▎ 摘　　要

NOVELTY - Preparing lithium-sulfur battery involves dispersing 200-250 mg graphene in 40-60 mL deionized water and marking it as solution A, dissolving 180-220 mg ferric nitrate nonahydrate and 100-140 mg urea in 15-30 mL deionized water, stirring uniformly and adding into solution A drop by drop, then, cooling the resulting mixed solution to room temperature after hydrothermal reaction, and washing and lyophilizing the product, finally, obtaining iron nitide-reduced graphene oxide (Fe2N/N-rGO) composite material after heat treatment at 700-800 degrees C for 2-4 hours in ammonia atmosphere, dissolving the Fe2N/N-rGO composite material and binder polyvinylidene fluoride in N-methylpyrrolidone at a ratio of 9-12:1, mixing uniformly, coating on one side surface of Celgard 2320, vacuum drying, and pressing into a wafer with a punching machine to obtain a Fe2N/N-rGO diaphragm. USE - Method for preparing lithium-sulfur battery. ADVANTAGE - The method provides product, which has excellent electrochemical performance, high specific capacity, stable cycle performance and good rate performance. DETAILED DESCRIPTION - Preparing lithium-sulfur battery involves dispersing 200-250 mg graphene in 40-60 mL deionized water and marking it as solution A, dissolving 180-220 mg ferric nitrate nonahydrate and 100-140 mg urea in 15-30 mL deionized water, stirring uniformly and adding into solution A drop by drop, then, cooling the resulting mixed solution to room temperature after hydrothermal reaction, and washing and lyophilizing the product, finally, obtaining iron nitide-reduced graphene oxide (Fe2N/N-rGO) composite material after heat treatment at 700-800 degrees C for 2-4 hours in ammonia atmosphere, dissolving the Fe2N/N-rGO composite material and binder polyvinylidene fluoride in N-methylpyrrolidone at a ratio of 9-12:1, mixing uniformly, coating on one side surface of Celgard 2320, vacuum drying, pressing into a wafer with a punching machine to obtain a Fe2N/N-rGO diaphragm, where load of Fe2N/N-rGO on the diaphragm as 0.2000.30 mg/cm2, mixing and dissolving elemental sulfur, conductive auxiliary agent and binder polyvinylidene fluoride in N-methylpyrrolidone, crusing, coating on aluminum foil, vacuum-drying and pressing into a disk as a positive electrode with a punch, where sulfur loading of the positive electrode as 1.5-1.7 mg/cm2, using lithium film as negative electrode, and then the half-cell of the Celgard2320 coated with Fe2N/N-rGO composite material faced the positive electrode to assemble the half-cell, thus obtaining the product.