The invention discloses a method for modifying a
phosphate-coated
lithium-rich
manganese-based
cathode material and belongs to the field of
lithium ion battery
cathode materials. The method comprisescoating steps of: 1) uniformly dispersing a prepared
lithium-rich
cathode material in a
mixed solution of deionized water and an
organic solvent to obtain a solution A; 2) dissolving
gadolinium nitrate and
phosphate in the deionized water to prepare solutions B and C; 3) adding the solutions B and C to the solution A under a room-temperature stirring state, and adjusting the pH value of the solution to 8 to 11 in order that the solutions B and C react and are in-situ deposited onto the surface of the lithium-rich material; 4) stirring and
ageing the solution for 2 to 5 hours, performing
oil bath evaporation to
dryness and performing
grinding to obtain a coated precursor; and 5) calcining the coated precursor in an
atmosphere at 450 to 600 degrees centigrade for 4 to 6 hours, and naturallycooling the coated precursor to
room temperature to finally obtain the GdPO4-coated lithium-rich
manganese-based
cathode material. The method uses the wet
chemical deposition method to in-situ coat the surface of the lithium-rich
manganese-based
cathode material with the GdPO4, is easy to operate, inhibits the
corrosion of the surface of the material by an
electrolyte, stabilizes the structure ofthe material, reduces
oxygen loss, and has wide application prospects.