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 an electrode with a carbon-based active mass and a sulfuric acid electrolyte, comprising:
- a current collector basis made from a conductive carbon-based active material of p-type conductivity that exhibits electrophysical parameters that are similar to the electrophysical parameters of the active mass of the electrode; and
a protective film encapsulating at least a portion of said current collector basis and filling the pores thereof, the protective film having a p-type conductivity and comprising a conductive composite material made from a conductive carbon powder and an organic polymer;
wherein, due to said similar electrophysical parameters, a homojunction occurs in the area of contact between the active mass of the electrode and said current collector.
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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
21 Claims
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1. A current collector for use in an electric double layer electrochemical capacitor having an electrode with a carbon-based active mass and 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 that exhibits electrophysical parameters that are similar to the electrophysical parameters of the active mass of the electrode; and a protective film encapsulating at least a portion of said current collector basis and filling the pores thereof, the protective film having a p-type conductivity and comprising a conductive composite material made from a conductive carbon powder and an organic polymer; wherein, due to said similar electrophysical parameters, a homojunction occurs in the area of contact between the active mass of the electrode and said current collector. - 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 an electrode with a carbon-based active mass and a sulfuric acid electrolyte, comprising:
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a current collector basis made from a graphite foil having p-type conductivity and exhibiting electrophysical parameters that are similar to the electrophysical parameters of the active mass of the electrode; a protective film encapsulating and filling the pores of said graphite foil basis except a lug and a terminal portion thereof, wherein said protective film has p-type conductivity and comprises a conductive composite material made from a conducting carbon powder and an organic polymer; and an organic polymer material providing high ionic resistance to prevent the transfer of electrolyte ions to the volume of said current collector during charging and discharge of said capacitor covering a lug portion of said current collector basis; wherein, due to said similar electrophysical parameters, a homojunction occurs in the area of contact between the active mass of the electrode and said current collector. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification