Korea Institute of Science and Technology

Korea Electronics Technology Institute

Posco M-tech

Byung Won Cho

Kyung Yoon Chung

Hyung Sun Kim

Won Young Chang

Joong Kee Lee

Won Il Cho

Si Hyoung Oh

Hwa Young Lee

Kyung Suk Yun

Dong Hyun Kim

Hun-Gi Jung

Jaehoon Kim

Ji-young Kim

Jae Hyun Cho

Jaeho Park

Eun Jung Shin

Joo Man Woo

Un Sek Kim

Chi Hum Paik

Won Chang Choi

Sang Hoon Lee

Jong Min Park

Su Jin Kim

Yong Ho Lee

Hyung Jin Jung

Seong M Jo

Dong Jin Suh

Kun You Park

Young-Jun Kim

Il Doo Kim

Sang Whan Park

Soo Hyung Kim

Hyungseok Kim

Wha Seop Lee

Min Kyung Cho

Sang Ok Kim

Ki Jae Kim

Minah Lee

Ji-Hoon Lee

Seong-Rae Lee

Ji-Ae Choi

Young Soo Yoon

Suk Won Chun

Seungho Yu

Jiwon Jeong

Chang-Sam Kim

Nugroho Agung

Ghulam Ali

Chan Wook Jeon

Seok Ku Ko

Sung Won Choi

Liau Dieky Susanto

Dalkeun Park

Juhyeon Ahn

Young Hwa Shin

Boeun Lee

Hyo Ree Seo

Sang Eun Park

Wonchang Choi

Ji Ung Kim

Susanto Dieky

Yeojo Yoon

Yong Sang Kim

Agung Nugroho

Hae Ri Lee

Junghoon Ha

Ju Hyeon Ahn

Kyoung Ran Lim

Jon Min Park

Woon Hyuk Choi

Jung Hoon Ha

Chun Mo Yang

Dieky Susanto

Un Seok Kim

Disclosed is a method of preparing a cathode active material useful in a sodium ion secondary battery having high reversible capacity and excellent cycle characteristics. The method for preparing a cathode active material composed of Zr-doped NaLiMOincludes the steps of (A) doping LiMOwith Zrto provide Zr-doped LiMO; and (B) dissociating Li ion from the Zr-doped LiMOand inserting Na ion thereto to provide the Zr-doped NaLiMO, wherein M is selected from Ti, V, Cr, Mn, Fe, Co, Ni, Mo, Ru, and combinations thereof, and wherein 0.005&#x3c;w&#x3c;0.05, 0.8&#x2264;x&#x2264;0.85, 0.09&#x2264;y&#x2264;0.11, 7&#x2264;x/y&#x2264;10, 0.7&#x2264;z&#x2264;0.95, and 1.95&#x2264;a&#x2264;2.05. When the cathode active material is used for manufacturing a cathode for a sodium ion secondary battery, the battery can substitute for a conventional, expensive lithium ion secondary battery.

Cathode active material for sodium ion battery, and preparation process thereof

An in-situ coin cell support device for transmission mode X-ray diffraction analysis capable of controlling temperature. The device includes a coin cell seating unit including a seating part for receiving an in-situ coin cell, a positive electrode tab coupled to the seating part and connected to a positive electrode of the in-situ coin cell, and a negative electrode tab coupled to the seating part and connected to a negative electrode of the in-situ coin cell, a housing having a heat-insulating function, which surrounds the coin cell seating unit such that the positive and negative electrode tabs extend outwards from the housing and which includes one side wall and an opposite side wall arranged opposite each other with the in-situ coin cell interposed therebetween, and a temperature control unit coupled to the exterior of the housing and including an inlet port, an outlet port, and a flow passage.

In-situ coin cell support device for transmission mode X-ray diffraction analysis capable of controlling temperature

Provided is a cathode material for a rechargeable magnesium battery, represented by the chemical formula of AgSSe(0&#x2264;x&#x2264;1), a highly stable cathode material and a rechargeable magnesium battery including the same. The cathode material for a rechargeable magnesium battery has a higher discharge capacity and higher discharge voltage as compared to a typical commercially available cathode material, Chevrel phase, and shows excellent stability in an electrolyte for a rechargeable magnesium battery including chloride ions. In addition, after evaluating the cycle life of the cathode material, the cathode material shows an excellent discharge capacity per unit weight after 500 charge/discharge cycles, and thus is useful for a cathode material for a rechargeable magnesium battery.

