▎ 摘　　要

NOVELTY - A graphene-sulfide composite cathode material preparation method involves preparing a transition metal tin compound/graphene composite material, and dissolving manganese chloride in deionized water to obtain solution. The composite material is added to the obtained solution followed by completely stirring and dispersing the mixture to obtain mixed solution. Sodium sulfide is added to the mixed solution followed by heating and reacting. The resulting product is cooled to obtain a solid product. The solid product is alternately and repeatedly washed and dried. USE - Method for preparing graphene-sulfide composite cathode material that is utilized in a lithium-ion battery. ADVANTAGE - The method enables preparing graphene-sulfide composite cathode material with high capacity, high conductivity and high cycle stability. DETAILED DESCRIPTION - A graphene-sulfide composite cathode material preparation method involves preparing a transition metal tin compound/graphene composite material and dissolving manganese chloride in deionized water to obtain solution. The transition metal tin compound/graphene composite material is added to the obtained solution followed by completely stirring and dispersing the mixture to obtain mixed solution. Sodium sulfide is added to the mixed solution, and the mixed solution is reacted by heating in a sealed condition for 10-20 hours at 250-300 degrees C. The resulting product is cooling to room temperature to obtain a solid product. The solid product is alternately and repeatedly washed with deionized water and ethanol, and the washed product is dried to obtain cathode material.