POSITIVE ELECTRODE ACTIVE MATERIAL WITH IMPROVED ENERGY DENSITY

摘要

The present invention relates to a mixed positive electrode active material and, more specifically, to a mixed positive electrode active material so as to display high energy density. According to the present invention, a mixed positive electrode active material mixes a positive electrode active material comprising a concentration gradient unit with high energy density and a lithium-nickel-cobalt-manganese composite oxide having a layer structure with relatively high stability as controlling the particle size, thereby displaying high energy density and high stability.