▎ 摘　　要

NOVELTY - The preparation method of metal oxide/nitrogen-doped graphene composite electrode involves dispersing nitrogen-doped graphene in organic solvent and then mixing, adding metal salt to the mixture and then carrying out hydrothermal reaction, adding graphene oxide solution to the mixture and then performing hydrothermal reaction, slicing the mixture and drying. USE - The method is useful for preparation of metal oxide/nitrogen-doped graphene composite electrode, which is useful in lithium-ion battery or sodium-ion battery (claimed). ADVANTAGE - The method enables preparation of metal oxide/nitrogen-doped graphene composite electrode with excellent self-supporting property, density and electrochemical performance.