Abstract: Provided are an additive to an electrode for a fuel cell that is a proton conductive compound having at least one phosphate group, an electrode for a fuel cell including the same, a method of manufacturing the electrode for a fuel cell, and a fuel cell using the electrode. The additive to an electrode for a fuel cell improves the durability of a fuel cell and reduces the amount of phosphoric acid discharged during operation of the fuel cell by fixing the phosphoric acid. Accordingly, a fuel cell having improved efficiency may be prepared using the additive because of improved proton conductivity and durability.

Abstract: Provided are a lithium secondary battery with suppressed decomposition of an electrolytic solution, and a preparation method thereof. The lithium secondary battery includes a current collector, a cathode and an anode having each active material layer formed on the current collector, and a polymer electrolyte interposed between the cathode and the anode. In the lithium secondary battery, a fluorine resin film is formed on at least one surface of the active material layers of the cathode and the anode. A fluorine resin exists in pores between constituents contained in at least one active material layer of the cathode and the anode. The polymer electrolyte is a polymerized product of a crosslinking monomer and an electrolytic solution including a lithium salt and an organic solvent. Also, a porous membrane made of an insulating resin is interposed between the cathode and the anode.

Abstract: An organic electrolytic solution for a lithium-sulfur battery that can improve discharge capacity and cycle life of the battery, and a lithium-sulfur battery using the organic electrolytic solution are provided. The electrolytic solution includes a lithium salt, an organic solvent, and further a phosphine sulfide-based compound represented by formula (I) below: wherein R1, R2 and R3 are the same or different from each other, and each represents one selected from the group consisting of a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C1-C30 alkoxy group and a substituted or unsubstituted C8-C30 aralkenyl group. The electrolytic solution including the phosphine sulfide-based compound represented by Formula (I) can suppress production of lithium sulfides so that a reduction in battery capacity can be prevented.

Abstract: A non-aqueous electrolytic solution and a lithium battery employing the same are provided. The non-aqueous electrolyte solution that contains a substituted or unsubstituted acetate can effectively stabilize lithium metal and improve the conductivity of lithium ions.

Abstract: Provided are a lithium secondary battery with suppressed decomposition of an electrolytic solution, and a preparation method thereof. The lithium secondary battery includes a current collector, a cathode and an anode having each active material layer formed on the current collector, and a polymer electrolyte interposed between the cathode and the anode. In the lithium secondary battery, a fluorine resin film is formed on at least one surface of the active material layers of the cathode and the anode. A fluorine resin exists in pores between constituents contained in at least one active material layer of the cathode and the anode. The polymer electrolyte is a polymerized product of a crosslinking monomer and an electrolytic solution including a lithium salt and an organic solvent. Also, a porous membrane made of an insulating resin is interposed between the cathode and the anode.

Abstract: An organic electrolytic solution containing an organic solvent and a compound that contains an anionic polymerization monomer with an added component capable of being chelated with a lithium metal cation. A lithium battery may utilize the organic electrolytic solution. The lithium battery may have improved stability to reductive decomposition, reduced first cycle irreversible capacity, and improved charging/discharging efficiency and lifespan. Moreover, reliability of the battery may be improved because the battery, after formation and standard charging at room temperature, may not swell beyond a predetermined thickness. Even when the lithium battery swells significantly at a high temperature, the capacity of the lithium battery may be high enough for practical applications due to its recovery capacity.

Abstract: An electrode for a fuel cell, a method of preparing the same, and a fuel cell employing the same. More particularly, provided are an electrode for a fuel cell, including a catalyst layer including a supporting material, a catalyst, and a binder, wherein the specific surface area of the supporting material is at least 500 m2/g, and wherein the binder includes an amount of fluorinated ethylene propylene copolymer in the range of 0.5 to 50 parts by weight based on 100 parts by weight of the total amount of the supporting material and the catalyst, a method of preparing the same, and a fuel cell employing the same. The electrode has superior water repellency even when a relatively small amount of binder is used compared to a conventional electrode, and as a result, efficiency of a supported catalyst is maximized.

Abstract: The present invention relates to an electrolytic solution for a lithium battery and a lithium battery using the same. The organic electrolytic solution includes a lithium salt, a mixed organic solvent comprising a high dielectric constant solvent and a low boiling-point solvent, and an additive. The additive used in the electrolytic solution is a heterocyclic compound of Formula (1): where R1, R2 and R3 may each independently be a C1-C10 linear or branched alkyl group; R4 may be a C1-C10 linear or branched alkylene group; X may be a heterocyclic ring containing N and O whereby a tetraallkyl orthosilicate functional group may be linked to N. The lithium battery using the organic electrolytic solution of the present invention is highly reliable and maintains a constant thickness during a charge/discharge cycle.

Abstract: A polymer electrolyte membrane for use in a fuel cell and a method of producing a polymer electrolyte membrane. The method includes preparing a phosphate monomer solution by dissolving an initiator and a phosphate monomer containing at least one phosphoric acid group and at least one unsaturated bond in a solvent, impregnating a porous polymer matrix with the phosphate monomer solution, polymerizing the impregnated phosphate monomer, and impregnating the result of polymerization with a phosphoric acid.

