MIXED CATHODE MATERIAL AND PREPARATION METHOD THEREFOR

The present invention relates to a blended positive electrode material comprising a first positive electrode active material containing a first lithium transition metal oxide and a second positive electrode active material containing a second lithium transition metal oxide, wherein each of the first lithium transition metal oxide and the second lithium transition metal oxide has a nickel content of 70 mol% or greater with respect to of all metals excluding lithium, the first positive electrode active material has a D50 greater than the second positive electrode active material, and EELS analysis results of particle surfaces of both the first positive electrode active material and the second positive electrode active material satisfy Equation 1, and a method for preparing the same.