Patent ID: 7700009

Claim:
A method for producing a positive electrode active material for a non-aqueous electrolyte secondary cell, the method comprising: an underwater kneading step of kneading lithium nickel composite oxide (Li x Ni 1-y M y O z , 0.9<x≦1.1, 0≦y≦0.7, 1.9≦z≦2.1, M including at least one selected from Al, Co, and Mn), lithium iron phosphorus composite oxide (LiFePO 4 ), a conductive carbon source, and water; a cleaning step of removing the water and an alkaline component remaining on the surface of the lithium nickel composite oxide from the mixture after the underwater kneading step; and a baking step of baking the mixture in a reduced atmosphere at 200 to 800° C.