▎ 摘　　要

NOVELTY - Nitrogen-doped graphene coated nano-sulfur anode composite material, comprises a three-dimensional conductive network formed by nitrogen-doped graphene overlapped with each other, and nitrogen-doped graphene sheets wrapped uniformly with nano-sulfur particles. USE - The nitrogen-doped graphene coated nano-sulfur anode composite material is useful in making lithium-sulfur batteries (claimed). ADVANTAGE - The nitrogen-doped graphene coated nano-sulfur anode composite material: provides the lithium-sulfur battery having a discharge capacity rate at 0.2C of greater than or equal to 1200 mAh.g-1, a discharge capacity rate at 1C of greater than or equal to 1000 mAh.g-1, a discharge capacity rate at 2C of greater than or equal to 800 mAh.g-1, a discharge capacity rate at 5C of greater than or equal to 600 mAh.g-1, a rate at 2C of less than or equal to 2000 cycles, and a decay capacity rate of less than or equal to 0.028% for each cycle; is free of conductive additive (all claimed); exhibits high capacity, high cycle stability, high rate performance and high conductivity; and inhibits the dissolution and shuttle effects of lithium-sulfur batteries. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the nitrogen-doped graphene coated nano-sulfur anode composite material, comprising dispersing the nitrogen-doped graphene in a liquid phase reaction system containing at least a sulfur source and acid, and depositing nano-sulfur particles by in situ chemical reaction of sulfur source and the acid to prepare the nitrogen-doped graphene coated nano-sulfur composites; and (2) a lithium-sulfur battery, comprising an anode, a cathode and an electrolyte, where the anode is the nitrogen-doped graphene coated nano-sulfur anode composite material.