▎ 摘　　要

NOVELTY - Mechanochemical force method for preparing graphene-silicon oxygen carbon cathode material involves utilizing expanded graphite and silicon-containing biomass as raw material and phosphoric acid as catalyst. The expanded graphite is extruded and silicon-containing biomass is dried. The mass ratio of expanded graphite and silicon-containing biomass is (1-5):(5-20). The materials are subjected to high speed crusher to crush for 10-50 minutes, where the crushed material particles not less than 325 meshes. The crushed material particles are fully agitated and filtered to obtain the slurry. USE - Mechanochemical force method used for preparing graphene-silicon oxygen carbon cathode material (claimed). ADVANTAGE - The method enables to prepare graphene-silicon oxygen carbon cathode material that has specific capacitance, high conductivity and great cycle performance, improves the stability of charging and discharging, and requires short charging time. DETAILED DESCRIPTION - Mechanochemical force method for preparing graphene-silicon oxygen carbon cathode material involves utilizing expanded graphite and silicon-containing biomass as raw material and phosphoric acid as catalyst. The expanded graphite is extruded and silicon-containing biomass is dried. The mass ratio of expanded graphite and silicon-containing biomass is (1-5):(5-20). The materials are subjected to high speed crusher to crush for 10-50 minutes, where the crushed material particles not less than 325 meshes. The crushed material particles are fully agitated and filtered to obtain the slurry. The mass ratio of the phosphoric acid and slurry is 1:1-5. The slurry is put into a grinder for 24-48 hours to obtain a viscous carbohydrate mixture. The graphite is nanocrystallized and uniformly dispersed, where, the graphene and silica have a particle size of 20-50 nm. The mixture is agglomerated to be viscous sugar to obtain the slicing sheet. The slicing sheet is cured in the drying box at 120 degrees C for 24-48 hours. The graphene oxide is reduced into graphene and then carbonized for 2-3 hours at 450-500 degrees C. The obtained product is washed with water for recycling phosphoric acid. The 5% hydrochloric acid is added and then boiled. The solution is neutralized with 5% sodium hydroxide solution. The filtrate is removed to obtain wet carbon and the wet carbon is boiled by adding water to remove chlorine. The obtain product is dried in isolating air atmosphere and then calcined at 1300-1800 degrees C for 2-3 hours to produce the graphene-silicon oxygen carbon cathode material.