Samsung Sdi Co., Inc.

Youngugk Kim

Yeongap Kim

Jiyeon Kwak

Jaehou Nah

Yookyung Kim

Sunil Park

Hee Seon Choi

Eunji Kang

Doori Oh

Heeseon Choi

Young-Min Kim

Jaewon Kim

Deok-Hyun Kim

Jungho Lee

Yongchan You

Changsu Shin

Pil Jin Yoo

Jaemyung Kim

Inoh Cha

Heeyoung Chu

Chul Youm

Changui Jeong

Jongmin Won

Narae Kim

Ilyoung Choi

Dae-Hyeok Lee

Sangeun Park

Uisong Do

Yuntaek Oh

Sangpil Kim

Hyejin Kim

Banseok Lee

A negative active material includes a core having a silicon-carbon composite and a polymer coating layer formed on the core, wherein the negative active material has about 1.02 to about 1.6 of a ratio of height of N1s peak occurring at about 400±about 0.5 eV relative to a height of N1s peak occurring at about 405±about 0.5 eV of a bonding energy, and about 1.02 to about 3.0 of a ratio of a height of C1s peak occurring at about 286.5±about 0.5 eV relative to a height of C1s peak occurring at about 290±about 0.5 eV when an X-ray photoelectron spectroscopy (XPS) is measured.

Negative active material and rechargeable lithium battery including same

A negative active material, including a first active material including a silicon core and a carbon coating layer on the core, a carbon second active material having an aspect ratio of about 4 to about 100, and a crystalline carbon third active material.

A negative active material, including a silicon-carbon composite including silicon and amorphous carbon, a metal oxide, and a metal silicate.

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

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Yongin-si, South Korea

Youngugk Kim