POSITIVE ELECTRODE MATERIAL, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING SAME

A positive electrode material includes a positive electrode active material that includes: lithium nickel-based oxide particles in the form of secondary particles as agglomerates of primary particles, in which among all metals excluding lithium, the content of Ni is 50 mol% to 90 mol%; and a boron (B)-containing coating layer formed on the surface of the lithium nickel-based oxide particles. The BET specific surface area of the positive electrode material is 0.41 m/g to 0.59 m/g, and the average crystallite size of the positive electrode material is 155 nm or more