▎ 摘　　要

NOVELTY - Multifunctional lithium-sulfur battery separator includes a basic separator and a coating layer. The coating layer includes graphene oxide and a host material, and the host material is one of boron nitride, aluminum carbonitride, or molybdenum disulfide. USE - Multifunctional lithium-sulfur battery separator used as a material for lithium-sulfur batteries, where lithium-sulfur battery includes a positive electrode, a negative electrode, a separator, and an electrolyte, and positive electrode is an acetylene black-sulfur composite electrode, and the negative electrode is a metal lithium sheet, and electrolyte is a mixture of lithium bistrifluoromethanesulfonate imide, lithium nitrate, 1,3-dioxapentane and ethylene glycol dimethyl ether (claimed). ADVANTAGE - The multifunctional lithium-sulfur battery separator solves the problem of dispersibility of nanomaterials, and two nanomaterials are combined in an orderly manner, which more effectively inhibits the shuttle of polysulfides, and synergistically enhances the mechanical strength and heat resistance of the diaphragm. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a multifunctional lithium-sulfur battery separator, which involves: (A) preparing an aqueous solution of the host material with a concentration of 2.0-6.0 mg/ml and an aqueous solution of graphene oxide with a concentration of 2.0-11.5 mg/ml; (B) filtering the aqueous solution of the host material into a slurry shape, mixing with the aqueous solution of graphene oxide, and mixing the two uniformly by an auxiliary method to obtain a stable and dispersed functional slurry; and (C) coating functional slurry on the surface of one side of the base separator with a doctor blade, and drying to volatilize the solvent to obtain the multifunctional lithium-sulfur battery separator.