Cathode material for rechargeable magnesium battery and method for preparing the same

Disclosed is an anode material for a sodium secondary battery. The anode material includes a tin fluoride-carbon composite composed of a tin fluoride and a carbonaceous material. The anode material can be used to improve the charge/discharge capacity, charge/discharge efficiency, and electrochemical activity of a sodium secondary battery. Also provided are a method for preparing the anode material and a sodium secondary battery including the anode material.

Anode material for secondary battery,secondary battery including the anode material and method for preparing the anode material

Provided is a furnace for a transmission mode X-ray diffractometer and a transmission mode X-ray diffractometer using the same. The furnace for a transmission mode X-ray diffractometer includes a sample heating unit disposed adjacent to a quartz capillary accommodating a sample to heat the sample, and a main body disposed to surround the quartz capillary and the sample heating unit and having an insulating function for allowing the heated sample to maintain a thermal equilibrium state.

Furnace for transmission mode X-ray diffractometer and transmission mode X-ray diffractometer using thereof

Disclosed is a carbon felt impregnated with inorganic particles. The impregnated carbon felt can be used together with sulfur in a cathode of a sodium-sulfur (Na&#x2014;S) battery. Also disclosed is a method for producing the impregnated carbon felt. According to exemplary embodiments, the problem of the prior art can be solved in which inorganic particles such as alumina particles are not directly adhered to carbon felts, thus necessitating complicated processes. In addition, a slurry including an inorganic binder and alumina particles can be used to directly coat the alumina particles on the surface of a carbon felt, making the production procedure very simple. Furthermore, the use of the carbon felt surface coated with the alumina particles in a Na&#x2014;S battery increases the wicking of sodium polysulfides, suppresses the accumulation of sulfur as an insulator on the surface of beta-alumina as an electrolyte, and inhibits non-uniform aggregation of sulfur or sodium polysulfides on the carbon felt, so that the concentration polarization of charges can be reduced without a significant increase in the internal resistance of the battery, achieving high utilization efficiency of sulfur as a reactant.

Carbon felt impregnated with inorganic particles and method for producing the same

Disclosed is a method for carbon coating on lithium titanium oxide-based anode active material nanoparticles. The method includes (a) introducing a lithium precursor solution, a titanium precursor solution and a surface modifier solution into a reactor, and reacting the solutions under supercritical fluid conditions to prepare a solution including nanoparticles of an anode active material represented by LiTiO, (b) separating the anode active material nanoparticles from the reaction solution, and (c) calcining the anode active material nanoparticles to uniformly coat the surface of the nanoparticles with carbon. Further disclosed are carbon-coated lithium titanium oxide-based anode active material nanoparticles produced by the method. In the anode active material nanoparticles, lithium ions are transferred rapidly. In addition, the uniform carbon coating ensures high electrical conductivity, allowing the anode active material nanoparticles to have excellent electrochemical properties.

Method for coating carbon on lithium titanium oxide-based anode active material nanoparticles and carbon-coated lithium titanium oxide-based anode active material nanoparticles produced by the method

Provided are a cathode active material coated with a fluorine-doped spinel-structured lithium metal manganese oxide, a lithium secondary battery including the same, and a method for preparing the same. The cathode active material has improved chemical stability and provides improved charge/discharge characteristics at elevated temperature (55-60&#xb0; C.) and high rate. The cathode active material allows lithium ions to pass through the coating layer with ease and is chemically stable, and thus may be used effectively as a cathode active material for a high-power lithium secondary battery.

Cathode active material coated with fluorine-doped lithium metal manganese oxide and lithium-ion secondary battery comprising the same

The present invention relates to a method for recycling LiFePO, which is an olivine-based cathode material for a lithium secondary battery. The present invention is characterized in that a cathode material including LiFePOis synthesized using, as precursors, amorphous FePO.XHO and crystalline FePO.2HO (metastrengite) obtained by chemically treating LiFePOas an olivine-based cathode material for a lithium secondary battery, which is produced from a waste battery. Since a cathode fabricated from the LiFePOcathode material synthesized according to the present invention does not deteriorate the capacity, output characteristics, cycle efficiency and performance of the secondary battery and the cathode material of the lithium secondary battery may be recycled, the secondary battery is economically efficient.

