Abstract: Devices which internally control and regulate voltage of a super-capacitor cell or stack thereof during charge-discharge cycles, methods for controlling and regulating voltage of a super-capacitor cell or stack thereof with these devices and methods for production of the devices are provided.

Abstract: The present invention relates to a supercapacitor and a method for expanding the voltage range of an aqueous electrolyte supercapacitor.

Abstract: The present invention relates to a supercapacitor and a method for expanding the voltage range of an aqueous electrolyte supercapacitor.

Abstract: Devices which internally control and regulate voltage of a super-capacitor cell or stack thereof during charge-discharge cycles, methods for controlling and regulating voltage of a super-capacitor cell or stack thereof with these devices and methods for production of the devices are provided.

Abstract: Methods and systems for electrical determination and adjustment of the fuel concentration in direct methanol fuel cells (DMFC) are provided.

Abstract: Modified fuel cells with improved distribution of humidity and/or temperature are provided.

Abstract: Dual function, bipolar separator plates are provided for use in fuel cells. These separator plates contain both a cathodic flow field and an anodic flow field in a single separator plate.

Abstract: Methods and systems for electrical determination and adjustment of the fuel concentration in direct methanol fuel cells (DMFC) are provided.

Abstract: Membrane Electrode Assemblies for Polymer Electrolyte Hydrogen and Direct Methanol Fuel Cells and Methods for Their Production Electrodes and membrane electrode assemblies for use in fuel cells are provided containing a plurality of layers of catalyst and binder, wherein the first layer (2a, 2b) adjacent to the PEM (1) of the plurality of layers (3a, 3b, 4a, 4b, 5a, 5b) contains a higher concentration of catalyst as compared to each subsequent layer of the electrode.

Abstract: Dual function, bipolar separator plates are provided for use in fuel cells. These separator plates contain both a cathodic flow field and an anodic flow field in a single scpararator plate.

Abstract: Modified fuel cells with improved distribution of humidity and/or temperature are provided.

Abstract: The invention relates to a method for the preparation of a polymer electrolyte electrochemical cell using an electrolyte precursor, said precursor comprising one or more solvents, one or more salts and a polymer which dissolves in the solvent at a first temperature (Tdissol) and which is capable of forming a gel on subsequent cooling following heating to a second temperature (Tgel). Tdissol being lower than Tgel, which method comprises: (a) heating the electrolyte precursor to Tdissol; (b) optionally cooling the electrolyte precursor, (c) incorporating the electrolyte precursor into the electrochemical cell; (d) heating the electrochemical cell to Tgel; (e) cooling the polymer electrochemical cell to ambient temperature to bring about gelling of the polymer electrolyte. Preferably the polymer is a homopolymer or copolymer from the group of monomers of vinyl fluoride, vinylidenefluoride, trifluoroethylene, tetrafluoroethylene and hexafluoropropylene.

Abstract: A method of producing a membrane electrode assembly for use in direct methanol fuel cells by serigraphically printing cathode catalysts or anode catalysts with a carbon backing layer onto graphite or carbon paper, boiling impurities from these layers, and bonding the boiled, printed cathode and anode catalyst layers onto opposite sides of a polymer electrolyte membrane via semi-isostatic compression in a constraint which restricts volume and lateral defamation is provided. Also provided are membrane electrode assemblies produced in accordance with this method.

Abstract: The present invention provides radio frequency resonant tags and methods of manufacturing these tags for use in detection of theft of article for sale. In these tags, the radio frequency is transmitted through a resonance circuit without the need for direct connection of a conducting pattern or conducting patterns, but rather via a dielectric film which is adjacent to the conducting pattern or separates the conducting patterns.

Abstract: The present invention provides radio frequency resonant tags and methods of manufacturing these tags for use in detection of theft of article for sale. In these tags, the radio frequency is transmitted through a resonance circuit without the need for direct connection of a conducting pattern or conducting patterns, but rather via a dielectric film which is adjacent to the conducting pattern or separates the conducting patterns.

Abstract: A method of producing a membrane electrode assembly for use in direct methanol fuel cells by serigraphically printing cathode catalysts or anode catalysts with a carbon backing layer onto graphite or carbon paper, boiling impurities from these layers, and bonding the boiled, printed cathode and anode catalyst layers onto opposite sides of a polymer electrolyte membrane via semi-isostatic compression in a constraint which restricts volume and lateral defamation is provided. Also provided are membrane electrode assemblies produced in accordance with this method.

Abstract: The present invention relates to an electrochemical cell composed of a laminate of two electrode structures in the form of current collectors coated with electrode material interposed electrolyte structures. The laminate is wound in a coil, and in at least the initial turn and the final turn, one of the current collectors has a protruding part extending beyond at least one of the edges of the other current collector in the same turn and in the following or previous turn, respectively, and the first current collector has a protruding part extending beyond one of the edges of the second collector foil, the protruding parts of the current collectors along the first and the second edge, respectively, of the laminate are sealed to each other optionally with interposed insulating polymer material.

Abstract: The instant invention is to an electrolyte consisting essentially of a salt mixture and a solvent mixture. The solvent mixture consists essentially of ethylene carbonate and dimethyl carbonate and the salt mixture consists of 60-90% lithium tetrafluoroborate and 10-40% lithium hexafluorophosphate. A battery comprising this electrolyte and a method of preparing this electrolyte are exhibited.

Abstract: Modified cokes or blacks suitable as alkali metal intercalation electrodes in electrochemical cells are produced by a method comprising boiling the coke or black in concentrated hydrochloric acid, flushing with distilled water, sonicating the coke or black in acetone, and drying the coke or black at a temperature of 150 to 300° C. The modified cokes and blacks produced by this method show Intercalation capacities up to 50% higher than unmodified cokes and blacks, and maintain the high electrolyte compatibility, rate capability and cyclability of the cokes or blacks.

Abstract: The invention relates to a cheap and fast method for the production of electrode/current collector laminates, the electrode layer having a thickness of at least 20 &mgr;m. The current collector foil is provided with an electrode paste coating on at least one of its sides by filling paste into the cells or grooves of a patterned matrice roll; transferring paste from the matrice roll onto the current collector foil by a printing operation involving contacting the matrice roll and the current collector foil or alternatively contacting the matrice roll with an offset roll which in turn is in contact with the current collector foil; drying the layer of paste printed onto the current collector; and optionally repeating the process until the desired thickness of the electrode layer is obtained.