Positive electrode active material for non-aqueous electrolyte secondary cell and cell using the same

摘要

There is provided a positive electrode active material for a non-aqueous electrolyte secondary battery, comprising a composite oxide represented by the general formula (1): (Li1-xMx)a(Co1-yMy)bOc where lithium and cobalt are partly replaced with element M in the crystal structure of LiCoOc, wherein element M is at least one selected from the group consisting of Al, Cu, Zn, Mg, Ca, Ba and Sr, and 0.02<=x+y<=0.15, 0.90<=a/b<=1.10, and 1.8<=c<=2.2 are satisfied.