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

A positive electrode active material for a rechargeable lithium battery, a preparation method of the same, and a rechargeable lithium battery including the same are provided. The positive electrode active material includes a first particle containing a compound represented by Formula 1 and having a first average particle diameter, and a second particle containing a compound represented by Formula 2 and having a second average particle diameter smaller than the first average particle diameter. An amount by weight of the second particle is greater than an amount by weight of the first particle.