High-nickel ternary positive electrode material precursor and preparation method thereof

The invention relates to a high-nickel ternary positive electrode material precursor and a preparation method thereof, and belongs to the field of nickel-cobalt-manganese ternary positive electrode material precursors. The chemical formula of the high-nickel ternary positive electrode material precursor is NixCoyMnz(OH)2, wherein x is more than or equal to 0.8 and less than 1, y is more than 0 and less than 0.2, z is more than 0 and less than 0.2, and x + y + z = 1. Through special setting of the pH value, high pH at the initial stage of the reaction, reduction of the pH after 2-6 h and corresponding adjustment of the dosage of a complexing agent, the morphology of precursor microspheres can be changed, especially the primary particle size of the precursor microspheres is reduced, the peak (101) in the precursor crystal structure XRD is enhanced, the peak intensity ratio I (101)/I (001) of the peak (101) to the peak (001) is greater than 0.8, and the high-nickel ternary positive electrode material prepared fr