Patent ID: 8158283

Claim:
A positive electrode active material for a non-aqueous electrolyte-based secondary battery, consisting of lithium/nickel composite oxide powders obtained by water washing fired powders, in a slurry having a concentration of 500 to 50000 g/L, having the following composition formula (1), followed by filtering and drying: LiNi 1-a M a O 2 (1) wherein, M represents Al and Co; and “a” satisfies 0.01<a <0.5, characterized in that specific surface area of said lithium/nickel composite oxide powders after water washing is 0.3 to 2.0 m 2 /g wherein the fired powders having said composition formula (1) is prepared by firing a raw material mixture comprising nickel oxide obtained by roasting nickel hydroxide or nickel oxyhydroxide containing nickel, as a main component, and an aluminum compound and a cobalt compound, as a side component, and a lithium compound.