Electrode and current collector for electrochemical capacitor having double electric layer and double electric layer electrochemical capacitor formed therewith
First Claim
1. An electrode for use in an electrochemical capacitor, said electrode consisting essentially of:
- an active material comprising an activated carbon obtained from the carbonization and subsequent activation of a furane tar and/or a furane resin; and
a binder consisting of a fluorine-containing polymer;
wherein said binder is present in said electrode in an amount of between about 0.5 and about 5.0 weight percent.
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Accused Products
Abstract
An electrode and a DEL capacitor formed therewith. The electrode will typically be a polarizable electrode comprised of an activated carbon material having a substantially zero ash percentage and a low percentage of transition metals. In constructing a DEL capacitor employing the electrode of the present invention, a non-polarizable electrode consisting of a lead dioxide/lead sulfate compound is preferably also used. The DEL capacitor may utilize an acid-based electrolyte, such as an aqueous sulfuric acid electrolyte. Consequently, the present invention also includes a current collector that preferably comprises a base material consisting of lead or a lead compound and a protective coating material that is resistant to an acid-based electrolyte. Preferably, the protective coating material is formed from a polymer base and a conductive dope that may thereafter be applied to the current collector base material by a variety of methods.
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Citations
32 Claims
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1. An electrode for use in an electrochemical capacitor, said electrode consisting essentially of:
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an active material comprising an activated carbon obtained from the carbonization and subsequent activation of a furane tar and/or a furane resin; and
a binder consisting of a fluorine-containing polymer;
wherein said binder is present in said electrode in an amount of between about 0.5 and about 5.0 weight percent. - View Dependent Claims (2, 3, 4)
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5. An electrode assembly for use in an electrochemical capacitor, comprising:
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at least one electrode consisting essentially of a composite mixture having an active material comprising an activated carbon obtained from the carbonization and subsequent activation of a furane tar and/or a furane resin, and a fluorine-containing polymer binder; and
a current collector, said current collector further comprising;
a substrate formed from an electrically conductive material, and a protective coating encasing at least a portion of said substrate that will be exposed to an electrolyte once said current collector is installed to said electrochemical capacitor, said protective coating consisting essentially of a composite having a polymer base material and a conductive dope, wherein said at least one electrode is affixed to said substrate after said substrate is covered with said protective coating; and
wherein said protective coating is resistant to an acid-based electrolyte. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A double electric layer electrochemical capacitor, comprising:
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at least one polarizable electrode assembly, said polarizable electrode assembly further comprising;
(a) at least one electrode comprising a composite mixture having an active material consisting essentially of an activated carbon obtained from the carbonization and subsequent activation of a furane tar and/or a furane resin, and a fluorine-containing polymer binder; and
(b) a current collector, said current collector further comprising;
a substrate formed from an electrically conductive material, and a protective coating encasing at least a portion of said substrate that will be exposed to an electrolyte once said current collector is installed to said electrochemical capacitor, said protective coating consisting essentially of a composite having a polymer base material and a conductive dope that is resistant to an acid-based electrolyte, at least one non-polarizable electrode assembly, said non-polarizable electrode assembly further comprising;
(a) at least one non-polarizable electrode consisting essentially of a composite mixture of a metal dioxide and a metal sulfate; and
(b) a current collector, said current collector further comprising;
a substrate formed from an electrically conductive material, and a protective coating encasing at least a portion of said substrate that will be exposed to an electrolyte once said current collector is installed to said electrochemical capacitor, said protective coating consisting essentially of a composite having a polymer base material and a conductive dope that is resistant to an acid-based electrolyte, an enclosure for housing both said at least one polarizable electrode assembly and said at least one non-polarizable electrode assembly;
at least one separator within said enclosure for separating said at least one polarizable electrode assembly from said at least one non-polarizable electrode assembly; and
an acid-based electrolyte residing within said enclosure and between said at least one polarizable electrode assembly and said at least one non-polarizable electrode assembly;
wherein charge storage is accomplished at said at least one polarizable electrode assembly by means of a non-Faradaic, double layer electrochemical mechanism that occurs at an interface of said polarizable electrode and said electrolyte; and
wherein said charge storage is accomplished at said at least one non-polarizable electrode assembly by means of oxidation/reduction reactions that occur at an interface between said non-polarizable electrode and said electrolyte. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A double electric layer electrochemical capacitor, comprising:
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a plurality of polarizable electrode assemblies, each of said polarizable electrode assemblies comprising;
(a) at least one electrode consisting essentially of a composite mixture having an active material comprising an activated carbon obtained from the carbonization and subsequent activation of a furane tar and/or a furane resin, and a fluorine-containing polymer binder; and
(b) a current collector, said current collector further comprising;
a substrate formed from an electrically conductive material, and a protective coating encasing at least a portion of said substrate that will be exposed to an electrolyte once said current collector is installed to said electrochemical capacitor, said protective coating consisting essentially of a composite having a polymer base material and a conductive dope that is resistant to an acid-based electrolyte, an enclosure for housing both said plurality of polarizable electrode assemblies;
at least one separator within said enclosure for separating said plurality of polarizable electrode assemblies; and
an acid-based electrolyte residing within said enclosure and between said plurality of polarizable electrode assemblies;
wherein charge storage is accomplished at each of said plurality of polarizable electrode assemblies by means of a non-Faradaic, double layer electrochemical mechanism that occurs at an interface of said polarizable electrode and said electrolyte.
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Specification