Preparation method of power type high-nickel ternary precursor

The invention relates to a preparation method of a power type high-nickel ternary precursor. The method comprises the following steps of: 1, preparing a mixed salt solution of Ni, Co and Mn, preparing a sodium hydroxide or potassium hydroxide solution as a precipitator, and preparing an ammonia water solution as a complexing agent; 2, adding a sodium hydroxide or potassium hydroxide solution, sodium chlorite, pure water and an ammonia water solution into a synthesis kettle I to prepare a base solution; 3, stirring and introducing inert gas, continuously adding the mixed salt solution, the complexing agent and the precipitant to carry out coprecipitation reaction, and enabling overflow liquid to flow to a concentration machine; when the particle size D50 grows to 4.5-6.5 microns, stopping liquid feeding, and transferring slurry of the first synthesis kettle and the concentration machine to a first aging tank; and transferring the slurry in the first aging tank into a second synthesis kettle, stirring, introduc