▎ 摘　　要

NOVELTY - Preparation of graphene/sulfur/prussian blue analog composite material comprises weighing sodium ferrocyanide decahydrate and polyvinylpyrrolidone, adding to hydrochloric acid solution, stirring, dropping cobalt chloride solution, stirring, adding to oven, heating to 80-90 degrees C for 10-12 hours, filtering, centrifugally washing precipitate with distilled water, and vacuum drying to obtain prussian blue analog; adding sulfur powder, mixing, adding to carbon disulfide solution, stirring, evaporating to dryness, centrifugally washing product with distilled water, and drying to obtain sulfur/prussian blue analog composite material; and diluting graphene aqueous suspension, ultrasonically dispersing, adding sulfur/prussian blue analog composite material and hydrazine hydrate, stirring, washing product with distilled water, and vacuum freeze-drying. USE - The method is for preparation of graphene/sulfur/prussian blue analog composite material used as positive electrode material for lithium-sulfur batteries (all claimed). ADVANTAGE - The material has first discharge capacity of as high as 850 mAh/g, capacity maintained at 900 mAh/g at 0.5C rate, and excellent rate performance.