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

A positive active material for a rechargeable lithium battery includes a lithium nickel-based composite oxide including a secondary particle in which a plurality of plate-shaped primary particles are agglomerated; and a coating layer including a fiber-shaped lithium manganese composite oxide, wherein the fiber-shaped lithium manganese composite oxide is attached to the surface of the lithium nickel-based composite oxide.