METHOD FOR PREPARING CATHODE MATERIAL FOR LITHIUM SECONDARY BATTERY, CATHODE MATERIAL FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY CONTAINING SAME

摘要

Provided are a method of preparing a positive electrode material for a lithium secondary battery, a positive electrode material for a lithium secondary battery, and a lithium secondary battery including the positive electrode material. Specifically, 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,
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ[Chemical Formula 1]€ƒ€ƒ€ƒ€ƒ€ƒLi (1+a) (Ni (1-a-b-c) Mn b Co c )
where 0‰¤a‰¤0.1, 0‰¤b‰¤1, 0