POSITIVE ELECTRODE ACTIVE MATERIAL FOR A SECONDARY BATTERY

Disclosed is a cathode active material for secondary batteries, comprising at least one compound selected from the following Formula 1: xLiMO*yLiM'O*zLiPO(1) wherein M is at least one element selected from 1 period or 2 period metals having an oxidation number of +4; M' is at least one element selected from 1 period or 2 period metals having a mean oxidation number of +3; and 0.1≤x≤0.9, 0.1≤y≤0.9, 0