Preparation method of TiN-coated nickel-cobalt-aluminum ternary positive electrode material

The invention relates to the technical field of lithium ion battery preparation, in particular to a method for coating a modified nickel-cobalt-aluminum ternary positive electrode material. The preparation method of a TiN-coated nickel-cobalt-aluminum ternary positive electrode material comprises the following steps of: (1) preparing a mixed solution A from soluble nickel salt and cobalt salt; (2)dissolving sodium metaaluminate in ammonia water to prepare a mixed solution B of sodium metaaluminate and ammonia water; (3) adding the mixed solution A, the mixed solution B and a sodium hydroxidesolution into a reaction kettle for coprecipitation reaction to obtain a nickel-cobalt-aluminum ternary precursor material; (4) ball-milling and uniformly mixing the nickel-cobalt-aluminum ternary precursor material obtained in the step (3) and lithium hydroxide to obtain a nickel-cobalt-aluminum ternary positive electrode material; (5) treating the nickel-cobalt-aluminum ternary positive electrode material obtained in the