Patent ID: 7972729

Claim:
A positive electrode material for a non-aqueous electrolyte secondary battery, comprising active material particles that comprise a lithium-containing manganese oxide represented by the general formula: Li 1+a Mn 2−x−a M x O 4+y where M is a transition metal element other than Mn, 0<x≦0.5, −0.2≦y≦0.5, and 0≦a≦0.33, wherein the molar ratio A of M to the total of Mn and M in the surface of the active material particles and the molar ratio B of M to the total of Mn and M in the whole active material particles satisfy the relations: A/B>1.0 and A≧0.3, wherein, in an X-ray diffraction analysis using CuKα radiation as an X-ray source, the intensity ratio of the largest peak of peaks attributed to an oxide of the transition metal element M to a peak around 2θ=36.4° is 0.25 or less, and the transition metal element M is at least one selected from the group consisting of Ni, Fe, Ti, Zr, and Cu.