▎ 摘　　要

NOVELTY - Diaphragm middle layer material comprises graphene nanosheet loaded with metal nitride. The diaphragm middle layer material is set towards one side of cathode of lithium-sulfur battery. The graphene nanosheet is carried on base film of diaphragm. The metal nitride is towards one side of cathode. The thickness of interlayer material of membrane is 8-12 mu m. The surface load is 1.0-3.0 mg/cm2. USE - Diaphragm middle layer material used for lithium-sulfur battery (claimed). ADVANTAGE - The diaphragm material has thickness of 8-12 microns and surface load is 1.0-3.0 mg/cm2. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing diaphragm middle layer material; and (2) a lithium-sulfur battery, which comprises negative electrode of lithium-sulfur battery, which is lithium, and positive electrode, which is sulfur/carbon composite, and lithium-sulfur battery further comprises lithium-sulfur battery separator.