Cathode material improved conductivity cathode and electrochemical device including the same

摘要

The present invention relates to a positive electrode mixture having improved conductivity, a positive electrode and an electrochemical device having the same, and more particularly, to a positive electrode material mixture containing a lithium manganese oxide having a spinel structure, wherein the lithium manganese- A crystal structure is transformed from a cubic structure to a tetragonal structure in a direction from the surface to the center of the particle to form a core-shell structure, and a tetragonal structure A polymer binder, and a conductive polymer, and a positive electrode and an electrochemical device including the same. According to one embodiment of the present invention, in the lithium manganese-based oxide of the spinel structure, the conductive polymer is placed on the surface of the shell portion existing in the tetragonal structure to improve the electric conductivity, It is possible to improve the capacity, lifetime characteristics and rate characteristics of the electrochemical device by providing a conductive path.