon alloy and the high-purity nanometer graphene, and carrying out ball-milling to obtain the product. According to the silicon alloy-graphene composite negative electrode material prepared by the method for lithium-ion batteries, the silicon and the multiple metals are prepared into the multielement alloy silicon so as to increase the electric conductivity and cycling stability of the silicon alloy, then the multielement alloy silicon is composited with the high-purity nanometer graphene so as to achieve good cycling stability. When being used in the lithium-ion batteries, the composite material has high capacity and long service life.

Description

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Claims

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Application Information

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Owner 深圳国安电气科技开发有限公司
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