POSITIVE ELECTRODE ACTIVE MATERIAL FOR RECHARGEABLE LITHIUM BATTERY, POSITIVE ELECTRODE INCLUDING THE SAME, AND RECHARGEABLE LITHIUM BATTERY INCLUDING THE SAME

A positive electrode active material for a rechargeable lithium battery, a positive electrode including the positive electrode active material, and a rechargeable lithium battery including the positive electrode, are provided. The positive electrode active material includes: a first particle having an olivine crystal structure and having a first average particle diameter; a second particle having the olivine crystal structures and having a second average particle diameter smaller than the first average particle diameter; and a third particle having a layered crystal structure.