Abstract: An electric double layer capacitor comprising a pair of electrodes and an electrolytic solution in contact with said pair of electrodes, wherein: the electrolytic solution contains a compound having the formula (1) and an organic solvent. Here, R1 is a group selected from among dimethylene, trimethylene, tetramethylene and pentamethylene, and R2 is tetramethylene or pentamethylene.

Abstract: An electrical double layer capacitor comprises an element and a case which houses the element. The element has an anode charge collector, anode, separator, cathode and cathode charge collector. The anode and cathode consist of a porous layer containing electrically conducting porous particles as a constituent material. The anode charge collector is disposed in electrical contact with the anode. The cathode charge collector is disposed in electrical contact with the cathode. The thickness of the element is 600 ?m or less. The sum of the anode thickness and cathode thickness is set to 80% or less of the thickness of the element.

Abstract: In an electric double layer capacitor 100 comprising an electrochemical element 30 including a pair of electrode layers 32, 36; a pair of container members 10, 20 made of a metal surrounding the electrochemical element 30; and an electrically insulative gasket 40, interposed between the pair of container members 10, 20, for electrically insulating the container members 10, 20 from each other; the electrochemical element 30 is sealed by causing a crimping part 10bof one container member 10 to crimp a brim 20b of the other container member 20 while interposing the gasket 40 between the crimping part 10b of one container member 10 and the brim 20b of the other container member 20, whereas the crimping part 10b of one container member 10 and the brim 20b of the other container member 20 are bonded to each other by the gasket 40.

Abstract: The present invention provides a method of making an electrochemical capacitor electrode comprising a collector and an electronically conductive porous layer formed on the collector, the porous layer containing at least an electronically conductive porous particle and a binder adapted to bind the porous particle; the method comprising a mixing step of mixing the binder and a porous particle with a solvent including an organic solvent usable in a nonaqueous electrolytic solution, the organic solvent existing on a surface of the porous particle. The present invention also provides a porous particle with a solvent, wherein an organic solvent usable in a nonaqueous electrolytic solution exists on a surface of the porous particle having an electronic conductivity.

Abstract: The present invention relates to an electrochemical capacitor, and provides an electrochemical capacitor which has a fully lowered internal resistance and can yield excellent charging/discharging characteristics. The electrochemical capacitor of the present invention is mainly constituted by an anode and a cathode which oppose each other, an insulating separator disposed between the anode and cathode adjacent thereto, an electrolytic solution, and a casing accommodating them in a closed state. The anode contains a substantially spherical carbon material having an electronic conductivity as a constituent material, whereas the cathode contains a fibrous carbon material having an electronic conductivity as a constituent material.

Abstract: An electrochemical device comprises a laminate including a first electrode layer, a separator layer, and a second electrode layer laminated in sequence; an electrolytic solution infiltrating the laminate; and a resin part covering an outer periphery of the laminate. The second electrode layer has an area smaller than the area of the separator layer and the area of the first electrode layer. The surface of the separator layer opposing the second electrode layer is provided with a noncontact part kept away from the second electrode layer. The noncontact part is formed like a ring along the outer periphery of the separator layer. The resin part further covers the noncontact part of the separator layer.

Abstract: An electrochemical device includes electrodes stacked one on the other with a separator intervening between the adjacent electrodes. The electrode includes a current collector and an electrode layer stacked on the current collector via an adhesive resin layer. The electrode layer contains an active material, an electrically conductive auxiliary and a binder resin. At least part of the electrically conductive auxiliary or the active material penetrates the adhesive resin layer to establish an electrical connection with the current collector.

Abstract: An electrochemical device includes electrodes stacked one on the other with a separator intervening between the adjacent electrodes. The electrode includes a current collector and an electrode layer stacked on the current collector via an adhesive resin layer. The electrode layer contains an active material, an electrically conductive auxiliary and a binder resin. At least part of the electrically conductive auxiliary or the active material penetrates the adhesive resin layer to establish an electrical connection with the current collector.

Abstract: One object of the invention is to provide an electrode composition that prevents capacity decreases that occurs when BF-based salts are used and a lithium secondary battery, and another object is to provide a lithium secondary battery having high discharge capacity even at low temperature with no risk of swelling even during storage. These objects are attained by the provision of an electrode composition containing a lithium fluoroborate-based salt in an electrolyte, wherein a poly(vinylidene fluoride) homopolymer is contained at least as a binder and a lactone is contained as an electrolyte solvent while the poly(vinylidene fluoride) homopolymer has been obtained by a emulsion polymerization process, and a lithium secondary battery using the same.

Abstract: An optical recording medium adapted for high density recording with a light of short wavelength which exhibits excellent jitter properties, and its recording method are provided. The optical recording medium recorded and/or reproduced with a light at a wavelength of 600 to 680 nm comprises a substrate having grooves formed on its surface at a track pitch of up to 0.8 .mu.m, and a recording layer containing an organic die disposed on the substrate. Depth A and width B of the groove (.mu.m) and leveling ratio C are in the relation:0.035.ltoreq.A.times.B.ltoreq.0.06, and2.ltoreq.C/A.ltoreq.3.5when the leveling ratio C is represented by the following formula (I):leveling ratio=[thickness of the recording layer on the groove (.mu.m)-thickness of the recording layer on the land (.mu.m)]/[depth of the groove (.mu.