EP0134706A2
Expired / Lapsed
EP
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Electric double layer capacitor and method for producing the same
Assignee: Panasonic Holdings Corp
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Filing: 1984-08-07
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Granted: —
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Expires: 2004-08-07
Abstract
Abstract An electric double layer capacitor having polarizable electrodes (106,107) including activated carbon fibers which are fully activated and have a large specific surface area, and a method for making the same. Each of the polarizable electrodes is composed of an activated carbon element having a surface fiber ratio (total geometric surface area of fabric/total geometric surface area of secondary fibers or strands) of 0.01 or more. Each activated carbon element is in the form of a woven fabric, nonwoven fabric, felt or the like including activated carbon fibers.
Inventors
- 👤 Akihiko Yoshida
- 👤 Atsushi Nishino
- 👤 Ichiro Tanahashi
- 👤 Yasuhiro Takeuchi
- 👤 Motoyoshi Ono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 09:01
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; D04H1/4242; D04H1/425; D04H1/4258; D04H1/4282; D04H1/43; H; H01; H01G; H01G11/00; H01G11/22; H01G11/30; H01G11/32; H01G11/34; H01G11/40; H01G11/84; H01G11/86; Y; Y02; Y02E; Y02E60/00; Y02E60/13
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
51 words
In an electric double layer capacitor including a pair of polarizable electrodes (106, 107), the improvement wherein each of said polarizable electrodes comprises an element including activated carbon fibers and having a surface fiber ratio (total geometric surface area of fabric/total geometric surface area of secondary fibers) of 0.01 or more.
Claim 2
Dependent Claim
51 words
In an electric double layer capacitor including a pair of polarizable electrodes (106, 107), the improvement wherein each of said polarizable electrodes comprises an element including activated carbon fibers and having a surface fiber ratio (total geometric surface area of fabric/total geometric surface area of secondary fibers) of 0.01 or more.
Claim 3
Dependent Claim
39 words
A capacitor according to claim 1, wherein said element including activated carbon fibers comprises a material selected from the group consisting of a woven fabric, nonwoven fabric and felt, each thereof composed of activated carbon fibers and conductive wires.
Claim 4
Dependent Claim
63 words
A capacitor according to claim 1, wherein said element including activated carbon fibers comprises a woven fabric made by weaving one of activated carbon fibers alone and a suitable combination of activated carbon fibers and conductive wires by a type of weaving selected from the group consisting of a plain weave, basket weave, satin weave, twill weave, three-dimensional weave and any combination thereof.
Claim 5
Dependent Claim
32 words
A capacitor according to claim 1, wherein said activated carbon fibers are made of a material selected from the group consisting of phenol type, rayon type, pitch type and PAN type fibers.
Claim 6
Independent Claim
62 words
A method of making an electric double layer capacitor including a pair of polarizable electrodes (106, 107), wherein each of said polarizable electrodes is made through a process of carbonizing and activating a woven fabric, nonwoven fabric, felt or the like having a surface fiber ratio (total geometric surface area of fabric/total geometric surface area of secondary fibers) of 0.01 or more.
Claim 7
Independent Claim
62 words
A method of making an electric double layer capacitor including a pair of polarizable electrodes (106, 107), wherein each of said polarizable electrodes is made through a process of carbonizing and activating a woven fabric, nonwoven fabric, felt or the like having a surface fiber ratio (total geometric surface area of fabric/total geometric surface area of secondary fibers) of 0.01 or more.
Claim 8
Dependent Claim
23 words
A method according to claim 5, wherein said secondary fibers are twisted primary fibers to have a diameter of 20 µm or less.
Claim 9
Dependent Claim
34 words
A method according to claim 5, wherein said woven fabric, nonwoven fabric, felt or the like has a weight (g/m 2 ) of from 20 g/m 2 to 100 0 g/ m 2 .
Claim 10
Dependent Claim
30 words
A method according to claim 5, wherein said fiber is made of a material selected from the group consisting of phenol type, rayon type, pitch type and PAN type fibers.
Claim 11
Dependent Claim
49 words
A method according to claim 5, wherein said woven fabric, nonwoven fabric, felt or the like has a weight (g/m 2 ) of from 0.002 A (g/m 2 ) to 0.2 A (g/m 2 ), where a desired capacitance is represented by A farads/m 2 of activated carbon element.
Claim 12
Dependent Claim
40 words
A method according to claim 5, wherein said woven fabric, nonwoven fabric, felt or the like comprises an element made of a suitable combination of conductive wires and one of phenol type, rayon type, pitch type and PAN type fibers.
Claim 13
Dependent Claim
30 words
ll. A method according to claim 10, wherein said conductive wires are made of a material having a melting point higher than a carbonization and activation temperature of said element.
Claim 14
Dependent Claim
28 words
A method according to claim 10, wherein said conductive wires are made of a material selected from the group consisting of tantalum, titanium, nichrome and an alloy thereof.
Claim 15
Dependent Claim
26 words
A method according to claim 5, wherein said carbonization and activation process is effected in an atmosphere (94, 103) including at least nitrogen and water vapor.
Claim 16
Dependent Claim
32 words
A method according to claim 5, wherein said carbonization and activation process is effected in an inert gas atmosphere (94, 103) by supplying thereto water vapor of 20 mm Hg or more.
Claim 17
Dependent Claim
32 words
A method according to claim 5, wherein said carbonization and activation process is effected in an inert gas atmosphere (94, 103) by supplying thereto water vapor of 100 mm Hg or more.
Claim 18
Dependent Claim
24 words
A method according to claim 5, wherein said carbonization and activation process is effected under the condition of a temperature of 800°C or more.
Claim 19
Dependent Claim
42 words
A method according to claim 13, wherein said water vapor supply is effected by liquid vaporizing means (100) basically comprising water (97), absorbing means (98) disposed to contact with said water (97), and heating means (99) disposed on said absorbing means (98).
Claim 20
Dependent Claim
27 words
A method according to claim 5, wherein said element comprising a woven fabric, nonwoven fabric, felt or the like is impregnated with water prior to the activation.
Claim 21
Dependent Claim
22 words
A method according to claim 18, wherein said water contains ions of at least one of alkaline metal and alkaline earth metal.
References Cited (Backward Citations)
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