▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene composite material supporting single layer of flower-shaped nanosheets comprises e.g. (i) placing the precursor in the hydrogen fluoride solution and stirring continuously to make the reaction uniform until the reaction is complete, (ii) centrifugally washing the obtained solution to neutrality and then dispersing into the Tetramethylammonium hydroxide solution, (iii) centrifugally washing the obtained solution under inert gas protection and subjecting to ultrasonic wave treatment, freezing the product at low temperature, transferring into the freeze dryer, and freeze-drying at ultra-low temperature for more than 72 hours, and (iv) treating the obtained powder sample by spray drying method, blending with graphene oxide, stirring and dispersing uniformly, then adding reducing agent and heating to obtain three-dimensional graphene composite material, and freeze-drying to obtain final product. USE - The composite material is useful as electrode material of lithium-sulfur battery (claimed). ADVANTAGE - The composite material: modifies the anode of lithium-sulfur battery, and has excellent high-load performance and cycle stability. DETAILED DESCRIPTION - Preparing three-dimensional graphene composite material supporting single layer of flower-shaped MXene nanosheets comprises (i) placing the precursor MAX in the hydrogen fluoride solution and stirring continuously to make the reaction uniform until the reaction is complete, (ii) centrifugally washing the obtained solution to neutrality and then dispersing into the Tetramethylammonium hydroxide solution, (iii) centrifugally washing the obtained solution under inert gas protection and subjecting to ultrasonic wave treatment, freezing the product at low temperature, transferring into the freeze dryer, and freeze-drying at ultra-low temperature for more than 72 hours, and (iv) treating the obtained powder sample by spray drying method, blending with graphene oxide, stirring and dispersing uniformly, then adding reducing agent and heating to obtain three-dimensional graphene composite material loaded with MXene, and freeze-drying to obtain final product. An INDEPENDENT CLAIM is also included for three-dimensional graphene composite material supporting single layer of flower-shaped nanosheets obtained by above method.