▎ 摘　　要

NOVELTY - Preparing metal-doped porous carbon fiber/graphene composite material with interconnected macropores involves adding graphene oxide into first treatment liquid, carrying out ultrasonic treatment, dispersing ultrasonically to obtain a graphene oxide dispersion liquid, adding nitrate and melamine into the obtained graphene oxide dispersion liquid, stirring, and adding polyvinylpyrrolidone. USE - Method for preparing metal-doped porous carbon fiber/graphene composite material with interconnected macropores. ADVANTAGE - The method improves electrochemical performance, cobalt salt, iron salt, nickel salt, etc, can also be added to the spinning solution to form single-atom doping and promote the catalytic conversion reaction of lithium-sulfur battery. DETAILED DESCRIPTION - Preparing metal-doped porous carbon fiber/graphene composite material with interconnected macropores involves adding graphene oxide into first treatment liquid, carrying out ultrasonic treatment, dispersing ultrasonically to obtain a graphene oxide dispersion liquid, adding nitrate and melamine into the obtained graphene oxide dispersion liquid, stirring, adding polyvinylpyrrolidone, stirring for 3-6 hours, adding the polytetrafluoroethylene emulsion after fully dissolving, stirring for 1-3 hours, performing electrostatic spinning under the voltage of 18-25 kilovolt and the glue pushing speed of 0.5-2 ml/hours, drying to obtain dry fiber, pre-oxidizing the obtained dry fiber in a tubular furnace at 180-250degrees Celsius to obtain a stable carbon fiber structure, and heating at 800-1000degrees Celsius in argon atmosphere to volatilize the polytetrafluoroethylene at high temperature, leaving a cavity in the carbon fiber, and forming a stable chemical structure by the metal atom and the nitrogen atom at high temperature to obtain the metal-doped porous carbon fiber/graphene composite material. DESCRIPTION OF DRAWING(S) - The drawing a scanning electroscope microscope image of the cobalt-doped porous carbon fiber/graphene-3 composite material.