Transition metal oxide precursor, method for preparing same, lithium composite transition metal oxide, positive electrode comprising same, and secondary battery

The invention discloses a transition metal oxide precursor, a method for preparing the same, a lithium composite transition metal oxide, a positive electrode comprising the same, and a secondary battery. Provided is a transition metal oxide precursor comprising a core part and a shell part, wherein the core part comprises a compound of chemical formula 1 below, and the shell part comprises a compound of chemical formula 2 below. [Chemical formula 1] NiaMnbCo1-(a+b+c)Mc[OH(1-x)2-y]A(y/n). [Chemical formula 2] Nia'Mnb'Co1-(a'+b'+c')M'c'[OH(1-x')2-y']A'(y'/n). 本发明提供种过渡金属氧化物的前体，所述前体包含核单元和壳单元，其中所述核单元包含下述化学式1的化合物，并且所述壳单元包含下述化学式2的化合物。[化学式1] NiMnCoM[OH]A[化学式2] NiMnCoM'[OH]A'。