Abstract: A cobalt oxide for a lithium secondary battery, a method of preparing the cobalt oxide; a lithium cobalt oxide for a lithium secondary battery formed from the cobalt oxide; and a lithium secondary battery having a positive electrode including the lithium cobalt oxide, the cobalt oxide having a tap density of about 2.8 g/cc to about 3.0 g/cc, and an intensity ratio of about 0.8 to about 1.2 of a second peak at 2? of about 31.3±1° to a first peak at 2? of about 19±1° in X-ray diffraction spectra, as analyzed by X-ray diffraction.

Abstract: A cobalt oxide for a lithium secondary battery, a method of preparing the cobalt oxide; a lithium cobalt oxide for a lithium secondary battery formed from the cobalt oxide; and a lithium secondary battery having a positive electrode including the lithium cobalt oxide, the cobalt oxide having a tap density of about 2.8 g/cc to about 3.0 g/cc, and an intensity ratio of about 0.8 to about 1.2 of a second peak at 2? of about 31.3±1° to a first peak at 2? of about 19±1° in X-ray diffraction spectra, as analyzed by X-ray diffraction.

Abstract: A cobalt oxide for a lithium secondary battery, a method of preparing the cobalt oxide; a lithium cobalt oxide for a lithium secondary battery formed from the cobalt oxide; and a lithium secondary battery having a positive electrode including the lithium cobalt oxide, the cobalt oxide having a tap density of about 2.8 g/cc to about 3.0 g/cc, and an intensity ratio of about 0.8 to about 1.2 of a second peak at 2? of about 31.3±1° to a first peak at 2? of about 19±1° in X-ray diffraction spectra, as analyzed by X-ray diffraction.

Abstract: The present disclosure relates to a cathode active material for a lithium secondary battery, a method for preparing same, and a lithium secondary battery comprising same, the cathode active material comprising a lithium-nickel compound oxide, wherein a c-axis lattice parameter of a unit lattice of the lithium-nickel compound oxide satisfies Formula 1: 14.1720 ?A?c?14.

Abstract: The present disclosure relates to a cathode active material for a lithium secondary battery, a method for preparing same, and a lithium secondary battery comprising same, the cathode active material comprising a lithium-nickel compound oxide, wherein a c-axis lattice parameter of a unit lattice of the lithium-nickel compound oxide satisfies Formula 1: 14.1720 ?A?c?14.

Abstract: A positive active material for a rechargeable lithium battery includes a core including a compound represented by Chemical Formula 1 and a functional layer on a surface of the core. The functional layer has one kind of a crystal structure that is different from the crystal structure of the core. The positive active material includes about 100 ppm to about 400 ppm of sulfur: LiaNixCoyMezO2,??Chemical Formula 1 wherein in Chemical Formula 1, 0.9?a?1.1, 0.5?x?0.93, 0<y?0.3, 0<z?0.3, x+y+z=1, and Me is Mn or Al.

Abstract: A cobalt oxide for a lithium secondary battery, a method of preparing the cobalt oxide; a lithium cobalt oxide for a lithium secondary battery formed from the cobalt oxide; and a lithium secondary battery having a positive electrode including the lithium cobalt oxide, the cobalt oxide having a tap density of about 2.8 g/cc to about 3.0 g/cc, and an intensity ratio of about 0.8 to about 1.2 of a second peak at 2? of about 31.3±1° to a first peak at 2? of about 19±1° in X-ray diffraction spectra, as analyzed by X-ray diffraction.

Abstract: A positive active material, a positive electrode, and a lithium secondary battery, the positive active material including a lithium cobalt oxide compound, wherein the lithium cobalt oxide compound includes magnesium in a range of about 0.1 mol % to about 2 mol %, based on a total number of moles of transition metals in the lithium cobalt oxide compound, and a thickness of a lithium layer in the lithium cobalt oxide compound is in a range of about 2.62 ? to about 2.65 ?.

Abstract: Provided are a positive active material, a positive electrode including the same, and a lithium secondary battery including the positive electrode. The positive active material includes lithium cobalt oxide containing a metal element, and the lithium cobalt oxide containing a metal element has a ratio of a peak intensity of the O3 phase to a peak intensity of the H1-3 phase, IO3/IH1-3, that is greater than 1 in a X-ray diffraction (XRD) analysis spectrum using Cu-K? radiation. Accordingly, a lithium secondary battery including the positive active material may have improved lifespan characteristics even at a high voltage.

Abstract: Provided are a positive active material, a positive electrode including the same, and a lithium secondary battery including the positive electrode. The positive active material includes lithium cobalt oxide containing a metal element, and the lithium cobalt oxide containing a metal element has a ratio of a peak intensity of the O3 phase to a peak intensity of the H1-3 phase, IO3/IH1-3, that is greater than 1 in a X-ray diffraction (XRD) analysis spectrum using Cu-K? radiation. Accordingly, a lithium secondary battery including the positive active material may have improved lifespan characteristics even at a high voltage.