▎ 摘　　要

NOVELTY - Preparing iron-based composite nitrogen-doped graphene sodium ion battery cathode material, comprises (i) dispersing graphene oxide in N,N-dimethylformamide and treating to obtain dispersion, dissolving iron salt in the obtained dispersion, and stirring until the iron salt is completely dissolved to obtain precursor solution having uniform composition, (ii) pouring the precursor solution into a reaction kettle, heating and cooling it down, washing, drying, and annealing to obtain three-dimensional iron(III) oxide/nitrogen-doped graphene material, and (iii) grinding the iron(III) oxide/nitrogen-doped graphene material into powder, then adding into a microwave processing device, introducing gas, microwave processing, and cooling down to obtain iron(III) oxide/iron(II,III) oxide nitrogen-doped graphene nanoparticles. USE - The cathode material is useful for lithium-ion batteries, sodium-ion batteries, and other types of batteries.