▎ 摘　　要

NOVELTY - A cobalt and nitrogen dual-doped carbon and reduced graphene oxide composite material preparing method involves using a bimetallic organic skeleton material as a precursor, reacting and compounding zinc salt, cobalt salt and organic ligand on the surface of the graphene to obtain zinc/cobalt-bimetallic organic frame and graphene precursor, followed by calcining, pickling and drying. USE - Method for preparing cobalt and nitrogen dual-doped carbon and reduced graphene oxide composite material for use in lithium sulfur battery diaphragm (claimed). ADVANTAGE - The method enables preparing the composite material with good conductivity and specific surface area of 750-1000 m2/g, simple raw material, in a convenient manner. The material used in membrane-modified lithium sulfur battery can inhibit polysulfide shuttle effect, the practical specific capacity of lithium-sulfur battery and cycle performance, and realize large-scale production and commercialization of the lithium-sulfur battery system having a certain promoting function. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a use of the cobalt and nitrogen dual-doped carbon and reduced graphene oxide composite material in lithium sulfur battery diaphragm (2) a lithium sulfur battery diaphragm.