2. A method of manufacturing a positive electrode active material precursor for a non-aqueous electrolyte secondary battery, the method comprising:
a crystallization process performed in an atmosphere in which an oxygen concentration is less than or equal to 20 volume %, the crystallization process including crystallizing the positive electrode active material precursor including a nickel composite hydroxide particle, in a reaction solution including at least a mixed aqueous solution of a metal salt including nickel salt, an ammonium ion supplier, and an alkaline material, in which an ammonium ion concentration is greater than or equal to 5.0 g/L and a pH value is greater than or equal to 11.0 based on a liquid temperature of 50 °C.
active material precursor
ammonium ion concentration
greater than or equal to 5.0 g/L
g/L
active material precursor
pH value
greater than or equal to 11.0