| abstract |
PROBLEM TO BE SOLVED: To provide a positive electrode active material having good thermal stability and high charge / discharge capacity when used for a positive electrode of a nonaqueous electrolyte secondary battery, and a method for producing the same. A general formula: [Li] 3a [Ni 1 -xyz Co x Mn y Li z] 3b [O 2] 6c ( where the next subscript represents the site []) represented by It is composed of a lithium metal composite oxide, and z is the mixing ratio of Li into the 3b site obtained from the Rietveld analysis of X-ray diffraction, and 0 ≦ x ≦ 0.25-3z, 0.15 + 2z ≦ y ≦ 0. 35 + 2z, z ≦ 0.05, the mixing ratio of metal elements other than Li to the 3a site is 0.05 or less, and the molar ratio 2w of Li in the lithium compound existing on the surface is 0 <2w It is a positive electrode active material for nonaqueous electrolyte secondary batteries that satisfies ≦ 0.10. [Selection] Figure 2 |