Abstract: The invention relates to a non-aqueous electric double layer capacitor which has a high power output, a high energy density, and has excellent voltage-retention properties.

Abstract: An electric double layer capacitor comprising a positive electrode assembly and a negative electrode assembly, each electrode assembly having a porous layer comprising a carbonaceous powder and a fluorine-containing polymer formed on at least one side of an aluminum foil current collector, the positive electrode and the negative electrode being disposed so that the porous layer of the positive electrode assembly and the porous layer of the negative electrode assembly face each other with a separator interposed therebetween to form an element, the element being impregnated with a non-aqueous electrolyte and accommodated in a sealed container, wherein the thickness of the porous layer is from 80 to 200 &mgr;m, the thickness of the aluminum foil current collector is from 20 to 80 &mgr;m, the thickness of the separator is from 30 to 170 &mgr;m, and the density of the porous layer is from 0.50 to 0.80 g/cm3.

Abstract: An electric double layer capacitor having an element impregnated with a non-aqueous electrolyte, said element comprising positive and negative electrodes made of carbonaceous electrodes, and a separator interposed between the electrodes, wherein said separator is made of at least two paper layers laminated to form one sheet, each of the paper layers has a thickness of from 20 to 60 &mgr;m, and at least one of the paper layers is a cellulose paper layer having a density of from 0.37 to 0.60 g/cm3.

Abstract: An activated carbon for an electric double layer capacitor electrode, which comprises a stacking structure having 2 layers or less of in a proportion stacking of from 25 to 80% and a stacking structure having 5 layers or more in a proportion of from 2 to 30% in the distribution of a stacking structure as obtained by analysis of the X-ray diffraction pattern of (002) plane, and which has a specific surface area of from 500 to 2,800 m2/g and a total pore volume of from 0.5 to 1.8 cm3/g.

Abstract: An electric double layer capacitor comprising an electrode containing a carbonaceous material having a specific surface area of at least 500 m2/g, and an organic electrolytic solution capable of forming an electric double layer at the interface with the electrode, wherein the electrode is bonded to a current collector via a carbon type conductive adhesive layer containing a conductive carbon material and a polyimide resin.

Abstract: This relates to a process for producing an electric double layer capacitor having a low resistance and a large capacitance of at least 10F, and it is an object to provide a process for producing a large capacitance electric double layer capacitor showing little self-discharge, little deterioration with time of the capacitance or little deformation of the cell. The above object is accomplished by forming an element by disposing a positive electrode and a negative electrode made mainly of a carbon material having a specific surface area of at least 500 m2/g to face each other with a separator interposed, impregnating it with a non-aqueous electrolyte, applying a voltage of from 1 to 1.5 times the rated voltage in a non-sealed state, further maintaining the element under reduced pressure and sealing a container accommodating the element.

Abstract: An electric double layer capacitor having an element impregnated with a non-aqueous electrolyte, said element comprising positive and negative electrodes made of carbonaceous electrodes, and a separator interposed between the electrodes, wherein said separator is made of paper prepared to contain at least 50 wt % of fibers obtained by beating regenerated cellulose fibers.

Abstract: An electric double layer capacitor including a positive electrode assembly and a negative electrode assembly, each electrode assembly having a porous layer including a carbonaceous powder and a fluorine-containing polymer formed on at least one side of an aluminum foil current collector, the positive electrode and the negative electrode being disposed so that the porous layer of the positive electrode assembly and the porous layer of the negative electrode assembly face each other with a separator interposed therebetween to form an element, the element being impregnated with a non-aqueous electrolyte and accommodated in a sealed container, wherein the thickness of the porous layer is from 80 to 200 &mgr;m, the thickness of the aluminum foil current collector is from 20 to 80 &mgr;m, the thickness of the separator is from 30 to 170 &mgr;m, and the density of the porous layer is from 0.50 to 0.80 g/cm3.

Abstract: An electric double layer capacitor having an element impregnated with a non-aqueous electrolyte, said element comprising positive and negative electrodes made of carbonaceous electrodes, and a separator interposed between the electrodes, wherein said separator is made of paper prepared to contain at least 50 wt % of fibers obtained by beating regenerated cellulose fibers.

Abstract: An electric double layer capacitor having an element impregnated with a non-aqueous electrolyte, the element comprising positive and negative electrodes made of carbonaceous electrodes, and a separator interposed between the electrodes, wherein the separator is made of paper prepared to contain at least 50 wt % of fibers obtained by beating regenerated cellulose fibers.

