▎ 摘　　要

NOVELTY - The preparation method of nitrogen doped graphene composite lithium-iron-phosphate cathode material involves uniformly dispersing graphite oxide in deionized water, adding nitrogen, stirring, dispersing iron source, phosphoric acid and lithium source in deionized water, stirring, obtaining uniform and stable dispersion liquid, mixing dispersion, stirring, drying in a freeze-dried condition, obtaining a solid mixture, precalcining the solid mixture under an inert gas atmosphere for 2-10 hours to obtain a reaction precursor and roasting the precursor under inert gas atmosphere. USE - Preparation of nitrogen doped graphene composite lithium-iron-phosphate cathode material for lithium ion battery. ADVANTAGE - The method prepares nitrogen doped graphene composite lithium-iron-phosphate cathode material by simple and short process at low cost. DETAILED DESCRIPTION - The preparation method of nitrogen doped graphene composite lithium-iron-phosphate cathode material (LiFePO4) involves uniform dispersing graphite oxide in deionized water, adding nitrogen, stirring for 1-10 hours, dispersing iron source, phosphoric acid and lithium source in deionized water, stirring, obtaining uniform and stable dispersion liquid, mixing dispersion, stirring for 10-48 hours, drying in a freeze-dried condition, obtaining a solid mixture, precalcining the solid mixture at 200-500 degrees C under an inert gas atmosphere for 2-10 hours to obtain a reaction precursor and roasting the precursor at 500-800 degrees C under inert gas atmosphere for 1-24 hours.