LITHIUM MANGANESE IRON CATHODE ELECTRODE MATERIAL AND PREPARATION METHOD THEREOF, MANGANESE IRON PHOSPHATE PRECURSOR AND PREPARATION METHOD THEREOF, AND LITHIUM-ION BATTERY

The present disclosure relates to the technical field of preparation of a lithium-ion cathode material, and discloses a lithium manganese iron phosphate cathode material and a preparation method thereof, a manganese iron phosphate precursor and a preparation method thereof, and a lithium-ion battery. The cathode material has a composition represented by Formula I: LiMnFeRPO/C, Formula I, where 0.1≤a≤0.5, 0≤b≤0.08, 0.9≤d≤1.2, and R is selected from at least one of Al, Mg, Ca, Sr, V, Cr, Y, Mo, Nb, B, Al, W, La, Sm, Co, Ni, Cu, Zn, Zr, and Ti. The cathode material has a volume resistivity ranging from 10 Ω·cm to 10Ω·cm. The cathode material includes specific doping elements and has a low volume resistivity. When the cathode material is used to prepare the lithium-ion battery, electrochemical performance of the lithium-ion battery can be effectively improved.