Cathode active material for non-aqueous electrolyte secondary battery and method of manufacturing cathode active material for non-aqueous electrolyte secondary battery

A method of manufacturing a cathode active material for a non-aqueous electrolyte secondary battery, the method comprising:

• a mixing process of mixing lithium nickel complex oxide particles, tungsten trioxide, and water to obtain tungsten mixture, the lithium nickel complex oxide particles including primary particles of a lithium nickel complex oxide represented by a general formula:
• LizNi1−x−yCoxMyO2+α (where 0<x≤0.35, 0≤y≤0.35, 0.95≤z≤1.20, −0.2≤α≤0.2, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al), and secondary particles in which the primary particles aggregate;
• and
• a heat treatment process of heat-treating the tungsten mixture,
• wherein the tungsten trioxide has a ratio of IWO2.90/IWO3.00 equal to or lower than 0.15, where IWO2.90 is a peak intensity of a (200) plane of WO2.90 and IWO3.00 is a peak intensity of a (200) plane of WO3.00 in an XRD pattern.