▎ 摘　　要

NOVELTY - Preparing graphene modified cathode material comprises e.g. (i) dispersing graphene powder dispersed in solvent, or ethanol for preparing graphene dispersion liquid, adding silicon powder, continuously dispersing to obtain mixed solution, (ii) transferring the mixed solution to a hydrothermal reaction kettle reaction, (iii) taking out the material, drying, crushing, grinding and sieving to obtain mixture A, (iv) mixing the mixture A, graphite and auxiliary agent into supercritical fluid, and stirring uniformly to obtain the mixture B, (v) spray drying the obtained mixture B, and collecting powder, (vi) mechanically crushing the petroleum coke, crushing the obtained particles, (vii) adding petroleum coke into anhydrous carbon tetrachloride, stirring to dissolve to obtain mixture C, and (viii) adding anhydrous aluminum trioxide into a reaction kettle, adding anhydrous carbon tetrachloride to stirring to dissolve anhydrous alchlor, adding mixture C and stirring. USE - The method is useful for preparing graphene modified cathode material. ADVANTAGE - The method: is economical; and improves specific surface area and liquid absorption, structural stability and cycle performance. DETAILED DESCRIPTION - Preparing graphene modified cathode material comprises (i) dispersing graphene powder dispersed in solvent, or ethanol for preparing graphene dispersion liquid, adding silicon powder, continuously dispersing to obtain mixed solution, (ii) transferring the mixed solution to a hydrothermal reaction kettle reaction temperature at 150-250 degrees C for 10-14 hours, (iii) taking out the material, drying, crushing, grinding and sieving to obtain mixture A, (iv) mixing the mixture A, graphite and auxiliary agent into supercritical fluid, and stirring uniformly to obtain the mixture B, (v) spray drying the obtained mixture B, and collecting powder, (vi) mechanically crushing the petroleum coke, crushing the obtained particles till the grain diameter is 300-500 nm, (vii) adding 5-10 pts. wt. petroleum coke into 50-100 pts. wt. anhydrous carbon tetrachloride, stirring to dissolve to obtain mixture C, (viii) adding 20-40 pts. wt. anhydrous aluminum trioxide into a reaction kettle, adding 100-140 pts. wt. anhydrous carbon tetrachloride to stirring to dissolve anhydrous alchlor, adding mixture C and while stirring at 45-55 degrees C, and carrying out Friedel-Crafts reaction for 20 hours to obtain reaction solution, after 24 hours, adding 200-400 pts. wt. ethanol in final Four-gram reaction, washing, filtering and drying to obtain solid of porous carbon material, placing the porous carbon material in a carbonization furnace for carbonization treatment obtaining the nanometer porous carbon material, (ix) adding powder obtained in the step (v) to the nanoporous carbon material obtained in the step (viii) for kneading at 180-220 degrees C, and (x) calcinizing the kneaded powder.