PRODUCTION METHOD OF POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM-ION SECONDARY BATTERY

A production method of a positive electrode active material for a lithium-ion secondary battery includes a mixing step of mixing a nickel-containing material containing at least nickel, and a lithium compound, thereby preparing a raw material mixture; a firing step of firing the raw material mixture in an oxidative atmosphere, thereby obtaining a fired product; a water washing step of washing the fired product obtained in the firing step with water, thereby obtaining water-washed powder; a thermal treatment step of thermally treating the water-washed powder obtained in the water washing step; and a boron adding step of mixing thermally treated powder obtained in the thermal treatment step, and a boron-containing material that is at least one selected from a boron simple substance and a boron-containing compound.