▎ 摘　　要

NOVELTY - Method for surface modification of a negative electrode material involves (a) taking raw coke, crushing it to a particle size greater than or equal to 10 mm, and then after grinding and shaping, obtaining the raw coke with a particle size of D50 of 8-10 mu m, (b) taking silicon carbide and grinding to a particle size of 10-200 nm, (c) mixing the raw coke with D50 of 8-10 mu m in step (a) and silicon carbide with 10-200 nm in step (b) for 30-50 minutes, and fusing for 40-60 minutes to obtain a mixture, (d) taking the high softening point asphalt raw material and crushing it to D50 of 2-3 mu m, (e) granulating the mixture in step (c) and the high softening point asphalt raw material in step (d) according to the high softening point asphalt raw material ratio of 5-10 wt.% of particle size D50 of 2-3 mu m and continuously fusing for 20-40 minutes to obtain the coating material, and (f) graphitizing the coating material to obtain a finished product. USE - The method is used for a surface modification of a negative electrode material. ADVANTAGE - The method innovatively adds silicon carbide to the graphite negative electrode material to achieve the effect of double increasing the conductivity of the negative electrode material and the rate fast charging performance. DETAILED DESCRIPTION - Method for surface modification of a negative electrode material involves (a) taking raw coke, crushing it to a particle size greater than or equal to 10 mm, and then after grinding and shaping, obtaining the raw coke with a particle size of D50 of 8-10 mu m, (b) taking silicon carbide and grinding to a particle size of 10-200 nm, (c) mixing the raw coke with D50 of 8-10 mu m in step (a) and silicon carbide with 10-200 nm in step (b) for 30-50 minutes, and fusing for 40-60 minutes to obtain a mixture, (d) taking the high softening point asphalt raw material and crushing it to D50 of 2-3 mu m, (e) granulating the mixture in step (c) and the high softening point asphalt raw material in step (d) according to the high softening point asphalt raw material ratio of 5-10 wt.% of particle size D50 of 2-3 mu m and continuously fusing for 20-40 minutes to obtain the coating material, and (f) graphitizing the coating material to obtain a finished product, that is, a highly conductive graphite with amorphous carbon and graphene composite negative electrode material.