POSITIVE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD OF PREPARING SAME, AND LITHIUM SECONDARY BATTERY INCLUDING POSITIVE ELECTRODE INCLUDING THE POSITIVE ACTIVE MATERIAL

Provided are a positive active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery including a positive electrode for a lithium secondary battery including the positive active material, where the positive active material includes a lithium cobalt-based oxide including about 6,000 ppm or more of aluminum, and a lithium titanium-based compound, where the lithium titanium-based compound is on a surface of the lithium cobalt-based oxide.