Samsung Sdi Co., Inc.

Daehoe Lee

Dohyung Park

Junseok Park

Jihyun Kim

Jinhwa Kim

Seonyoung Kwon

Dongjin Kim

Minhan Kim

ILseok Kim

Changwook Kim

Sooyoun Park

Gyuran Jeon

Jeonjin Choi

Okgyu Lim

Sangwoo Cho

Ilseok Kim

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&#x3b8; of about 31.3&#xb1;1&#xb0; to a first peak at 2&#x3b8; of about 19&#xb1;1&#xb0; in X-ray diffraction spectra, as analyzed by X-ray diffraction.

Lithium cobalt oxide for a lithium secondary battery and lithium secondary battery comprising positive electrode including the same

Cobalt oxide for lithium secondary battery, preparing method thereof, lithium cobalt oxide formed from the cobalt oxide, and lithium secondary battery having positive electrode including the lithium cobalt oxide

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 &#x212b;A&#x2264;c&#x2264;14.1750 &#x212b;A&#x2003;&#x2003;[Formula 1]

Cathode active material for lithium secondary battery, method for producing same, and lithium secondary battery comprising same

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, I/I, that is greater than 1 in a X-ray diffraction (XRD) analysis spectrum using Cu-K&#x3b1; radiation. Accordingly, a lithium secondary battery including the positive active material may have improved lifespan characteristics even at a high voltage.

Positive active material, positive electrode including the same, and lithium secondary battery including the positive electrode

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Yongin-si, South Korea

Daehoe Lee