Korea Institute of Science and Technology

Byung-Won Cho

Hyung-Sun Kim

Won-Il Cho

Yong-Tae Kim

Hee-Woo Rhee

Joong-Kee Lee

Kyung-Suk Yun

Sang-Cheol Nam

Young-Soo Yoon

Un-Seok Kim

Kyung-Yoon Chung

Un-Sek Kim

Hyun-Joong Kim

Kyung Yoon Chung

Min-Kyu Song

Seung-Won Lee

Hwa Young Lee

Young-hwan Jung

Dal-Keun Park

Joo-Man Woo

Bup-Ju Jeon

Chun-Mo Yang

Taeg-Kwan Kang

Disclosed are a recovery for a metaloxidic cathodic active material for a lithium ion secondary battery and a synthesis thereof by the recovery method, wherein the recovery method includes (a) dissolving a cathodic active material from a waste lithium ion secondary battery using sulfuric acid solution containing sulfurous acid gas to generate a solution containing metal ions, (b) injecting sodium hydroxide solution and ammonia solution in the solution containing the metal ions to fabricate an electrode active material precursor, and (c) filtrating the active material precursor, followed by drying and grinding, thus to fabricate a solid-state cathodic active material precursor, and the synthesis method is achieved by mixing the electrode active material precursor fabricated according to the recovery method with lithium carbonate or lithium hydroxide, followed by heat treatment, to generate a metaloxidic cathodic active material.

Recovery and synthesis method for metaloxidic cathodic active material for lithium ion secondary battery

Disclosed is a fabrication method for an electrode active material, and a lithium battery comprising an electrode active material fabricated therefrom. The fabrication method for an electrode active material comprises preparing an aqueous solution by dissolving a precursor that can simultaneously undergo positive ion substitution and surface-reforming processes in water; mixing and dissolving raw materials for an electrode active material with a composition ratio for a final electrode active material in the aqueous solution, thereby preparing a mixed solution; removing a solvent from the mixed solution, thereby forming a solid dry substance; thermal- processing the solid dry substance; and crushing the thermal-processed solid dry substance.

Fabrication method for electrode active material and lithium battery comprising electrode active material fabricated therefrom

Disclosed are a silicon thin film anode for a lithium secondary battery having enhanced cycle characteristics and capacity and a preparation method thereof. A preparation method for a silicon thin film anode for a lithium secondary battery, comprises: preparing a collector including a metal; forming an anode active material layer including a silicon on the collector; forming one or more interface stabilizing layer, by annealing the collector and the anode active material layer under one of an inert atmosphere, a reduced atmosphere, and a vacuum atmosphere to react a metallic component of at least one of the collector and the anode active material layer with a silicon component of the anode active material layer at an interface therebetween; and forming a carbon coating layer on the anode active material layer by performing an annealing process in a hydrocarbon atmosphere.

Silicon thin film anode for lithium secondary battery and preparation method thereof

The present invention relates to a multi-layered, UV-cured polymer electrolyte and lithium secondary battery comprising the same, wherein the polymer electrolyte comprises: A) a separator layer formed of polymer electrolyte, PP, PE, PVdF or non-woven fabric, wherein the separator layer having two surfaces; B) at least one gelled polymer electrolyte layer located on at least one surface of the separator layer comprising: a) polymer obtained by curing ethyleneglycoldi(meth)acrylate oligomer of the formula (I) by UV irradiation: CH&#x2550;CRCOO(CHCHO)COCR&#x2550;CHwherein, Rand Rare independently hydrogen or methyl group, and n is a integer of 3&#x2013;20; and b) at least one polymer selected from the group consisting of PVdF-based polymer, PAN-based polymer, PMMA-based polymer and PVC-based polymer; and C) organic electrolyte solution in which lithium salt is dissolved in a solvent.

