Lg Chem, Ltd

Sejong University

Eun Kyung Cho

Doo Kyung Yang

Jong Hyun Chae

Yu Mi Kim

Dong Wook Lee

Gi Su Park

Jae Sung Han

Nae Sung Lee

Chang Jin Lim

Byung Gook Lyu

Jeung Choon Goak

The present invention relates to a positive electrode of a lithium-air battery having a side reaction prevention layer with a partially introduced metal catalyst, and a method for preparing the same, and in particular, to a positive electrode of a lithium-air battery having a side reaction prevention layer with a metal catalyst sporadically partially introduced to a surface thereof, and a method for preparing the same. The lithium-air battery according to the present invention suppresses a side reaction at an interface between a positive electrode active material and an electrolyte thereby effectively reduces an overvoltage when charged, and therefore, does not cause liquid electrolyte decomposition, which is effective in enhancing a cycle life.

Positive electrode of lithium-air battery having side reaction prevention film to which metal catalyst is partially introduced, lithium-air battery having same, and manufacturing method therefor

A method for purifying carbon nanotubes (CNTs) includes heating the CNTs including metallic impurities and metallic oxide impurities; reducing the metallic oxide impurities by passing a reducing gas through the CNTs; removing the metallic impurities and the reduced metallic oxide impurities by passing a liquid halide through the CNTs using a carrier gas; and cooling the CNTs. Therefore, by simply passing liquid chloroform through CNTs using a carrier gas, a method for purifying CNTs can be provided so as to simply, economically, and effectively remove metallic impurities from the CNTs in a short time through one step. In addition, the purification effect can be further improved by removing the metallic oxide impurities as well as the metallic impurities through the reducing step. In addition, it is possible to improve the purification effect by further performing a step of removing a halogen or an acid-treatment purification step.

Method for purifying carbon nanotubes

Growing community of inventors

Daejeon, South Korea

Eun Kyung Cho