Sk Innovation Co., Ltd.

Other

Electronics and Telecommunications Research Institute

Ulsan National Institute of Science and Technology

Lucky Limited

Phovelco.ltd.

Ceramatec, Inc.

Korea Telecom

Korea United Pharm, Inc.

Field Upgrading Usa, Inc.

Phovel. Co. Ltd

Jeong Soo Kim

Young Shol Kim

Je Hyun Chae

Seung Ok Lee

Won Sang Koh

Dai In Park

Ku Bong Chung

Jin H Cho

Hong Woo Kim

Seung Hwan Jo

Jae S Rim

Su M Hong

Chang U Hur

Sang H Chae

Ashok V Joshi

Sai Bhavaraju

Sang Ho Park

Yongsoon Baek

Young-Tak Han

Jang Uk Shin

Chan Yong Park

Young Hee Lim

Nam Soon Choi

Mathew Robins

Seung Won Lee

Hun S Oh

Hee Young Sun

Hyung Keun Lee

Alexis Eccleston

Kwang Ho Cha

Woo B Choi

Min Soo Kim

Dug Bong Kim

Sung Joo Hwang

Jun Yeong Jang

Kyu Tae Lee

Seung Hee Woo

Kwang Ho Ha

Byoung B Lee

Yeong T Bae

Sang K Yoo

Ho S Lee

Won Kyung Cho

Suk Jun Seo

June Soo Lee

Jun Sung Park

Provided is a Na based secondary battery including: an anode containing sodium or a sodium alloy; a cathode containing a metal halide, which is a halide of at least one metal selected from a group consisting of alkali metals, transition metals, and Groups 12 to 14 metals, and a solvent dissolving the metal halide; and a sodium ion conductive solid electrolyte separating the cathode and the anode from each other.

Na based secondary battery

Provided are an electrolyte for a sodium secondary battery, and a sodium secondary battery using the same, and the sodium secondary battery using the electrolyte for a sodium secondary battery according to the present invention may have an excellent cycle characteristic, charge-discharge capacity, and stability, thereby making it possible to be operated without deterioration at a low temperature for a long time.

Electrolyte for sodium secondary battery and sodium secondary battery using the same

Provided are an electrolyte for a sodium secondary battery and a sodium secondary battery using the same. More particularly, the sodium secondary battery includes an anode containing sodium, a cathode containing a transition metal, and a sodium ion conductive solid electrolyte provided between the anode and the cathode, wherein the cathode is impregnated in an electrolyte containing a molten sodium salt and an electrolyte additive, the electrolyte additive including an inorganic sodium salt.

Electrolyte for sodium secondary battery and sodium secondary battery using thereof

Provided is a cathode active material for a secondary battery, specifically, a cathode active material for a secondary battery including sodium transition metal pyrophosphate satisfying NaAMM(PO), which has an advantage of structural stability due to a strong P&#x2014;O bond of sodium transition metal phosphate having an olivine structure, and also performs proper intercalation and deintercalation of Na ions having a large ion radius, thereby significantly improving reversibility during charging and discharging, and a charge and discharge rate.

Positive electrode active material for secondary battery

Provided is a current collector including a laminate in which a conductive substrate and an insulator are laminated, wherein the insulator is a porous insulator formed with an open pore channel penetrating through the insulator. The current collector may be used as a current collector for an electrode of a secondary battery and stably maintain capacity of the secondary battery at the time of repeating charge and discharge cycles.

Current collector for battery and secondary battery comprising the same

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

The present invention relates to a wavelength-tunable laser, which can tune an oscillating laser wavelength and can be manufactured in a small size, comprising: a laser diode chip () for emitting a laser beam; a partial reflection mirror () for optical feedback, which partially reflects the beam emitted from the laser diode chip () so as to enable the reflected beam to be fed back to the laser diode chip (); a collimation lens () provided on an optical path between the laser diode chip () and the partial reflection mirror () for optical feedback so as to collimate the beam emitted from the laser diode chip (); a wavelength-tunable selective filter () for converting the wavelength transmitted according to the temperature; a phase compensator () of which a refractive index is changed according to the temperature and which offsets a change in the refractive index according to the temperature of the semiconductor laser diode chip () or the wavelength-tunable selective filter (); and a 45 degree reflection mirror () for switching the direction of the laser beam from the laser beam traveling in the horizontal direction with respect to a bottom surface of a package, to the laser beam traveling in the vertical direction with respect to the bottom surface of the package, wherein the laser diode chip (), the wavelength-tunable selective filter (), and the phase compensator () are disposed at an upper part of a thermoelectric element () so as to change the wavelength oscillating according to a change in the temperature of the thermoelectric element ().

