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
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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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