Abstract: A proton conductive electrolyte including a polymerized polyurethane, polyethylene(metha)acrylic acid (PEAA), and a cross-linking agent mixture; a method of preparing the same; an electrode including a support and a catalyst layer, the catalyst layer including a supported catalyst and a polymerized mixture of a polyurethane based compound and a polyethylene(metha)acrylic acid; a method of preparing the electrode; and a fuel cell including the proton conductive electrolyte and/or the electrode. The proton conductive electrolyte can be prepared at lower costs than conventionally used polybenzimidazole and NAFION and can be easily formed into a membrane with a controlled thickness by casting. The polymer electrolyte membrane has high mechanical strength, flexibility, and excellent ionic conductivity. The electrode remains stable under high temperature operation, a strong binding force is maintained between the support and the catalyst layer, and the electrode has excellent ionic conductivity.

Abstract: A polymer electrolyte membrane, a method of preparing the polymer electrolyte membrane, and a fuel cell including the polymer electrolyte membrane are disclosed in which the polymer electrolyte membrane includes a porous polymer matrix, and an ionic conductive polymer layer coated on the external surfaces of single fibers and inside pores of the porous polymer matrix.

Abstract: An electrode including a binder comprising a waterborne polyurethane polymer compound and an electrode active material is provided. The waterborne polyurethane polymer compound improves the binding properties of the electrode. In addition, the polymer compound disperses well in water and is hardened through a crosslinking reaction to increase elastic force, thereby enabling adjustment of elastic and binding forces. As a result, a battery including the polymer compound has excellent recovery and charge/discharge properties.

Abstract: Provided are a fluoride copolymer, a polymer electrolyte comprising the fluoride copolymer, and a lithium battery employing the polymer electrolyte. The polymer electrolyte preferably includes as the fluoride copolymer at least one fluoride polymer selected from a polyethylene glycol methylether (meth)acrylate (PEGM)A)-2,2,2-trifluoroethylacrylate (TFEA) polymer, a PEGMA-TFEA-acrylonitrile (AN) polymer, a PEGMA-TFEA-methyl methacrylate (MMA) polymer, a PEGMA-TFEA-vinylpyrrolidone (VP) polymer, a PEGMA-TFEA-trimethoxyvinylsilane (TMVS) polymer, and a PEGMA-TFEA-ethoxy ethylacrylate (EEA) polymer.

Abstract: An organic electrolytic solution and a lithium battery employing the same are provided. The organic electrolytic solution includes: a lithium salt; an organic solvent containing a high dielectric constant solvent and a low boiling point solvent; and a dicarboxylic acid derivative having at least one substituted silyl group. The organic electrolytic solution and the lithium battery employing the same have improved reductive decomposition stability, thereby decreasing an irreversible capacity after a first cycle and improving the charge/discharge efficiency and lifespan of the battery. The lithium battery has non-varying chemical properties at room temperature and a uniform thickness after standard charging, and thus has high reliability.

Abstract: A positive electrode which has a positive active material layer formed on a conductive substrate and a polymer film coated on the positive active material layer, wherein the positive active material layer includes a positive active material, pores of which are filled with a polymeric material containing a nonaqueous electrolyte, and the polymer film, and the polymer film formed of the polymeric material containing the nonaqueous electrolyte. The polymeric material is formed by polymerization of a composition comprising a monomer and the nonaqueous electrolyte. The monomer includes 1 to 6 functional groups per molecule, and the functional groups are selected from the group consisting of vinyl, allyl, acryl, methacryl and epoxy group.

Abstract: An organic electrolytic solution and a lithium battery employing the same are provided. The organic electrolytic solution includes: a lithium salt; an organic solvent containing a high dielectric constant solvent and a low boiling point solvent; and a carbonate or oxalate derivative having at least one substituted or unsubstituted cyano group. The organic electrolytic solution and the lithium battery employing the same have improved reductive decomposition stability, thereby decreasing an irreversible capacity after a first cycle and improving the charge/discharge efficiency and lifespan of the battery. The lithium battery has non-varying chemical properties at room temperature and a uniform thickness after standard charging, and thus has high reliability.

Abstract: A proton conductor includes a molecule with a hydroxy group arranged at a terminal end and an ether-based functional group arranged at an ?-carbon position. The proton conductor may be used to impregnate a polymer matrix to form a polymer electrolyte.

Abstract: A polymer electrolyte that may be used in a fuel cell includes sulfonated polyether ketone ketone and a cross-linking agent.

Abstract: The present invention relates to a polymer electrolyte membrane that includes a porous polymer matrix and an ion conducting polymer coating membrane formed in the outer surface of single fibers in the porous polymer matrix. The polymer electrolyte membrane can provide excellent mechanical strength, is not deteriorated by heat even at a temperature higher than 100°C., can provide excellent ion conductivity even at non-humidified state. Thus it is suitable for use in a fuel cell that is operated at high temperatures.

Abstract: The present invention provides a novel non-humidified polymer electrolyte and a fuel cell including the same. The non-humidified polymer electrolyte comprises an ion medium comprising an organic compound that has a boiling point greater than 100° C. and a dielectric constant greater than 3. The non-humidified polymer electrolyte further comprises a matrix comprising an ion conducting polymer, wherein the ion medium is impregnated into the matrix.