▎ 摘　　要

NOVELTY - Functional separator is obtained by loading potassium phosphotungstic acid and graphene oxide on lithium-sulfur battery separator. USE - Functional separator used in lithium-sulfur battery (claimed). ADVANTAGE - The functional separator effectively inhibits shuttle effect of polysulfides and reducing production of lithium dendrites, where the separator has unique properties, which can effectively prevent the flow of polysulfide to the negative electrode of the lithium-sulfur battery and can improve coulombic efficiency and cycle stability of the battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing functional diaphragm, which involves: (A) mixing potassium phosphotungstic acid solution and graphene oxide dispersion; (B) vacuum filtering on lithium-sulfur battery diaphragm; and (C) vacuum drying to obtain the diaphragm material.