▎ 摘　　要

NOVELTY - A sulfur coated graphene/porous carbon composite anode material preparing method involves utilizing hydrothermal process, preparing graphene slurry by dispersing graphene sheet, followed by preparing sulfur/porous carbon composite material. The slurry is mixed with composite material and dispersed. The resultant slurry is added to hydro-thermal reaction kettle to carry out reaction to obtain an aqueous gel column to remove hydrogel column after rolling and extruding out of water, followed by soaking in water, drying, and grinding into powder, which vacuum-dried. USE - Method for preparing graphene coated sulfur/carbon composite anode material that is utilized as positive electrode material of lithium-sulfur secondary battery. ADVANTAGE - The method enables preparing the anode material with porous graded core-shell structure, high specific capacity, improved electrochemical property, long circulation life and good high-rate property. DETAILED DESCRIPTION - A sulfur coated graphene/porous carbon composite anode material preparing method involves utilizing hydrothermal process, preparing graphene slurry by dispersing graphene sheet in water uniformly, followed by preparing sulfur/porous carbon composite material comprising activated carbon, graphene, carbon black, carbon nanotube, template porous carbon, carbon fiber, carbon aerogel and carbide-derived carbon. The graphene slurry is mixed with sulfur/porous carbon composite material at a mass ratio of (0.2-20):1 and dispersed uniformly. The resultant slurry is added to hydro-thermal reaction kettle with polytetrafluoroethylene liner to carry out reaction at 100-220 degrees C for 1-24 hours to obtain an aqueous gel column to remove hydrogel column after rolling and extruding out of water, followed by soaking in water, drying at 20-90 degrees C for 1-24 hours, and grinding into powder. The powder is vacuum-dried at 20-90 degrees C for 1-24 hours to obtain a finished product, where the graphene slurry has water content of 90-99.99%, and the sulfur/porous carbon composite material comprises sulfur and porous carbon at a mass ratio of 1:(0.02-20).