Samsung Sdi Co., Inc.

Yuntaek Oh

Jinhwa Kim

Donggyu Chang

Yongchan You

Minhan Kim

Youngugk Kim

Inoh Cha

Hee Seon Choi

Yeongap Kim

Changui Jeong

Jiyeon Kwak

Jihyun Seog

Sangeun Park

Uisong Do

Jungwoo Son

The application relates to a positive active material precursor including a transition metal composite oxide precursor. The transition metal composite oxide precursor exhibits a peak full width at half maximum of a (200) plane (2θ=about 42° to about 44°) in X-ray diffraction analysis in a range of about 0.3° to about 0.5°. The application also relates to a positive active material using the precursor, a method of preparing the same, and a positive electrode and a rechargeable lithium battery including the same.

Positive active material precursor, positive active material, method of preparing the same, positive electrode including the same and rechargeable lithium battery including the same

The present invention relates to a negative active material for a lithium secondary battery, a preparation method therefor, and a lithium secondary battery including the same. The negative electrode active material is a negative electrode material for a secondary battery, the negative electrode active material comprising a silicon-carbon composite comprising: a core comprising crystalline carbon and silicon particles; and an amorphous carbon-containing coating layer disposed on a surface of the core, wherein the negative electrode active material comprises: silicon oxide formed on a surface of the silicon particles; and an oxide of crystalline carbon, formed on a surface of the crystalline carbon, the average particle diameter (D50) of the silicon particles having a nanometer size, the proportion of O relative to Si in the silicon oxide is 30%-50%, and the proportion of O relative to C in the oxide of the crystalline carbon is 4%-10%.

Negative electrode active material for lithium secondary battery, preparation method therefor, and lithium secondary battery comprising same

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Yongin-si, South Korea

Yuntaek Oh