▎ 摘　　要

NOVELTY - Preparing porous graphene involves oxidizing graphite raw material to obtain graphite oxide, adding potassium ferrate to graphite oxide, and performing secondary oxidation to obtain graphite oxide. The third oxidation of the graphene oxide is performed, after secondary oxidation by using Fenton reagent to produce nanopores on the surface of the graphene oxide sheet. The obtained nanopore-rich oxidation after third oxidation is subjected to a reduction reaction to obtain porous graphene. USE - Method for preparing porous graphene. ADVANTAGE - The method enables to prepare porous graphene which is used as a cathode material for a lithium ion battery, which exhibits excellent electrochemical performance in terms of energy density, charge and discharge rate.