▎ 摘　　要

NOVELTY - Preparation of iron oxide/nitrogen-doped graphene material involves adding dopamine hydrochloride to graphene oxide and hydrochloric acid at mass ratio of 1:0.5-1:5, adding trihydroxymethyl aminomethane to adjust pH to 8.5, reacting for 12-24 hours at room temperature, filtering, eluting with deionized water to neutral, and drying at 80 degrees C for 12 hours; and dispersing in iron salt precursor aqueous solution at mass ratio of 1:3-1:10, adding iron salt, adding 1 mol/L sodium hydroxide solution reacting at room temperature to 50 degrees C for 12-24 hours, filtering, and washing. USE - Method for preparing iron oxide/nitrogen-doped graphene material used for lithium ion battery cathode (claimed). ADVANTAGE - The lithium battery has excellent lithium properties. DETAILED DESCRIPTION - Preparation of iron oxide/nitrogen-doped graphene material comprises adding dopamine hydrochloride to graphene oxide and hydrochloric acid at mass ratio of 1:0.5-1:5, adding trihydroxymethyl aminomethane to adjust pH to 8.5, reacting for 12-24 hours at room temperature, filtering, eluting with deionized water to neutral, and drying at 80 degrees C for 12 hours; dispersing in iron salt precursor aqueous solution at mass ratio of 1:3-1:10, adding iron salt, adding 1 mol/L sodium hydroxide solution reacting at room temperature to 50 degrees C for 12-24 hours, filtering, washing by deionized water to neutral, and drying at 80 degrees C for 12 hours; and heating to 400-500 degrees C under protection of inert gas for 1-3 hours.