▎ 摘　　要

NOVELTY - Porous boron nitride fiber/reduced graphene oxide composite lithium-sulfur battery separator material comprises a structure of reduced graphene oxide coated porous boron nitride fiber, where the coated structure provide an effective conductive path for the positive electrode while alleviating the shuttle effect of lithium polysulfide. USE - Porous boron nitride fiber/reduced graphene oxide composite lithium-sulfur battery separator material. ADVANTAGE - The porous boron nitride fiber/reducing graphene oxide composite lithium-sulfur battery diaphragm material has excellent rate capability, capacity and cycle performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing porous boron nitride fiber/reduced graphene oxide composite lithium-sulfur battery separator material, which involves preparing porous boron nitride fibers, mixing porous boron nitride fiber and the graphene oxide aqueous solution and stirring until they are uniformly mixed to obtain a porous boron nitride fiber/graphene oxide composite material, treating the porous boron nitride fiber/graphene oxide composite material at a high temperature under nitrogen conditions at a high temperature of 800-1500 degrees C to obtain a porous boron nitride fiber/reduced graphene oxide composite material, mixing porous boron nitride fiber/reduced graphene oxide composite material and the binder and grinding and then coating on the main body of the diaphragm with a spatula and drying to obtain porous boron nitride fiber/reduced graphene oxide composite lithium sulfur battery separator material; and (2) a lithium-sulfur battery, which comprises a composite lithium-sulfur battery separator material having a high-potential positive electrode active positive electrode pole piece, a low-potential negative electrode lithium material, and the composite lithium-sulfur battery separator material separated between the negative electrode pole piece and the positive electrode pole piece, where the positive pole piece comprises sublimed sulfur, carbon black and polytetrafluoroethylene, the carbon black is used as a conductive agent, and the mass content is 15-30%, and the polytetrafluoroethylene is used as a binder, and the mass content is 5-10% and the rest is sublimated sulfur.