Multi-layered, UV-cured polymer electrolyte and lithium secondary battery comprising the same

The present invention relates to a UV-cured multi-component polymer blend electrolyte, lithium secondary battery and their fabrication method, wherein the UV-cured multi-component polymer blend electrolyte, comprises: A) function-I polymer obtained by curing ethyleneglycoldi-(meth)acrylate oligomer of formula 1 by UV irradiation, CH&#x2550;CRCOO(CHCHO)COCR&#x2550;CH(1) wherein, Rand Rare independently a hydrogen or methyl group, and n is an integer of 3-20; B) function-II polymer selected from the group consisting of PAN-based polymer, PMMA-based polymer and mixtures thereof; C) function-III polymer selected from the group consisting of PVdF-based polymer, PVC-based polymer and mixtures thereof; and D) organic electrolyte solution in which lithium salt is dissolved in a solvent.

UV-cured multi-component polymer blend electrolyte, lithium secondary battery and their fabrication method

A system for chemical vapor deposition at ambient temperature using electron cyclotron resonance (ECR) comprising: an ECR system; a sputtering system for providing the ECR system with metal ion; an organic material supply system for providing organic material of gas or liquid phase; and a DC bias system for inducing the metal ion and the radical ion on a substrate is provided, and a method for fabricating metal composite film comprising: a step of providing a process chamber with the gas as plasma form using the ECR; a step of providing the chamber with the metal ion and the organic material; a step of generating organic material ion and radical ion by reacting the metal ion and the organic material with the plasma; and a step of chemically compounding the organic material ion and the radical ion after inducing them on a surface of a specimen is also provided.

System for chemical vapor deposition at ambient temperature using electron cyclotron resonance and method for depositing metal composite film using the same

A method for fabricating carbon electrode coated with a porous metal film includes the steps of: positioning a roll of carbon material within a vacuum chamber; winding the carbon material off the roll at a certain speed, winding the carbon material on a different roll while coating a porous metal to a thickness of a few &angst;&tilde;a few &mgr;m on the carbon material between the two rolls from a metal evaporation source; and stabilizing the thusly coated carbon material under a vacuum. The coated porous metal film is of Li, Al, Sn, Bi, Si, Sb, Ni, Cu, Ti, V, Cr, Mn, Fe, Co, Zn, Mo, W, Ag, Au, Pt, Ru, Ir, In or their alloys. Since the stable film is formed on the surface of the carbon material, when the thusly coated carbon material is use for forming a cathode electrode of a secondary battery, the reversibility and high rate charging and discharging characteristics of the carbon electrode can be improved. In addition, when a lithium-ion secondary battery is fabricated using the carbon electrode coated with lithium or a lithium alloy, the capacity degradation due to the irreversible capacity of the conventional carbon electrode appearing at the initial state of charging can be prevented, so that the capacity can be increased.

Carbon electrode coated with porous metal film, its fabrication method and lithium secondary battery using the same

A metal oxide electrode coated with a porous metal film, a metal oxide film or a carbon film, its fabrication method and a lithium-ion secondary battery using it are disclosed. The porous thin film of Li, Al, Sn, Bi, Si, Sb, Ni, Cu, Ti, V, Cr, Mn, Fe, Co, Zn, Mo, W, Ag, Au, Pt, Ir, Ru, carbon or their alloys are coated to a few &angst;&tilde;a few &mgr;m, so as to remarkably improve the capacity of a battery, high rate charging and discharging characteristics and a durability characteristic. The method can be applied to a fabrication of every secondary battery.

Metal oxide electrode coated with porous metal film, porous metal oxide film or porous carbon film, its fabrication method, and lithium-ion secondary battery using it

Disclosed is an electric double-layered capacitor fabricated by inserting a UV-curing gel type polymer electrolyte having excellent characteristics of ion conductivity, adhesion to electrode, compatibility with an organic solvent electrolyte, mechanical stability, permeability, and applicability to process, between electrodes. Accordingly, the present invention increases its storage capacitance, reduces self-discharge of electricity, and decreases inner cell resistance.

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Seoul, South Korea

Byung-Won Cho