▎ 摘　　要

NOVELTY - The preparation of graphene-coated artificial graphite cathode material involves preparing graphene oxide aqueous solution, adding into stainless steel reactor, sealing reactor in blast oven, reacting, naturally cooling reactor, freeze-drying of graphene solution to obtain graphene, adding graphene into solvent to obtain graphene solution, adding artificial graphite powder, and binder to graphene solution to make mixed slurry of graphite and graphene, adding mixed slurry to fusion machine, carrying out fusion reaction to obtain fusion material, heat treating, and sieving. USE - Preparation of graphene-coated artificial graphite cathode material used in lithium-ion battery. ADVANTAGE - The method enables preparation of graphene-coated artificial graphite cathode material with high specific surface area, high rate performance, high specific capacity, and high cycle performance, and improves the conductivity of graphite. DETAILED DESCRIPTION - The preparation of graphene-coated artificial graphite cathode material involves preparing 0.5-10 mg/ml graphene oxide aqueous solution, adding into a stainless steel reactor, sealing stainless steel reactor in blast oven, reacting at 100-300 degrees C for 5-30 hours, naturally cooling stainless steel reactor at room temperature, freeze-drying of graphene solution to obtain graphene with specific surface area of 1500-2400 m2/g, adding graphene into solvent to obtain graphene solution, adding artificial graphite powder with diameter of 1-50 mu m, and binder to graphene solution to make mixed slurry of graphite and graphene, adding mixed slurry to the fusion machine, carrying out fusion reaction at speed of 20-200 rpm for 1-20 minutes to obtain fusion material, heat treating of fusion material at 800-2000 degrees C and rate of 5 degrees C/minute for 1-20 hours under inert gas protection, and sieving. The weight ratio of graphene and solvent is 1:(10-100). The solvent is water, methanol or ethanol. The weight ratio of artificial graphite, binder and graphene is 100:(1-30):(1-1). The binder is sodium carboxymethyl cellulose, polyvinyl alcohol, phenolic resin, epoxy resin, glucose, starch and asphalt.