Positive Electrode Active Material Precursor, Preparation Method Thereof, Positive Electrode Active Material Prepared Using Same, Positive Electrode, and Secondary Battery

A positive electrode active material precursor is provided, which includes a transition metal hydroxide particle represented by Formula 1 and a cobalt oxide particle and a manganese oxide particle attached to the surface of the transition metal hydroxide particle. A preparation method thereof, a positive electrode active material prepared using the same, a positive electrode including the positive electrode active material, and a secondary battery including the positive electrode are also provided.