Positive active material for rechargeable lithium batteries and method for preparing same

摘要

Provided are a positive active material and a method of preparing for the same. The positive active material comprises a core and a surface-treatment layer on the core. The core includes at least one lithiated compound, and the surface-treatment layer includes at least one coating element-included oxide. The lithiated compound includes a secondary particle of which average particle size is larger than or equal to 1 mum and less than 10 mum. The secondary particle is formed of an agglomeration of small primary particles of an average size of 1 to 3 mum in diameter. The positive active material is prepared by coating the lithiated compound with an organic solution or an aqueous solution including a coating-element source and heat-treating the coated compound.