Patent ID: 10727532

Abstract:
The positive active material for a lithium secondary battery includes a lithium transition metal composite oxide having an α-NaFeO2 structure, and having a diffraction peak at 2θ=44±1° and a diffraction peak at 2θ=18.6±1° in a powder X-ray diffraction diagram using a CuKα ray. In a ratio FWHM (003)/FWHM (104) of a full width at half maximum FWHM (003) for the diffraction peak at 2θ=18.6±1° to a full width at half maximum FWHM (104) for the diffraction peak at 2θ=44±1°, a ratio of FWHM (003)/FWHM (104) in a charge state immediately after a discharge state to FWHM (003)/FWHM (104) in the discharge state is 0.72 or more.