Abstract: The present invention provides a novel hybrid polymer electrolyte, a lithium secondary battery comprising the hybrid polymer electrolyte polymer and their fabrication methods. More particularly, the present invention provides the hybrid polymer electrolyte comprising superfine fibrous porous polymer matrix with particles having diameter of 1-3000 nm, polymers and lithium salt-dissolved organic electrolyte solutions incorporated into the porous polymer matrix. The hybrid polymer electrolyte has advantages of better adhesion with electrodes, good mechanical strength, better performance at low and high temperatures, better compatibility with organic electrolytes of a lithium secondary battery and it can be applied to the manufacture of lithium secondary batteries.

Abstract: The present invention provides a lithium secondary battery and its fabrication method. More particularly, the present invention provides a lithium secondary battery comprising a super fine fibrous porous polymer separator film and its fabrication method, wherein the porous polymer separator film is fabricated by the following process: a) melting at least one polymer or dissolving at least one polymer with organic solvents to obtain at least one polymeric melt or at least one polymeric solution; b) adding the obtained polymeric melt or polymeric solution to barrels of an electrospinning machine; and c) discharging the polymeric melt or polymeric solution onto a substrate using a nozzle to form a porous separator film. The lithium secondary battery of the present invention has the advantages of better adhesion with electrodes, good mechanical strength, better performance at low and high temperatures, better compatibility with organic electrolyte solution of a lithium secondary battery.

Abstract: 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: CH2?CR1COO(CH2CH2O)nCOCR2?CH2 wherein, R1 and R2 are independently hydrogen or methyl group, and n is a integer of 3–20; 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.

Abstract: 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 Řa 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.

Abstract: 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 Řa 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.

Abstract: There is provided a cathode for a lithium secondary battery comprising vanadium oxide as a cathode active material and a conductive material stable in oxygen or sulfur atmosphere such as platinum, a conductive material stable in oxygen or sulfur atmosphere, particularly, platinum added to the vanadium oxide electrode contributes to structural stabilization of the vanadium oxide and to reduction of internal resistance, thereby improving conductivity and cycle in characteristic compared to vanadium oxide electrode without comprising such a conductive material. Accordingly, the cathode of the present invention can be used in various lithium secondary batteries including a thin film battery and bulk battery.

Abstract: 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 a 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: CH2═CR1COO(CH2CH2O)nCOCR2═CH2 wherein, R1 and R2 are independently hydrogen or methyl group, and n is a integer of 3-20; 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.

Abstract: 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 Řa 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.

Abstract: 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 Řa 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.

Abstract: A homogeneous solid polymer alloy electrolyte comprises a total 100 weight % of mixture of (a) from 5 to 90 weight % comprising one of polyacrylonitrile-based (PAN-based) solid polymers and poly(methyl methacrylate)-based (PMMA-based) solid polymers which have superior adhesion and ion conductivity, (b) from 5 to 80 weight % comprising one of poly(vinylidene fluoride)-based (PVdF-based) solid polymers and the PMMA-based solid polymers which have superior compatibility with an organic solvent electrolyte, (c) from 5 to 80 weight % comprising one of poly(vinyl chloride)-based (PVC-based) solid polymers and the PVdF-based solid polymers which have superior mechanical strength. The solid polymer alloy electrolyte has superior ion conductivity, compatibility with an organic solvent and mechanical strength.

Abstract: A fabrication method for a paste-type metal hydride electrode for a nickel/metal hydride battery which includes; pulverizing a V-Ti-Zr-Ni-type and Mm-type hydrogen storage alloy in which a small amount of Pd and/or Ru are combined; mixing K.B.(or Ni powder)+PTFE+CMC(HPMC) undiluted paste solution with the hydrogen storage alloy powder, filling a porous nickel with the mixed paste, drying the paste-filled porous nickel, and press-forming the dried paste and which, by providing the paste-type electrode fabrication, is capable of not lowering the electrode capacity by preventing the oxidation of active material and poor conductivity and has the effect of a preventing significant decrease of the electrode capacity, a remarkable increase in cycle life of electrode, and the realization of a paste-type fabrication of an AB.sub.2 type alloy in accordance with a new paste composition and hydrogen storage alloy composition, which has previously been regarded as impossible.