PRECURSOR OF TRANSITION METAL OXIDE, PREPARATION METHOD THEREOF, LITHIUM COMPOSITE TRANSITION METAL OXIDE, AND POSITIVE ELECTRODE AND SECONDARY BATTERY INCLUDING THE SAME

Provided herein is a precursor of a transition metal oxide, including a core unit and a shell unit, wherein the core unit includes a compound of chemical formula 1 below, and the shell unit includes a compound of chemical formula 2 below. NiMnCoM[OH]A [Chemical formula 1] NiMnCoM′[OH]A [Chemical formula 2]