▎ 摘　　要

NOVELTY - Preparation of positive electrode side separator material involves preparing polyacrylonitrile nanofiber membrane by electrospinning, hot-pressing, performing pre-oxidation and carbonization to obtain carbon nanofiber membrane, using mixed aqueous solution of cobalt salt and thiourea as electrodeposition solution, using three-electrode electrodeposition system to electrodeposit cobalt sulfide nanosheets on carbon nanofiber membrane electrodes, obtaining cobalt sulfide doped carbide film, using a mixed aqueous solution of graphene oxide and lithium perchlorate as the electrodeposition solution, using a three-electrode electrodeposition system to electrodeposit and reduce graphene oxide on cobalt sulfide doped carbide film electrodes, using aqueous solution of lithium perchlorate as the electrolyte, and using a three-electrode system to further reduce the graphene oxide deposited on cobalt sulfide. USE - Preparation of positive electrode side separator material for lithium-sulfur batteries (claimed). ADVANTAGE - The method produces separator material, which can efficiently intercept and adsorb polysulfides. The separator material can trap polysulfides and alleviate the shuttle effect of lithium-sulfur batteries, and catalyzes the conversion of polysulfides and prevents the transfer of positive electrode to negative electrode of the lithium-sulfur battery, thereby alleviating the shuttle effect of the lithium-sulfur battery and improving the battery performance and cycle life. The lithium-sulfur battery with the membrane as the separator has excellent energy storage performance. The lithium-sulfur battery has initial discharge specific capacity of 942.7 mAhg1 at a current density of 1.0 C, capacity loss rate per cycle after 150 cycles of 0.02%, and coulombic efficiency of close to 100%.