▎ 摘　　要

NOVELTY - Preparing functional composite carbon nanofiber / graphene film involves configuring a dimethylformamide solution containing barium titanate nanoparticles and polyacrylonitrile, and heating the dimethylformamide solution until dissolved, spinning the nano-polyacrylonitrile fiber membrane by dissolving the homogeneous dimethylformamide solution in the electrostatic spinning equipment. The polyacrylonitrile fiber membrane prepared is sequentially oxidized in air and carbonized in an inert atmosphere to form a nanocarbon fiber membrane embedded with barium titanate nanoparticle. The nano carbon fiber membrane prepared is immersed in a graphene solution, and then thermally reduced in an inert atmosphere to obtain final product. USE - Method for preparing functional composite carbon nanofiber / graphene film used in a middle barrier layer of a lithium-sulfur battery (claimed). ADVANTAGE - The method enables to prepare functional composite carbon nanofiber / graphene film inhibits the polysulfideshuttle effect, improves the electrochemical performance of the lithium-sulphur battery.