Recycling method of olivine-based cathode material for lithium secondary battery, cathode material fabricated therefrom, and cathode and lithium secondary battery including the same

Disclosed is an electrolyte solution for a magnesium rechargeable battery with a high ionic conductivity and a wide electrochemical window compared to the conventional electrolyte solution. The electrolyte solution is prepared by dissolving magnesium metal into the ethereal solution using combinations of metal chloride catalysts. The electrolyte solution can be applied to fabricate magnesium rechargeable batteries and magnesium hybrid batteries with a markedly increased reversible capacity, rate capability, and cycle life compared to those batteries employing the conventional electrolyte solution. Also disclosed is a method for preparing the electrolyte.

Electrolyte for magnesium rechargeable battery and preparation method thereof

Disclosed is a cathode active material for a lithium ion secondary battery which includes a lithium manganese borate compound and a manganese oxide. The lithium manganese borate compound contains a larger amount of lithium than conventional lithium manganese borate compounds. Therefore, a larger amount of lithium is deintercalated in a battery including the cathode active material, and as a result, the specific capacity of the battery reaches 100-160 mAh/g, which is much higher than that of conventional lithium ion secondary batteries (&#x3c;80 mAh/g). Also disclosed is a method for producing the cathode active material.

Cathode active material for lithium ion secondary battery including lithium manganese borate compound and manganese oxide, and method for producing the same

Provided are an electrolyte for a magnesium secondary battery having improved ion conductivity and stability, and a method for preparing the same. The electrolyte for a magnesium secondary battery shows higher ion conductivity as compared to the electrolyte according to the related art, increases the dissociation degree of a magnesium halide electrolyte salt, and provides stable electrochemical characteristics. In addition, after determining the capacity, output characteristics and cycle life of the magnesium secondary battery including the electrolyte, the battery provides significantly higher discharge capacity after 100 cycles, as compared to the electrolyte according to the related art. Therefore, the electrolyte may be useful for an electrolyte solution of a magnesium secondary battery.

Electrolyte for magnesium secondary battery and preparation method thereof

The present invention relates to a method for fabricating a LiFePO4 cathode electroactive material for a lithium secondary battery by recycling, and a LiFePO4 cathode electroactive material for a lithium secondary battery, a LiFePO4 cathode, and a lithium secondary battery fabricated thereby. The present invention is characterized in that a cathode scrap is heat treated in air for a cathode electroactive material to be easily dissolved in an acidic solution, and amorphous FePOobtained as precipitate is heat treated in an atmosphere of air or hydrogen so as to fabricate crystalline FePOor FePO. According to the present invention, a cathode scrap may be recycled by using a simple, environmentally friendly, and economical method. Further, a lithium secondary battery fabricated by using a LiFePOcathode electroactive material from the cathode scrap is not limited in terms of performance.

[object Object]

There is provided a preparation method of a sodium vanadium oxide-based (NaVO) anode material for a sodium ion secondary battery synthesized by mixing particles of precursors such as sodium carbonate (NaCO) and vanadium oxide (VO) and pyrolyzing a mixture in a mixed gas atmosphere composed of 90 mol % of nitrogen gas and 10 mol % of hydrogen gas through a solid-state reaction. The sodium vanadium oxide-based anode material prepared according to the present invention shows a small change in volume caused by an initial irreversible capacity and continuous charge/discharge reactions, and thus it is useful for providing a next-generation sodium ion secondary battery having stable charge/discharge characteristics and cycle performance.

Sodium vanadium oxide anode material for sodium ion secondary battery, preparation method thereof and sodium ion secondary battery having the same

A method for synthesizing lithium titanium oxide-based anode active material nanoparticles, and more particularly, a method for synthesizing lithium titanium oxide-based anode active material nanoparticles using a supercritical fluid condition is disclosed herein. The method may include (a) preparing a lithium precursor solution and a titanium precursor solution, (b) forming lithium titanium oxide-based anode active material nanoparticles by introducing the lithium precursor solution and titanium precursor solution into an reactor at a supercritical fluid condition, and (c) cleaning and drying the nanoparticles, and may further include (d) calcinating the nanoparticles at 500-1000&#xb0; C. for 10 minutes to 24 hours after the step (c).

Synthesizing method for lithium titanium oxide nanoparticle using supercritical fluids

Growing community of inventors

Seoul, South Korea

Byung Won Cho