| abstract |
Disclosed is a positive electrode active material for a nonaqueous electrolyte secondary battery having at least a lithium-transition metal composite oxide of the spinel structure, n wherein the lithium-transition metal composite oxide exists in a form of particles consisting of one or both of primary particles and secondary particles that are aggregations of the primary particles, and n wherein assuming that each of the particles is given a two-dimensional coordinate having as coordinate components cubic roots of luminescence voltage values ascribable to a transition metal and lithium to represent the respective particles by points in a coordinate plane, and that a primary regression line passing an origin is obtained, a mean absolute deviation of an error of each of the points with respect to the primary regression line is 0.25 or less. By use of this positive electrode active material can improve for a nonaqueous electrolyte secondary battery, electrode characteristics, in particular cycle characteristics, load characteristics, storage characteristics and the like are excellent, and less swelling of the battery is caused. |