Korea Institute of Science and Technology

Joo Man Woo

Joong Kee Lee

Hyung Sun Kim

Byung Won Cho

Min Woo Lee

Hyun Jung Lee

Kyung Yoon Chung

Won Il Cho

Won Young Chang

Sang Hyup Lee

Sang Ok Kim

Un Sek Kim

Han Byul Kim

Sang Eun Park

Dalkeun Park

The present invention relates to a method of preparing a porous silicon nanorod structure composed of columnar bundles having a diameter of 50-100 nm and a length of 2-5 &#x3bc;m, and a lithium secondary cell using the porous silicon nanorod structure as an anode active material. The present invention provides a high-capacity and high-efficiency anode active material for lithium secondary cells, which can overcome the low conductivity of silicon and improve the electrode deterioration attributable to volume expansion because it is prepared by electrodepositing the surface of silicon powder with metal and simultaneously etching the silicon powder partially using hydrofluoric acid.

Method of preparing bundle type silicon nanorod composite through electroless etching process using metal ions and anode active material for lithium secondary cells comprising the same

An apparatus and a method for recovery of sulfur hexafluoride is provided. Sulfur hexafluoride (SF) may be separated with high-concentration and improved recovery ratio through a multi-stage separation and recovery processes using a plurality of separation membrane modules, and as well, SFgas may be concentrated to maximize the SFrecovery ratio before the separation and recovery processes through the separation membrane modules. Furthermore, sulfur dioxide (SO) and moisture included in the SFwaste gas may be removed effectively so as to extend the service life of the separation membrane modules.

Apparatus and method for recovery of sulfur hexafluoride

A carbon anode active material for lithium secondary battery comprising a cluster or thin film layer of a metal or metal oxide coated onto the surface of the carbon active material, a preparation method thereof, and a metal-carbon hybrid electrode and a lithium secondary battery comprising the same. The carbon active material is prepared through a gas suspension spray coating method. An electrode comprising the carbon active material according to the present invention shows excellent conductivity, high rate charge/discharge characteristics, cycle life characteristics and electrode capacity close to theoretical value.

Carbonaceous materials coated with a metal or metal oxide, a preparation method thereof, and a composite electrode and lithium secondary battery comprising the same

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Seoul, South Korea

Joo Man Woo