Samsung Sdi Co., Inc.

Yeongap Kim

Youngugk Kim

Jiyeon Kwak

Hee Seon Choi

Heeseon Choi

Yongchan You

Inoh Cha

Deokhyun Kim

Changui Jeong

Xianhui Meng

Sangeun Park

Uisong Do

Youngjin Choi

Yuntaek Oh

Sanghyuck Ahn

Sangpil Kim

Sukyung Lee

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

Provided are an anode active material for a lithium secondary battery and a lithium secondary battery comprising the same, wherein the anode active material comprises at least three types of spherical graphite, and a difference between a 90% volume cumulative diameter (D) and a 10% volume cumulative diameter (D) is in the range of 13.0 &#x3bc;m&#x2264;(D&#x2212;D)&#x2264;35.0 &#x3bc;m.

Anode active material for lithium secondary battery and lithium secondary battery comprising same

A composite anode active material includes: a core portion including a crystalline carbonaceous material; a shell portion including a plurality of composite particles deposited on at least a portion of the core portion, wherein each of the composite particles includes a metallic core that is alloyable with lithium; and a coating layer including metal nitride on the surface of the metallic core in an island pattern. A lithium battery including the composite anode active material and a method of preparing the composite anode active material are also provided.

Composite anode active material, lithium battery including the same, and method of preparing the composite anode active material

Negative active materials, lithium batteries including the negative active materials, and methods of preparing the negative active materials. The negative active material includes a complex including: a silicon-based core; particles of metal nitride randomly disposed on the silicon-based core, and nanostructures disposed on at least one of the silicon-based core or the metal nitride. The negative active material may improve the electrical conductivity of a negative electrode. Accordingly, a lithium battery including the negative electrode may have improved lifetime characteristics.

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

Provided is a composite anode active material with pores having a composition represented by Formula 1, and, the composite anode active material contains an amorphous phase including Si and a nano-crystalline phase including a metal silicide:SiMC&#x2003;&#x2003;&#x3c;Formula 1&#x3e;

Composite anode active material, anode and lithium battery containing the material, and method of preparing the composite anode active material

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Yongin-si, South Korea

Yeongap Kim