Samsung Sdi Co., Inc.

Changui Jeong

Hyeri Eom

Changsu Shin

Sora Lee

Yongchan You

Yury Matulevich

Jaehyuk Kim

Soonsung Suh

Seunguk Kwon

Youngugk Kim

Heeyoung Chu

Inoh Cha

Yeongap Kim

Hee Seon Choi

Jiyeon Kwak

Sangeun Park

Uisong Do

Yuntaek Oh

Chungyoo Lee

Sungwan Moon

Seunguh Kwon

Yohan Park

Jongseo Choi

Sunghwan Moon

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

A composite electrode active material includes: a core portion including a silicon-based alloy; and a shell portion disposed on the core portion and including a coating layer, wherein the coating layer includes an amorphous carbon material and a lithium titanium oxide. A lithium battery including the composite electrode active material and a method of manufacturing the composite electrode active material are also provided.

Composite electrode active material, lithium battery including the same, and preparation method thereof

Disclosed is a secondary battery including a negative electrode, a positive electrode, and an electrolyte between the negative electrode and the positive electrode, wherein the negative electrode includes a negative electrode active material including: an Si&#x2014;Fe based alloy core; a carbonaceous first coating layer disposed on the core; and a second coating layer which is disposed on the first coating layer and includes carbon nanotubes (CNTs) having an average length of about 1.0 nm to about 2.0 &#x3bc;m.

Secondary battery

A negative electrode active material and a secondary battery including the same are provided. More particularly, the present disclosure relates to a negative electrode active material including a Si-metal alloy including Si, the Si being present in the Si-metal alloy in an amount of 66 at % or less, and at least a portion of the Si being crystalline Si. The negative active material can provide a high-capacity battery, which can retain high capacity due to little volumetric expansion during charging and discharging, thereby demonstrating an excellent life characteristic of the secondary battery. The negative electrode active material may include a Si-metal alloy including crystalline Si having a crystal grain size of 30 nm or less. Methods of preparing a negative electrode active material and methods of preparing a secondary battery including the same are also disclosed.

Negative electrode active material and secondary battery including the same

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Yongin-si, South Korea

Changui Jeong