Method of preparing positive electrode material for lithium secondary battery, positive electrode material for lithium secondary battery, and lithium secondary battery including the positive electrode material

摘要

The present invention relates to a method of preparing a positive electrode material for a lithium secondary battery including a first step of synthesizing a lithium transition metal oxide represented by Chemical Formula 1, a second step of preparing lithium transition metal oxide powder by grinding the lithium transition metal oxide, a third step of preparing a positive electrode material including an alumina coating layer by mixing as well as dispersing the lithium transition metal oxide powder in an alumina nanosol, and a fourth step of drying the positive electrode material, a positive electrode material for a lithium secondary battery prepared by the above method, and a lithium secondary battery including the positive electrode material,Li_(1+a)(Ni_{(1−a−b−c)}Mn_bCo_c)O_n  [Chemical Formula 1]where 0≤a≤0.1, 0≤b≤1, 0