POSITIVE ELECTRODE ACTIVE MATERIAL, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING SAME

Provided is a positive electrode active material. The positive electrode active material includes: a small-diameter active material having an average particle diameter of about 0.5 µm and a maximum particle diameter of less than about 1 µm; and a large-diameter active material having an average particle diameter of about 5 µm to about 20 µm and a maximum particle diameter of less than about 100 µm.