Abstract:
PURPOSE: Provided are an inorganic ceramic filler of micro size, which is used as complex polyelectrolyte of lithium polymer battery, and which can increase an ion conductivity and mechanical strength of electrolyte and thus improve a capability of the lithium polymer battery, and an electrolyte comprising the same. CONSTITUTION: The powder of titanium oxide, the mixed powder of lithium oxide and lead oxide, and the powder of lead oxide, which have micro size, are used as a filler for complex polyelectrolyte of lithium polymer battery. The titanium oxide powder is produced by ball milling pure titanium powder or titanium having a spongy form; the mixed powder of lithium oxide and lead oxide is produced by ball milling pure lead and lithium sulfate; and lead oxide powder is produced by ball milling pure lead. The electrolyte is produced by dissolving 5-15 parts by weight of a filler consisting of 100 parts by weight of binder, 50 parts by weight of lithium salt, and any one of the powders in a high molecular solvent.
Abstract:
PURPOSE: Provided is a polymer electrolyte having improved mechanical strength, which is produced by adding a porous material having channels capable of the migration of ions to an ion conductive polymer. CONSTITUTION: The process comprises the steps of: stirring the ion conductive polymer selected from the group consisting of polyethylene oxide, polyacrylonitrile, and polyvinylidene fluoride for about 12 hours; impregnating a thin film of the porous material with the stirred ion conductive polymer and drying at an ordinary temperature, wherein the film type porous material is fabric, paper, or a polymer such as polypropylene and polyurethane; redrying the polymer electrolyte at 60deg.C for 12 hours under vacuum.
Abstract:
PURPOSE: Provided is a method for preparing a polymer electrolyte for a lithium sulfur battery, which has one flat voltage ranged from 2.1V to 3.0V and discharge capacity of 800 mAh/g(sulfur) or more and excellent ion conductivity. CONSTITUTION: The method for preparing a cold polymer electrolyte is characterized by comprising the steps of: dissolving at least one binder selected from the group consisting of a polyurethane, a polyvinylidene hexafluoropropylene copolymer, a polyvinylidene fluoride, a polyvinyl chloride, a polyacrylonitrile, a polymethylmethacrylate, a polyethylene oxide and a polypropylene oxide, at least one plasticizer selected from the group consisting of tetraethyleneglycol dimethyl ether, ethylene carbonate, propylene carbonate and a mixture thereof, and a lithium salt; and forming the polymer electrolyte into gels by glass casting. Alternatively, the method comprises the steps of: preparing the binders in the form of a porous polymeric film; impregnating the porous polymeric film with the solution containing the plasticizer and a lithium salt; and forming an ion-conductive microporous polymer electrolyte by glass casting.