POSITIVE ELECTRODE ACTIVE MATERIAL FOR A SECONDARY BATTERY HAVING IMPROVED RATE CHARACTERISTICS

摘要

The present invention relates to a novel positive electrode active material for a secondary battery, and more particularly, to a positive electrode active material in which excessive lithium is mixed in a positive ion layer of a transition metal to reduce the amount of oxygen loss from a crystal structure at a high voltage of about 4.3 V to about 4.6 V.