Positive electrode active material and non-aqueous electrolyte secondary battery

Abstract

A positive electrode active material comprises a first active material, and a second active material having a greater average particle size than the first active material. Each of the first active material and the second active material is a lithium-(transition metal) composite oxide. The first active material is a single particle, or a secondary particle consisting of 2 to 10 primary particles aggregated together. The second active material is a secondary particle consisting of at least 50 primary particles aggregated together. A ratio (R/D150) of an average particle size (R) of the single particle or the primary particle of the first active material determined in a scanning electron microscope image to an average particle size (D150) of the first active material is 0.80 or more. An intensity ratio (I003/I104) of diffraction peaks of the first active material obtained by an X-ray diffraction method is 1.6 or more.

Dependencies are inferred from the claim text.