▎ 摘　　要

NOVELTY - A graphene-based porous carbon sheet material is obtained by distributing porous carbon sheet on the upper and lower surfaces of the graphene layer, and doping carbon sheet of graphene-based porous material with cobalt nitrogen, where the graphene-based porous carbon sheet material has two-dimensional sheet structure. USE - Graphene-based porous carbon sheet material for use in lithium sulfur battery (claimed). ADVANTAGE - The graphene-based porous carbon sheet material has better electronic conductivity, physical and chemical adsorption effect, and suppresses the shuttle effect of polysulfide ions in the battery, and can improve utilization rate of active sulfur, improve the cycle stability and electrochemical performance of battery. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for preparing a graphene-based porous carbon sheet material, which involves adding graphene oxide solution to a methanol solution, uniformly dispersing ultrasonic waves, and adding polyvinylpyrrolidone, stirring uniformly to obtain a mixed solution 1, dissolving zinc nitrate hexahydrate and cobalt nitrate hexahydrate into the mixed solution 1 and stirring for 1-5 hours to obtain a mixed solution 2, adding methanol solution of 2-methylimidazole into the above mixed solution 2, stirring to produce a precipitate, standing for 5-8 hours, centrifuging, precipitating to remove impurities, and freeze-drying the obtained precipitate for 24-72 hours to obtain intermediate product, and calcining intermediate product at 700-1200?0C for 1-6 hours in a protective gas atmosphere to obtain the finished product (2) a use of graphene-based porous carbon sheet material (3) a lithium-sulfur battery.