Abstract: An electric double layer capacitor comprises a first electrode 31 comprising a belt-like electricity collecting material 31a having both surfaces on which electrode layers 31b, 31c are formed leaving belt-like portions in a side of the belt-like electricity collecting material 31a along its longitudinal direction, a second electrode 32 having the same structure as the first electrode 31, belt-like separators 33a, 33b to electrically insulate the first and second electrodes 31, 32, a post-like winding core 40 on which the first and second electrodes 31, 32 and the separators 33a, 33b are wound to thereby form a cylindrically wound element 50, a first electricity collecting plate 72 in contact with the belt-like portion 31ax, a second electricity collecting plate 62 in contact with the belt-like portion 31ax, wherein the belt-like portions 31ax, 32ax are located at opposing positions in the wound element 50, both ends of the winding core 40 are respectively in contact with the first and second electricity colle

Abstract: An electric double layer capacitor having electrode terminals 70a, 70′a which are attached to a metallic cover plate 65 in an electrically insulated state wherein each of the electrode terminals 70a, 70′a has an engaging plate 76 formed integrally with a shaft portion of the electrode terminal so as to engage with an electrically insulating plate 80 disposed inside the metallic cover plate 65 whereby a rotating motion of the terminal with respect to its axial direction is prevented.

Abstract: An electrode assembly for an electric double layer capacitor, including a current collector made of an aluminum foil, and an electrode including a carbonaceous material having a specific surface area of at least 500 m2/g and a binder, bonded on at least one side of the current collector, wherein the aluminum foil has a roughened layer having a thickness of from 0.5 to 5 &mgr;m on the surface of the side bonded to the electrode and has a breaking energy of at least 3 kg·mm with a dumbbell specimen of No. 1 form as stipulated in JIS K6301.

Abstract: An electric double layer capacitor having a non-aqueous electrolyte impregnated to a capacitor element having a separator placed between a positive electrode and a negative electrode, each being a carbonaceous electrode, wherein the separator includes a plurality of sheets, and at least one of the plurality of sheets is a cellulose paper having a thickness of from 20 to 60 .mu.m and a density of from 0.30 to 0.55 g/cm.sup.3.

Abstract: An electric double layer capacitor including an electrode containing a carbonaceous material having a specific surface area of at least 500 m.sup.2 /g, and an organic electrolytic solution capable of forming an electric double layer at the interface with the electrode, wherein the electrode is bonded to a current collector via a carbon type conductive adhesive layer containing a conductive carbon material and a polyimide resin.

Abstract: An electric double layer capacitor used as a unit capacitor for forming an assembled cell type power source device by connecting a plurality of capacitor elements in series, wherein each of the capacitor elements is formed by impregnating an electrolyte in at least one pair of polarization electrode sheets between which a separator is inserted, wherein a protective circuit in which a Zener diode each having an operation resistance of 10-150 .OMEGA. at the average operation voltage of the electric double layer capacitor are connected in parallel to each of the electric double layer capacitors.

Abstract: An electric double layer capacitor having an electrolyte solution impregnated to an element including a positive electrode and a negative electrode facing each other with a separator interposed therebetween, wherein an electrode containing a carbon material having a specific surface area of at least 500 m.sup.2 /g is used as the positive electrode and/or the negative electrode, and the separator is made of a glass fiber sheet containing from 2 to 60 wt % of glass fibers having fiber diameters of at most 1 .mu.m.

Abstract: An electric double layer capacitor including an electrode containing carbon material as the main component, as a positive electrode and/or a negative electrode, and an electrolyte capable of forming an electric double layer at the interface with the electrode, wherein the carbon material is characterized in that in its Raman spectrum, the ratio of the peak intensity of G-band of an amorphous carbon component to the peak intensity of G-band of a graphite component is at least 0.7, and the ratio of the peak intensity of D-band of the graphite component to the peak intensity of G-band of the graphite component is at least 1.0.

Abstract: An electric double layer capacitor including electrodes made of carbon material as the main component, and an electrolyte capable of forming an electric double layer at the interface with the electrodes, wherein the electrolyte includes an organic type mixed solvent containing propylene carbonate and an asymmetrical chain carbonic acid ester represented by the general formula R.sup.1 OC(.dbd.O)OR.sup.2, wherein R.sup.1 and R.sup.2 are mutually different monovalent organic groups, and a solute comprising a quaternary onium salt.

Abstract: An electric double layer capacitor is provided that includes a positive electrode having a currect collector combined with a polarizable electrode material composed mainly of activated carbon, a negative electrode having a current collector of porous metal incapable of forming an alloy with lithium, combined with a carbonaceous material having lithium ions occluded by a chemical method or an electrochemical method to a carbon material capable of occluding and releasing a lithium ions, and a nonaqueous electrolyte containing a lithium salt. The negative electrode is supported on a current collector of porous metal having a thickness of 0.1 to 1 mm and a porosity of 5 to 80%.