ACTIVE MATERIAL OF POSITIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND PROCESS FOR PRODUCING THE SAME

摘要

A positive electrode active material for a non-aqueous electrolyte secondary battery includes a particle of a composite oxide which contains Li and Co, wherein: the composite oxide further contains an element M<1> and an element M<2>; the element M<1> is at least one selected from the group consisting of Mg, Cu and Zn; the element M<2> is at least one selected from the group consisting of Al, Ca, Ba, Sr, Y and Zr; the element M<1> is uniformly distributed in the particle; and the element M<2> is distributed in the surface portion of the particle more than in the inside thereof.