▎ 摘　　要

NOVELTY - A lithium ion battery nitrogen-doped graphene/lithium iron phosphate composite material is prepared by dispersing lithium source, phosphorus source, iron source and carbon source into deionized water to prepare dispersion, adding citric acid, adjusting pH value using ammonia water to 11, uniformly stirring, heating in water bath, stirring, and calcining under ammonia atmosphere. USE - The method is used for preparing lithium ion battery nitrogen-doped graphene/lithium iron phosphate composite material used as positive electrode material. ADVANTAGE - The method is suitable for industrial scale production and has simple technique. The material is stable and has excellent conductivity.