NEGATIVE ELECTRODE CURRENT COLLECTOR FOR HETEROGENEOUS ELECTROCHEMICAL CAPACITOR AND METHOD OF MANUFACTURE THEREOF
First Claim
1. A current collector for use in an electric double layer electrochemical capacitor having a sulfuric acid electrolyte, comprising:
- a current collector basis made from a conductive carbon-based active material of p-type conductivity; and
a protective film covering at least a portion of said current collector basis and filling the pores thereof, said protective film further comprising a conductive composite material made from a conducting carbon powder and an organic polymer with p-type conductivity.
1 Assignment
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Accused Products
Abstract
A current collector for use in an electric double layer electrochemical capacitor having a sulfuric acid electrolyte. The current collector uses a conducting carbon (e.g., graphite foil) basis with p-type conductivity. A protective film covers at least a portion of the graphite foil basis. The protective film is comprised of a conducting composite material made with a conducting carbon and a conducting organic polymer with p-type conductivity. The protective film is grown on the current collector basis such that it preferably fills the pores of the current collector basis. A lug portion of the current collector basis may be protected with an insulating polymer material.
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Citations
25 Claims
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1. A current collector for use in an electric double layer electrochemical capacitor having a sulfuric acid electrolyte, comprising:
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a current collector basis made from a conductive carbon-based active material of p-type conductivity; and a protective film covering at least a portion of said current collector basis and filling the pores thereof, said protective film further comprising a conductive composite material made from a conducting carbon powder and an organic polymer with p-type conductivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A current collector for use in an electric double layer electrochemical capacitor having a sulfuric acid electrolyte, comprising:
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a current collector basis made from a graphite foil having p-type conductivity; a protective film covering and filling the pores of all but a lug and terminal portion of said graphite foil basis, said protective film further comprising a conductive composite material made from a conducting carbon powder and an organic polymer that both have p-type conductivity; and an organic insulating polymer material covering a lug portion of said current collector basis, said insulating polymer material having p-type conductivity. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method of manufacturing a current collector for use in an electric double layer electrochemical capacitor having a sulfuric acid electrolyte, comprising:
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cutting a current collector basis from a graphite foil having p-type conductivity; preparing a conductive composite paste based on a conducting carbon powder and a conducting organic polymer that both have p-type conductivity placing an amount of said paste in a bath; submerging at least a portion of said graphite foil basis in said conductive composite paste and subsequently sealing said bath for some period of time; slowly reducing the level of said conductive composite paste in said bath so that a protective film of substantially uniform thickness grows over a contacted portion of said graphite foil basis; removing said current collector from said bath; air drying said current collector for some predetermined period of time; and after air drying, subjecting said current collector to thermal treatment at an elevated temperature for some period of time. - View Dependent Claims (23, 24, 25)
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Specification