▎ 摘　　要

NOVELTY - Preparing three-dimensional porous graphene comprises grinding the coal hot solution catalytic residue, nano template agent, potassium hydroxide and nitrogen source to form mixture, heating the mixture to reaction temperature in inert atmosphere and reacting at constant temperature, then pickling, drying and grinding to obtain final product. USE - The three-dimensional porous graphene is useful as cathode material in lithium ion battery (claimed). ADVANTAGE - The method: produces graphene sheet, which is more stable, has nanoporous structure, high specific surface area and high pore volume characteristics, thus providing better transmission channels for lithium ions and more active sites, thus improving lithium storage performance; involves nitrogen doping and potassium hydroxide activation which introduces more defect sites, which is conducive to lithium storage and gives excellent specific capacity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for use of three-dimensional porous graphene in lithium ion battery.