Samsung Sdi Co., Inc.

Uisong Do

Sangeun Park

SungSu A Kim

Yongchan You

Changsu Shin

Youngugk Kim

Inoh Cha

Yeongap Kim

Hee Seon Choi

Changui Jeong

Jiyeon Kwak

Yuntaek Oh

Hyunki Park

A negative active material, a lithium battery including the negative active material, and a method of preparing the negative active material. The negative active material includes: a core particle including a silicon based alloy; carbon nanoparticles disposed on a surface of the core particle; and an amorphous carbonaceous coating layer disposed on at least a portion of a surface of the core particle. The negative active material may improve the lifetime characteristics of the lithium batteries.

Negative active material, lithium battery including the negative active material, and method of preparing the negative active material

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

Uisong Do