Electronics and Telecommunications Research Institute

Korea Atomic Energy Research Institute

Korea Hydro Nuclear Power Co., Ltd.

Yong Joon Park

Kwang Sun Ryu

Soon Ho Chang

Young Gi Lee

Kyuseok Song

Sang Eun Bae

Xianglan Wu

Kwang Man Kim

Young Sik Hong

Nam Gyu Park

Jei-Won Yeon

Dae Hyeon Kim

Jei Won Yeon

Jong-Yun Kim

Man Gu Kang

Young-Hwan Cho

Jong Yun Kim

Yong Sik Hong

Xiang Lan Wu

Hong-Joo Ahn

Young-Sik Hong

A monitoring method of metal ions or oxygen ions applicable to a high concentration non-aqueous electrolyte includes: applying a potential in a non-aqueous electrolyte to obtain current information with respect to the potential; varying the potential applied in the non-aqueous electrolyte containing metal ion concentration or oxygen ion concentration such that the metal ion concentration or the oxygen ion concentration is maintained in spite of the potential being applied; detecting a linear relationship among the concentration, the current, and passed charges in the non-aqueous electrolyte by repeatedly performing the obtaining step and the varying step, while changing the concentration; and calculating metal ion concentration or oxygen ion concentration of the non-aqueous electrolyte in pyroprocessing of the non-aqueous electrolyte by using the linear relationship. Concentration and components of a solute existing in a non-aqueous electrolyte can be measured while an electrowinning process and pyroprocessing is being conducted.

Monitoring method and system of metal ions or oxygen ions applicable to high concentration non-aqueous electrolyte

The present invention relates to an electronic scale having an air pressure change compensation function, which can precisely measure the weight of an object to be weighed even in an environment in which air pressure changes moment by moment in an airtight space such as in a glove box. According to the present invention, there is provided an electronic scale having an internal air pressure measurement sensor, by which the function of correcting the weight of an object to be weighed is provided even in an environment in which air pressure changes such as in the glove box is provided, thus enabling the weight of a sample to be precisely measured even in an environment in which air pressure changes moment by moment.

Electronic scale having function of compensating for air pressure changes in glove box

A device for on-site measurement of concentration of uranium in high temperature molten salts is provided. More particularly, this device can be directly applied to a pyroprocess for reusing spent nuclear fuel and determine concentration of uranium 3+ and 4+ chemical species using ultraviolet-visible light absorption spectrometry. The device includes first and second optical waveguides submerged in molten salts including uranium through a port formed at an upper side of a pyrochemical process apparatus; a lengthwise driver installed at the port to be operated to adjust a distance between the optical waveguides; a light source for supplying light to the second optical waveguide as any one of the optical waveguides; and a spectrometer connected to the first optical waveguide as the other one of the optical waveguides to analyze the light emitted from the second optical waveguide and introduced through the first optical waveguide via the molten salts.

Device for on-site measurement of concentration of uranium in high temperature molten salts

There are provided an anode for a lithium metal polymer secondary battery comprising an anodic current collector having a surface on which a plurality of recesses having a predetermined shape are formed and a method of preparing the same. The plurality of recesses are formed on a surface of the anodic current collector using a physical method or a chemical method. In a lithium metal polymer secondary battery employing the anode, oxidation/reduction of lithium and the formation of dendrite occur only in the recesses formed by surface patterning of the anodic current collector. Thus, expanding and shrinking of a battery due to a change in the thickness of the lithium anode can be prevented and cycling stability and the lifespan of a battery can be improved.

Anode for lithium metal polymer secondary battery comprising surface patterned anodic current collector and method of preparing the same

Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[LiCrTiMn]Owhere 0&#x2266;x&#x2266;0.3, 0&#x2266;y&#x2266;0.3 and 0.1&#x2266;x+y&#x2266;0.3, and layered a-LiFeOstructure. A method of synthesizing the lithium-chromium-titanium manganese oxide includes preparing a first mixed solution by dispersing titanium dioxide (TiO) in a mixed solution of chrome acetate (Cr(OH)(CHCO)) and manganese acetate ((CHCO)Mn.4HO), adding a lithium hydroxide (LiOH) solution to the first mixed solution to obtain homogeneous precipitates, forming precursor powder that has the formula Li[LiCrTiMn]Owhere 0&#x2266;x&#x2266;0.3, 0&#x2266;y&#x2266;0.3 and 0.1&#x2266;x+y&#x2266;0.3 by heating the homogeneous precipitates, and heating the precursor powder to form oxide powder having a layered structure.

Cathode composition for lithium batteries and method of preparing the same

Provided is a lithium-cobalt-manganese oxide having the formula Li[CoLiMn]O(0.05&#x3c;X&#x3c;0.9) which provide a stable structure and a superior discharge capacity, and the method of synthesizing of the same. The method of synthesizing the oxides according to the present invention comprises: preparing an aqueous solution of lithium salt, cobalt salt, and manganese salt; forming a gel by burning the aqueous solution; making oxide powder by burning the gel; forming a fine oxide powder having a layered structure by the twice of treatments. The lithium-cobalt-manganese oxide synthesized according to the present invention has a stable and superior electrochemical characteristic. The oxide is synthesized by simple and low cost heat treatment process.

Li-Co-Mn oxide as cathode material for lithium batteries and method of synthesis of the same

A cathode active material for a lithium secondary cell used in a cellular phone is disclosed. The cathode active material for the lithium secondary cell and the method the same having a high capacity and a long lifetime, different from LiCoOand LiMnO, Li(Ni, Co)O, and V-system oxide that has been researched as the active material for substituting LiCoOare provided. The cathode active material for the lithium secondary cell in the next formula 1 is obtained by heating or chemically treating diadochite [Fe(PO)(SO)(OH).6HO] that is the mineral containing PO, SO, and OH.LiFeM(PO)(SO)(OH)&#x2003;&#x2003;(1) In the formula, M is at least one element selected from a radical consisting of Mg, Ti, Cr, Mn, Co, Ni, Cu, Zn, Al, and Si, with 0&#x2266;a, c&#x2266;0.5, 1&#x2266;b&#x2266;2, 0.5&#x2266;x, y, z&#x2266;1.5.

Cathode active material for lithium secondary cell and method for manufacturing the same

A method of preparing layered lithium-chromium-manganese oxides having the formula Li[CrLiMn]Owhere 0.1&#x2266;X&#x2266;0.5 for lithium batteries. Homogeneous precipitation is prepared by adding lithium hydroxide (LiOH) solution to a mixed solution of chromium acetate (Cr(OH)(CHCO)) and manganese acetate ((CHCO)Mn.4HO), while precursor powders are prepared by firing the precipitation. After that, the precursor powders are subjected to two heat treatment to yield Li[CrLiMn]Owith &#x3b1;-LiFeOstructure.

Method of preparing layered lithium-chromium-manganese oxides for lithium batteries

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Daejeon, South Korea

Yong Joon Park