Electrical storage device and electrode thereof
First Claim
1. An electrode for an electrical storage device comprising:
- a current collector in the form of a current collector grid or plate;
a first electroactive material in a form of a first electroactive material layer;
a second electroactive material in a form of a second electroactive material layer; and
an electrically conductive mat comprising a porous network of interconnected electrically conductive fibres, forming an electrically conductive mat layer;
wherein;
the first electroactive material is deposited upon a planar side of the current collector grid or plate, the electrically conductive mat is layered upon the first electroactive material, and the second electroactive material is layered upon the electrically conductive mat;
the first electroactive material has a higher energy density than the second electroactive material, and the second electroactive material has a higher rate capability than the first electroactive material; and
the electrically conductive mat provides structural and conductive support for at least one of the first electroactive material and the second electroactive material.
1 Assignment
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Accused Products
Abstract
The present invention generally relates to electrodes, electrical storage devices comprising the electrodes, and methods for producing the electrodes and electrical storage devices. The electrodes comprise a current collector, an electrically conductive mat, and a first and second electroactive material, the first electroactive material having a higher energy density than the second electroactive material, and the second electroactive material having a higher rate capability than the first electroactive material. The electrically conductive mat provides a structural and conductive support for at least one of the high-rate and high-energy electroactive materials. The electrodes can be provided in various configurations and be used in high-rate high-energy electrical storage devices to provide improved cycle life.
193 Citations
19 Claims
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1. An electrode for an electrical storage device comprising:
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a current collector in the form of a current collector grid or plate; a first electroactive material in a form of a first electroactive material layer; a second electroactive material in a form of a second electroactive material layer; and an electrically conductive mat comprising a porous network of interconnected electrically conductive fibres, forming an electrically conductive mat layer; wherein; the first electroactive material is deposited upon a planar side of the current collector grid or plate, the electrically conductive mat is layered upon the first electroactive material, and the second electroactive material is layered upon the electrically conductive mat; the first electroactive material has a higher energy density than the second electroactive material, and the second electroactive material has a higher rate capability than the first electroactive material; and the electrically conductive mat provides structural and conductive support for at least one of the first electroactive material and the second electroactive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19)
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15. An electrical storage device comprising at least one lead dioxide based positive electrode and at least one sponge lead based negative electrode in a sulphuric acid electrolyte solution, wherein the at least one sponge lead based negative electrode comprises:
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a current collector in the form of a current collector grid or plate; a first layer deposited on a planar side of the current collector grid or plate, the first layer comprising sponge lead; a second layer layered upon the first layer, the second layer comprising an electrically conductive mat comprising a network of interconnected electrically conductive carbon fibres; a third layer layered upon the second layer, the third layer comprising a second electroactive material; wherein the sponge lead has a higher energy density than the second electroactive material, and the second electroactive material has a higher rate capability than the sponge lead.
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Specification