Positive electrode active material for non-aqueous electrolyte secondary battery, method for producing positive electrode active material for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

Abstract

A positive electrode active material for a non-aqueous electrolyte secondary battery according to one embodiment comprises a lithium transition metal composite oxide represented by the compositional formula LiαNaβNi1-b-cMnbXcOd (where X is at least one element selected from metallic elements other than Li, Na, Ni, and Mn, 0.80≤α≤1.20, 0≤β≤0.05, 0.80≤α+β≤1.20, 0.25<b≤0.65, 0≤c≤0.1, 0.4≤1−b−c<0.75, and d is a value satisfying the valence), and the ratio I108/I110 of the integrated intensity I108 of the diffraction peak at the (108) plane to the integrated intensity I110 of the diffraction peak at the (110) plane of the x-ray diffraction pattern obtained by powder x-ray diffraction of the lithium transition metal composite oxide is I108/I110<0.4.

Dependencies are inferred from the claim text.