LITHIUM SECONDARY BATTERY AND METHOD OF OPERATING LITHIUM SECONDARY BATTERY

A lithium secondary battery, and a method of operating a lithium secondary battery are provided. The lithium secondary battery includes a cathode including a cathode active material layer that includes a lithium-nickel metal oxide, and an anode opposing the cathode. A full width at half maximum ratio or a relative peak area ratio of the lithium secondary battery is 70% or more.