Positive Electrode Active Material, Positive Electrode and Lithium Secondary Battery Comprising the Same, and Method for Manufacturing Positive Electrode Active Material

A method for manufacturing a positive electrode active material, comprising:

• preparing a lithium-rich manganese-based oxide represented by Chemical Formula 1;
• and
• forming a carbon material coating layer on a surface of the lithium-rich manganese-based oxide by mixing the lithium-rich manganese-based oxide and a carbon material,
• wherein a content of the carbon material coating layer ranges from 0.5 parts by weight to 10 parts by weight based on 100 parts by weight of the lithium-rich manganese-based oxide,
• wherein, in Chemical Formula 1, 1.00<a, 0≤b≤0.53, 0≤c≤0.10, 0.47≤d≤1.00, 0≤e≤0.20, and M is at least one of Al, B, Co, W, Mg, V, Ti, Zn, Ga, In, Ru, Nb, Sn, Sr or Zr.