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

Positive electrode active materials, their manufacturing methods, and rechargeable lithium batteries are disclosed. A positive electrode active material includes a first particle that includes a compound represented by Chemical Formula 1 and has a first average particle diameter. A ratio (I/I) of intensity (I) of D peak at a wave number of about 1340±10 cmin the Raman spectrum obtained from Raman spectroscopy to intensity (I) of G peak at a wave number of about 1590±10 cmin the Raman spectrum obtained from Raman spectroscopy is in a range of about 0.9 to about 1.3.