Positive electrode active material for lithium secondary battery and manufacturing method therefor

摘要: The present invention relates to a positive electrode active material which has a new composition, a non-rocksalt-type structure, and a new local structure, has significantly increased electrochemical activity, and thus can achieve high-capacity energy and significantly improved electro chemical performance, and a method of preparing the same. The positive electrode active material according to the present invention has a composition of [Formula 1] below, and the layered non-rocksalt-type structure, wherein excess lithium is present to be inappropriate for a site balance, and the excess lithium enters an octahedral site and a tetrahedral site