▎ 摘　　要

NOVELTY - Preparing graphene composite material comprises (i) preparing few-layer graphene using metal copper catalyst obtain copper/graphene composite material, (ii) placing the copper/graphene composite material into the reaction vessel, and adding acid solution into the reaction vessel, stirring and dissolving, gradually adding aqueous ammonia solution and keeping stirring continuously, stopping adding aqueous ammonia solution and stirring until no blue flocculent is generated, and sequentially hydroxide/graphene powder material is obtained after the deionized water of washing and freezing and drying, and (iii) placing the copper hydroxide/graphene powder material into mortar, adding elemental sulfur into the mortar, and grinding for 2-4 hours to obtain the mixture, (iv) placing the mixture into a tubular furnace filled with inert gas, heating the tubular furnace to 130-180℃ for 10-20 hours, cooling and grinding. USE - The method is useful for preparing graphene composite material. ADVANTAGE - The method has the effect of significantly reducing the single-turn attenuation rate, and improves the electrochemical performance while significantly improving product uniformity. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of preparing graphene composite material.