Transition metal oxide precursor, method for preparing same, lithium composite transition metal oxide, positive electrode comprising same, and 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] Ni a MnbCo 1-(a+b+c) Mc[OH (1-x)2-y ]A (y/n). [Chemical formula 2] Ni a' Mn b' Co 1-(a'+b'+c') M' c' [OH (1-x')2-y' ]A' (y'/n).