Korea Advanced Institute of Science and Technology

Sk Innovation Co., Ltd.

Seung Hwan Jo

Soo Hyun Kim

Jin Hwan Kim

Sang Wook Lee

Jeong Soo Kim

Young Shol Kim

Ku Bong Chung

Won Sik Kwon

Hyub Lee

Jin Doo Choi

Seung Ryeol Oh

Sung Yoon Ryu

Kyung-Soo Kim

Kyung-Suo Kim

Provided is a sodium secondary battery including: a sodium ion conductive solid electrolyte separating an anode space and a cathode space from each other; an anode positioned in the anode space and containing sodium; a cathode solution positioned in the cathode space; and a cathode immersed in the cathode solution and including graphite felt formed with open pore channel of which an opening part is formed on a surface of the graphite felt facing the solid electrolyte.

Sodium secondary battery including graphite felt having pore channels formed therein

Provided are a solid electrolyte for a sodium secondary battery, and a surface treatment method thereof, and more specifically, a solid electrolyte for a sodium secondary battery capable of having excellent electrochemical performance by improving wettability with respect to molten sodium, even under a low temperature operation environment of 250&#xb0; C. or less, and a surface treatment method thereof.

Surface treatment method of solid electrolyte for sodium secondary battery

Provided is a device of generating various types of pulses by controlling a distance between saturable absorber connectors, and more particularly, a device of generating various types of pulses by controlling a distance between saturable absorber connectors, capable of actively controlling a distance between saturable absorbers to completely overcome a disadvantage that an opened space is present in a cavity or a disadvantage that a fiber component should be changed and implementing a simple design of the entire fiber laser cavity since only a saturable absorber part, which is a portion of a fiber laser cavity, should be designed, as a carbon nanotube saturable absorber part in a passively mode-locked fiber laser generating apparatus using the saturable absorber.

Device which produces various types of pulses by controlling the distance between the saturable absorber connectors

Provided is single-walled carbon nanotube saturable absorber production via a multi-vacuum filtration method, and more particularly, single-walled carbon nanotube saturable absorber production via a multi-vacuum filtration method, capable of depositing a carbon nanotube thin film on a filter using a vacuum chamber and a membrane filter, etching the filter using an etchant so as to be transferred to an upper surface of the polymer, coating the polymer on the carbon nanotube to thereby produce a carbon nanotube saturable absorber, as a method of producing a carbon nanotube thin film to transfer the thin film to the polymer using a multi-filtration method in order to produce a passive saturable absorber to be used in laser oscillation.

Single walled carbon nanotube saturable absorber production via multi-vacuum filtration method

Growing community of inventors

Daejeon, South Korea

Seung Hwan Jo