Patent ID: 8318357

Claim:
A positive electrode active material for a non-aqueous electrolyte secondary battery, comprising a powder of a lithium nickel composite oxide represented by the general formula: Li 1-x Na x Ni 1-y Me y O 2 , where Me is at least one element selected from the group consisting of Co, Mn, Fe, Cu, Al, Mg, Ti, Zr, Ce, and Y, 0<x≦0.05, and 0≦y≦0.34, said positive electrode active material including primary particles having a median diameter of 3 μm or more and 13 μm or less, and said powder having a volume resistivity of 20 Ω·cm or more and 100 Ω·cm or less when said powder has a bulk density of 3 g/cm 3 .