▎ 摘　　要

NOVELTY - Preparing three-dimensional hierarchical nitrogen-doped graphene microsphere material comprises (1) adding sulfonated polystyrene balls and graphene oxide into water for ultrasonic treatment to obtain a uniform solution, adding dicyandiamide and stirring quickly; (2) importing the obtained mixed solution into spray drying device, and drying to obtain a precursor material; and (3) subjecting obtained precursor material to thermal insulation heat treatment and cooling under a certain temperature condition in an inert atmosphere, obtaining three-dimensional hierarchical nitrogen-doped graphene microsphere material. USE - The graphene microsphere material is useful in sulfur-carbon composite material used for preparation of anode materials for lithium-sulfur battery or sodium-sulfur battery (claimed). ADVANTAGE - The graphene microsphere material: has a rich pore structure, which is conducive to electrolyte penetration; can improves storage and transport of lithium (sodium) ions, and nitrogen-doped graphene matrix can actively inhibits the ''polysulfide shuttle'' through multiple physical confinement, at same time, doping of heteroatom nitrogen can actively improve the conductivity of the material and enhance the adsorption capacity of the substrate for polysulfides, and actively improves the overall electrochemical performance of the material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: Three-dimensional hierarchical nitrogen-doped graphene microsphere material is prepared by above mentioned method. Sulfur-carbon composite material comprising three-dimensional hierarchical nitrogen-doped graphene microsphere material and sulfur.