Electric double layer capacitor and method for producing the same
First Claim
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1. An electric double layer capacitor comprising:
- a pair of polarizable electrodes having electrically-conductive substrates coated with layers made of a mixture of activated carbon and at least one of polysaccharides and their derivatives which acts as a binding agent,a separator interposed between said polarizable electrodes which are facing one other, andan electrolyte.
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Abstract
An electric double layer capacitor which has a pair of polarizable electrodes, composed of electrically-conductive substrates. The substrates are coated in layers of a mixture of activated carbon with a water-soluble material-based binding agent, optionally including an agent for improving electric conductivity. The electrodes face each other interposed by a separator, and are impregnated with an electrolyte. The capacitor has the advantageous features of both conventional capacitors using an aqueous electrolyte and those capacitors using an organic solvent electrolyte; in other words, the capacitor can withstand high voltages while holding a low internal resistance.
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18 Claims
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1. An electric double layer capacitor comprising:
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a pair of polarizable electrodes having electrically-conductive substrates coated with layers made of a mixture of activated carbon and at least one of polysaccharides and their derivatives which acts as a binding agent, a separator interposed between said polarizable electrodes which are facing one other, and an electrolyte. - View Dependent Claims (2, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18)
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3. A method for producing an electric double layer capacitor comprising the steps of:
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depositing a mixture on aluminum substrates by means of one of painting, impregnating, printing spin coating, and doctor-blade coating, said deposited mixture prepared by dispersing activated carbon in one of an aqueous solution of at least one of the group consisting of methyl cellulose, cellulose each having (a) carboxyl group(s), their derivatives, hydroxyethyl cellulose, hydroxypropyl cellulose and their derivatives, and a solution prepared by dissolving polysaccharides in one of water and an aqueous acid; drying the aluminum substrates with the deposited mixture; and interposing separators between the dried aluminum substrates with the deposited mixture, said dried aluminum substrates facing each other. - View Dependent Claims (4, 5)
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6. An electric double layer capacitor comprising:
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a pair of polarizable electrodes having electrically-conductive substrates each being coated with layers made of a mixture of activated carbon and at least one binding agent selected from the group consisting of methyl cellulose, cellulose each having (a) carboxyl group(s), their derivatives, hydroxyethyl cellulose, hydroxypropyl cellulose and their derivatives; a separator interposed between said polarizable electrodes, said polarizable electrodes facing each other; and an electrolyte. - View Dependent Claims (13, 17)
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Specification