▎ 摘　　要

NOVELTY - Three-dimensional graphene magnesium (Mg) doped lithium magnesium phosphate (LiMnPO4) lithium ion battery cathode material comprises three-dimensional nitrogen-doped graphene, lithium hydroxide (LiOH), phosphoric Acid (H3PO4), manganese sulfate (MnSO4), magnesium sulfate (MgSO4) and citric acid, where the ratio of LiOH, H3PO4, MnSO4, MgSO4 and citric acid is 6:2:1.65-1.95:0.05-0.35:3-6. USE - Three-dimensional graphene Mg doped LiMnPO4 lithium ion battery cathode material. ADVANTAGE - The three-dimensional graphene Mg doped LiMnPO4 lithium ion battery cathode material facilitates the transmission and diffusion of electrons, and improves the rate performance of the cathode material and the actual specific capacitance of the lithium ion battery under the synergistic effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method of the three-dimensional graphene Mg doped LiMnPO4 lithium ion battery positive electrode material, which involves: (A) adding ethylene glycol solvent and three-dimensional nitrogen doped graphene into the reaction flask, and slowly adding LiOH and H3PO4; (B) adding MnSO4, MgSO4 and citric acid, heating to 40-60 degrees C, stirring at a constant speed for 20-40 minutes, and pouring the solution into the micro-reactor, and in the reactor heating box, heating to 160-200 degrees C, reacting for 8-15 hours, filtering, washing and drying; (C) placing solid product in an atmosphere resistance furnace with nitrogen gas, the heating rate is 2-8 degrees C/minute, the temperature is raising to 570-620 degrees C, and the heat preservation treatment is 2-4 hours; and (D) grinding the calcined product into fine powder to prepare a three-dimensional graphene Mg doped LiMnPO4 cathode material for lithium ion batteries.