▎ 摘　　要

NOVELTY - Preparation of cathode material involves adding graphene oxide into water to form an oxidized graphene suspension liquid, adding sodium benzenesulfonate into the suspension liquid to obtain the three-dimensional sulfur-doped graphene, adding sulfur-doped graphene and Ketjenblack (RTM: Electroconductive carbon black) into N-methylpyrrolidone to form a suspension liquid (s1), adding sulfur into N-methylpyrrolidone until sulfur is completely dissolved to form a suspension liquid (s2), mixing and stirring the suspension liquids and centrifuging, washing and drying the suspension. USE - Preparation of cathode material for three-dimensional lithium-sulfur battery (claimed). ADVANTAGE - The method provides cathode material for three-dimensional lithium-sulfur battery with reduced shuttle effect, and improved cycle life. DETAILED DESCRIPTION - Preparation of cathode material involves ultrasonically adding graphene oxide into water to form a oxidized graphene suspension liquid, adding sodium benzenesulfonate into the suspension liquid, and then transferring into a hydrothermal kettle to carry out hydrothermal reaction, washing with ethanol and water after the reaction is completed, then freezing and drying to obtain the three-dimensional sulfur-doped graphene, ultrasonically adding the obtained sulfur-doped graphene and the Ketjenblack (RTM: Electroconductive carbon black) into N-methylpyrrolidone to form a suspension liquid (s1), adding elemental sulfur into N-methylpyrrolidone until the elemental sulfur is completely dissolved to form a suspension liquid (s2), mixing and stirring the two suspension liquids and then slowly adding distilled water under stirring, centrifuging, washing and drying to obtain cathode material of three-dimensional lithium-sulfur battery.