This invention relates to electric double layer capacitor utilizing electric double layer formed at interface between polarizable electrode and electrolyte, and carbon fibers or activated carbon fibers are used as polarizable electrode (17), and on the polarizable electrodes (17) consisting of the c
This invention relates to electric double layer capacitor utilizing electric double layer formed at interface between polarizable electrode and electrolyte, and carbon fibers or activated carbon fibers are used as polarizable electrode (17), and on the polarizable electrodes (17) consisting of the carbon fibers or activated carbon fibers conductive electrodes (18) as collectors are formed to constitute electrode parts.
대표청구항▼
1. An electric double layer capacitor having an electric double layer formed at an interface between a polarizable electrode and an electrolyte, wherein said polarizable electrode consists of carbon fibers or activated carbon fibers, a conductive electrode formed on one face of said polarizable elec
1. An electric double layer capacitor having an electric double layer formed at an interface between a polarizable electrode and an electrolyte, wherein said polarizable electrode consists of carbon fibers or activated carbon fibers, a conductive electrode formed on one face of said polarizable electrode and an opposing electrode disposed on the other side of said polarizable electrode with said electrolyte inbetween. 2. An electric double layer capacitor of claim 1, wherein a polarizable electrode consisting of carbon fibers or activated carbon fibers, with a conductive electrode formed on one face thereof, is used as said opposing electrode. 3. An electric double layer capacitor of claim 1, wherein a non-polarizable electrode is used as said opposing electrode. 4. An electric double layer capacitor of claim 1, wherein an electric conductivity improving agent for increasing conductivity is carried on one or both faces of said polarizable electrode. 5. An electric double layer capacitor of claim 4, wherein said conductivity improving agent is selected from a conductive transition metal oxide, conductive paints and conductive oxides. 6. An electric double layer capacitor of claim 5, wherein said conductive transition metal oxide is selected from ruthenium, osmium, iridium, indium and platinum. 7. An electric double layer capacitor of claim 1, wherein micro-pores are provided in said carbon fibers or activated carbon fibers such that among the micro-pores, the total of the inside surface areas of the micro-pores having an inner diameter of 20 .ANG. or larger occupies at least 1% of the total of the inside surface areas of all of the micro-pores. 8. An electric double layer capacitor of claim 1, wherein phenol-type carbon fibers are used. 9. An electric double layer capacitor of claim 1, wherein novolac-type activated carbon fibers are used made by carbonization and activating carbon fibers and phenol-type carbon fibers are used. 10. An electric double layer capacitor of claim 9, wherein carbonization and activation is made by using a metal salt or hydroxide of metal containing ions of lithium, sodium, potassium, magnesium, calcium or zinc as a catalyst. 11. An electric double layer capacitor of claim 1, wherein said polarizable electrode is in the form of a cloth, felt or sheet type material which consists of carbon fibers or activated carbon fibers. 12. An electric double layer capacitor of claim 1, wherein said conductive electrode is a metal layer formed by plasma spraying or arc spraying. 13. An electric double layer capacitor of claim 12, wherein said sprayed metal is selected from aluminum, nickel, copper, zinc, tin, lead, titanium and tantalum. 14. An electric double layer capacitor of claim 12, wherein weight of sprayed metal per unit area of said polarizable electrode surface is 0.05 mg/cm 2 -500 mg/cm 2 . 15. An electric double layer capacitor of claim 1, wherein said conductive electrode is made of a metal foil and it is bonded on said polarizable electrode with a conductive bond. 16. An electric double layer capacitor of claim 15, wherein the material of said metal foil is selected from aluminum, nickel, copper, zinc, tin, lead, titanium and tantalum. 17. An electric double layer capacitor of claim 1, wherein said conductive electrode is formed with a conductive paint. 18. An electric double layer capacitor of claim 1, wherein said electrolyte at least contains 1,2-dimethoxyethane. 19. An electric double layer capacitor of claim 1, wherein said element is enclosed in a pair of metal cases which form a pair with two pieces, and said conductive electrodes on said polarizable electrodes and said opposing electrodes are electrically contacted to said metal cases. 20. A multiunit capacitor element having an electric double layer formed at an interface between a polarizable electrode and an electrolyte, wherein said polarizable electrode consists of carbon fibers or activated carbon fibers with a conductive electrode formed on one face thereof, each unit capacitor element prepared by laminating said polarizable electrode such that margin parts are formed on both ends with a separator soaked with electrolyte inbetween, a plurality of said unit capacitor elements are laminated together and electrodes for outside leading out are formed on both ends of this laminated body. 21. A multiunit capacitor of claim 20, wherein each said unit capacitor element is constituted by disposing one polarizable electrode among polarizable electrodes opposite to said separator inbetween, in a manner that said conductive electrode on said polarizable electrode is situated on the side of said separator. 22. A multiunit capacitor of claim 20, wherein said outside leading out electrodes are constituted with metal layers made by plasma spraying or arc spraying.
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