The present application provides a precursor of a positive
electrode active material. A particle of the precursor comprises a core and a shell covering the core. The material of each of the core and the shell is
nickel cobalt manganese oxide or
nickel cobalt manganese hydroxide. The core is doped with a fluxing agent, and the fluxing agent is selected from one or more of oxides,
carbonic acid compounds, and hydroxides of Sr, Li, Mg, Ni, Co, and Zr. The shell is doped with a
reaction inhibitor. The
reaction inhibitor is selected from one or more of
lithium compounds, oxides,
carbonic acid compounds, hydroxides, and other compounds of Ta, W, Al, Mn, Mo, and La. A fluxing agent is disposed in the core of the particle of the precursor, and the
reaction inhibitor is disposed in the shell, so that subsequent
crystallization of the precursor develops from inside to outside. The present application further provides a positive
electrode active material and a preparation method therefor, a positive
electrode comprising the positive electrode active material, a
lithium-
ion battery, and a preparation method for the precursor.