Polarizable electrode
First Claim
1. In a polarizable electrode in an electrolyte comprising a highly conductive electrical conductor, which is covered by an electrically conductive plastic sheath cover, the improvement wherein said sheath cover comprises at least two different layers including an inner predominantly nonpolar electrically conductive polymer layer directly adjacent said electrical conductor and an outer predominantly polar electrically conductive polyer, layer, said inner layer being composed of an electrically conductive plastic having a high stability to said electrolyte, said outer layer being in contact with said electrolyte and being composed of a different electrically conductive plastic fashioned to undergo a structural change by action of said electrolyte in the form of an increase in porosity, volume and surface area, and said inner and outer layers each to a thickness of from 0.2 to 5 mm circumferentially completely surrounding said conductor.
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Abstract
The polarizable electrode in an electrolyte comprises an electrically conductive conductor, advantageously metal or carbon, which is surrounded by an inner layer made of an electrically conductive plastic, which has a high stability to action by the electrolyte and does not lose its closed structure on insertion of the electrode so that protection of the electrically highly conductive conductor against electrochemical or chemical action is guaranteed. The inner layer is enclosed by an outer layer made of electrically conductive plastic, which loses its closed structure by the electrochemical processes occurring and which expands to a large volume so that the active working surface of the electrode is increased by the desired porosity.
24 Citations
13 Claims
- 1. In a polarizable electrode in an electrolyte comprising a highly conductive electrical conductor, which is covered by an electrically conductive plastic sheath cover, the improvement wherein said sheath cover comprises at least two different layers including an inner predominantly nonpolar electrically conductive polymer layer directly adjacent said electrical conductor and an outer predominantly polar electrically conductive polyer, layer, said inner layer being composed of an electrically conductive plastic having a high stability to said electrolyte, said outer layer being in contact with said electrolyte and being composed of a different electrically conductive plastic fashioned to undergo a structural change by action of said electrolyte in the form of an increase in porosity, volume and surface area, and said inner and outer layers each to a thickness of from 0.2 to 5 mm circumferentially completely surrounding said conductor.
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13. A polarizable electrode in an electrolyte comprising:
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a highly conductive conductor comprising a metal or carbon fibers; and an inner predominantly nonpolar layer immediately adjacent said conductor and an outer predominantly polar layer adjacent said electrolyte each of which to a thickness of from 0.2 to 5 mm completely circumferentially encloses said highly conductive conductor, said inner layer at least partially comprising polyethylene, polypropylene or a mixture of said polyethylene and said polypropylene and said outer layer at least partially comprising ethylene vinyl acetate, hard or soft polyvinyl chloride, acrylonitrile-butadiene-styrene terpolymer, chlorinated polyethylene, polyurethane, nitrile rubber, styrene-butadiene rubber, halogen elastomer or a mixture thereof, both said inner and said outer layer also containing between 5 and 70 Vol. % of carbon black, graphite powder, carbon fiber, graphite fiber or a mixture thereof.
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Specification