Wavelength-tunable laser

Provided is a sodium secondary battery including a graphite felt having a maximum porosity on a surface facing a solid electrolyte and a decreased porosity in a thickness direction, as a cathode current collector impregnated with an electrolyte.

Sodium secondary battery including graphite felt as current collector

Provided is a sodium secondary battery capable of operating at a low temperature. More particularly, the sodium secondary battery according to the present invention includes: an anode containing sodium; a cathode containing a transition metal and an alkali metal halide; and a sodium ion conductive solid electrolyte provided between the anode and the cathode, wherein the cathode is impregnated in a molten salt electrolyte containing a sodium.metal halogen salt including at least two kinds of halogens.

Sodium secondary battery

There is provided a method for measuring a temperature using a thermistor with which it is possible to precisely measure a temperature above a thermoelectric device by using a thermistor disposed on the thermoelectric device in a module for controlling a temperature of a component arranged on the thermoelectric device by using the thermoelectric device. In the method for measuring a temperature using a thermistor, by electrically connecting the thermistor to an electrode pin through a thermoelectric device or a bridge sub-mount mounted on the thermoelectric device when electrically connecting a top surface of the thermistor and the electrode pin, it is possible to suppress direct heat exchange between the thermistor and the electrode pin. Further, it is possible to effectively suppress heat exchange between the thermistor and a package lid by internal gas of a package by covering the thermistor with a polymer material, such as an epoxy having low thermal transmittance. As a result, it is possible to allow the thermistor to precisely measure the temperature of the thermoelectric device.

Method for measuring temperature using a thermistor

The present invention relates to a wavelength-tunable laser apparatus which can measure a wavelength in a wavelength-tunable laser diode package structure for dense wavelength division multiplexing (DWDM) having a transistor outline (TO) type appearance. The wavelength-tunable laser apparatus of the present invention is a TO-can type wavelength-tunable laser apparatus comprising: a laser diode chip for emitting a laser beam; a collimator lens for collimating the laser beam; a wavelength-selective filter through which the selected wavelength passes; and a reflecting mirror having an inclined reflective surface, wherein the laser beam is split into a beam which is emitted from the laser diode chip (), collimated by the collimator lens () and emitted through a 45-degree reflective mirror () to the outside of a TO-can type package, and a beam which passes through the 45-degree reflective mirror (), the beam passing through the 45-degree reflective mirror () is split into at least two branched beams, a first photodiode () is arranged on the path of one branched beam so as to monitor the beam, and wavelength-selective filters () having variable transmittance according to the wavelengths and a second photodiode () are further arranged on the path of the other branched beam.

Wavelength-tunable laser apparatus having wavelength measuring function

Provided is a transistor outline (TO)-CAN type optical module and an optical transmission apparatus including the same. The optical module includes a stem, a thermo-electric cooler (TEC) on the stem, a first sub-mount on the TEC, an optical element on the first sub-mount, a plurality of electrode lead wirings inserted from an outside to an inside of the stem and disposed adjacent to the TEC and the optical element, a second sub-mount between the electrode lead wirings and the optical element, radio frequency (RF) transmission lines on the second sub-mount, a plurality of bonding wires connecting the RF transmission lines and the optical element, and the RF transmission lines and the electrode lead wirings, and an impedance matching unit disposed around the RF transmission lines and the electrode lead wirings, and controlling impedances of the RF transmission lines and the electrode lead wires.

Radio frequency optical module and optical transmission apparatus including the same

The present invention relates to a novel technology for forming fine particles with a size of 0.0&#x2dc;23 microns from a solid that can be dissolved in a liquid solvent and is not decomposed by heat. The particle preparation technology according to the present invention may be applicable to the fields of food, cosmetics, biopolymer, polymer compositions, and pharmaceuticals.

Manufacturing method and apparatus of ultrafine particles having uniform particle size distribution

A semiconductor laser using an external resonator. A laser diode chip emits a laser beam in a horizontal direction parallel to the bottom plane of a package, and the travel path of the laser beam is changed into a vertical direction by a reflective mirror next to a laser beam-emitting surface of the laser diode chip. As a result, the beam arrangement of the external cavity is available on a plane parallel to the bottom plane of the package through a lens installed on the vertical travel path of the laser beam. Consequently, the beam is easily arranged. Furthermore, an additional reflective mirror is installed above the lens which changes the vertical travel path into a horizontal travel path, which allows the beam traveling parallel to the bottom plane to be easily arranged through the lens. The production of the package can also be enabled in the configuration where various optical tools are arranged on the bottom of the package. Therefore, the semiconductor laser using an external cavity and having various characteristics can be easily manufactured.

Semiconductor laser using external resonator

Growing community of inventors

Daejeon, South Korea

Jeong Soo Kim