Patent ID: 8460822

Claim:
A positive electrode active material for a non-aqueous electrolyte secondary battery, the positive electrode active material comprising a composite oxide containing lithium and metal M other than lithium, M containing Ni, Mn, and Co, the molar ratio of Ni to the total of Ni, Mn, and Co being from 0.45 to 0.65, the molar ratio of Mn to the total of Ni, Mn, and Co being from 0.15 to 0.35, the positive electrode active material being prepared by coprecipitation with inert gas being bubbled during the coprecipitation or with oxygen being removed during the coprecipitation, the positive electrode active material having a pressed density under a compression of 60 MPa of 3.3 g/cm 3 or more and 4.3 g/cm 3 or less, and the positive electrode active material having a volume resistivity under a compression of 60 MPa of 100 Ω·cm or more and less than 1000 Ω·cm.