Fibril composite electrode for electrochemical capacitors
First Claim
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1. A composition for use in an electrode for electrochemical capacitors, comprising:
- a) an electrochemically active material; and
b) carbon nanofibers having a surface area greater than about 100 m2/gm.
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Abstract
Composite electrodes including carbon nanofibers (fibrils) and an electrochemically active material are provided for use in electrochemical capacitors. The fibril composite electrodes exhibit high conductivity, improved efficiency of active materials, high stability, easy processing, and increase the performance of the capacitor. A method for producing the composite electrodes for use in electrochemical capacitors is also provided.
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Citations
32 Claims
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1. A composition for use in an electrode for electrochemical capacitors, comprising:
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a) an electrochemically active material; and
b) carbon nanofibers having a surface area greater than about 100 m2/gm. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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2. A composition for use in an electrode for electrochemical capacitors comprising:
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a) an electrochemically active material; and
b) carbon nanofibers having a surface area greater than about 100 m2/gm which exhibit electrical capacitance and serve to consolidate the electrode.
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17. A composition for use in an electrode for electrochemical capacitors comprising:
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a) an electrochemically active material selected from the group consisting of activated carbon, carbon aerogels, carbon foams derived from polymers, oxides, hydrous oxides, carbides, nitrides, and conducting polymers; and
b) carbon nanofibers having a surface area greater than about 100 m2/gm, which exhibit electrical capacitance and which serve to consolidate the electrode, said nanofibers being substantially cylindrical and of a substantially constant diameter, having graphitic layers concentric with the nanofiber axis and being substantially free of pyrolytically deposited carbon.
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18. A composite electrode for electrochemical capacitors, comprising:
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a) an electrochemically active material; and
b) nanofibers having a surface area greater than about 100 m2/gm. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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19. A composite electrode for electrochemical capacitors, comprising:
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a) an electrochemically active material; and
b) nanofibers having a surface area greater than about 100 m2/gm which exhibit electrical capacitance and which serve to consolidate the electrode.
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26. An electrochemical capacitor comprising a composite electrode, said composite electrode comprising an electrochemically active material and nanofibers having a surface area greater than about 100 m2/gm which exhibit electrical capacitance and which serve to consolidate the electrode.
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27. An electrochemical capacitor, comprising:
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a) first and second composite electrodes, each comprising an electrochemically active material and carbon nanofibers having a surface area greater than about 100 m2/gm which exhibit electrical capacitance and which serve to consolidate the electrode; and
b) an electrode separator disposed between said first and second electrodes, the electrode separator comprising an electrically nonconductive and ionically conductive material. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification