Positive Electrode Active Material Precursor for Secondary Battery, Positive Electrode Active Material, and Lithium Secondary Battery Including the Same

The present invention provides a positive electrode active material precursor for a secondary battery which includes primary particles of CoOor Co0OH, wherein the primary particle contains a doping element in an amount of 3,000 ppm or more, and has an average particle diameter (D) of 15 pm or more, and a positive electrode active material for a secondary battery which includes particles of a lithium cobalt-based oxide, wherein the primary particle contains a doping element in an amount of 2,500 ppm or more, and has an average particle diameter (D) of 15 μm or more.