ELECTRICAL STORAGE DEVICE AND ELECTRODE THEREOF

• US 20120244429A1
• Filed: 08/27/2010
• Published: 09/27/2012
• Est. Priority Date: 08/27/2009
• Status: Active Grant

• Current Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education)
• Original Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education)
• Inventors: Lam, Lan Trieu, Louey, Rosalle, Vella, David
• Granted Patent: US 9,401,508 B2
• Time in Patent Office: Days
• US Class Current: 429/211
• CPC Class Codes: H01G 11/04 Hybrid capacitors
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• CPC Class Codes: H01G 11/30 characterised by their material
• CPC Class Codes: H01G 11/40 Fibres
• CPC Class Codes: H01G 11/46 Metal oxides
• CPC Class Codes: H01G 11/86 specially adapted for electrodes carbonisation or activation of carbon for the manufacture of electrodes H01G11/34
• CPC Class Codes: H01M 10/06 Lead-acid accumulators semi-lead accumulators H01M10/20
• CPC Class Codes: H01M 2300/0011 Sulfuric acid-based
• CPC Class Codes: H01M 4/14 Electrodes for lead-acid accumulators
• CPC Class Codes: H01M 4/20 of pasted electrodes
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/48 of inorganic oxides or hydroxides
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 4/663 containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
• CPC Class Codes: H01M 4/73 for lead-acid accumulators, e.g. frame plates
• CPC Class Codes: H01M 4/74 Meshes or woven material; Expanded metal
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49115 : including coating or impregnating

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.

Claims

1. An electrode for an electrical storage device comprising:

a current collector;

a first electroactive material;

a second electroactive material; and

an electrically conductive mat;

wherein;

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.

2. The electrode according to claim 1, wherein the electrically conductive mat comprises a porous network of interconnected electrically conductive fibres.

3. The electrode according to claim 2, wherein the electrically conductive mat is a carbon fibre sheet.

4. The electrode according to claim 1, wherein the electrically conductive mat comprises one or more coatings, layers or regions comprising at least one of the first electroactive material and second electroactive material.

5. The electrode according to claim 1, wherein the electrically conductive mat comprises one or more coatings, layers or regions consisting of the first electroactive material or second electroactive material, optionally with one or more additives.

6. The electrode according to claim 1, wherein the electrically conductive mat is provided as an intervening layer separating the first electroactive material from the second electroactive material.

7. The electrode according to claim 1, wherein the first electroactive material is a lead based material.

8. The electrode according to claim 1, wherein the second electroactive material is selected from one or more of the group consisting of high-surface area carbon, ruthenium oxide, silver oxide, cobalt oxide and conducting polymers.

9. The electrode according to claim 8, wherein the high surface area carbon is one or more materials selected from the group consisting of activated carbon, carbon black, amorphous carbon, carbon nanoparticles, carbon nanotubes and carbon fibres.

10. The electrode according to claim 9, wherein the high surface area carbon is activated carbon.

11. An electrical storage device comprising at least one pair of negative and positive electrodes, wherein at least one electrode is an electrode according to claim 1.

12. The electrical storage device according to claim 11, wherein the at least one electrode is a negative electrode comprising a first electroactive material selected from one or more of the group consisting of cadmium, metal hydrides, lead and zinc.

13. The electrical storage device according to claim 12, wherein the first electroactive material is lead.

14. The electrical storage device according to claim 11, wherein the at least one electrode is a positive electrode comprising a first electroactive material selected from one or more of the group consisting of nickel oxide, lead oxide and silver.

15. The electrical storage device according to claim 14, wherein the first electroactive material is lead oxide.

16. The electrical storage device according to claim 11, wherein the device is a valve regulated device.

17. The electrical storage device according to claim 11, wherein the electrical storage device is configured for operation under a compression force of less than about 80 kPa.

19. A process for fabricating an electrode according to claim 1, the process comprising:

forming a composite layer comprising at least one of the first electroactive material and the second electroactive material deposited on and/or incorporated within the electrically conductive mat; and

coupling the composite layer to the current collector.

20. A process for fabricating an electrode according to claim 19, wherein the process further comprises forming a coating of the first electroactive material on the current collector, and coupling the composite layer to the coating of the first electroactive material on the current collector.

18. 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:

a current collector;

a first layer deposited on the current collector, the first layer comprising sponge lead;

a second layer in contact with the first layer, the second layer comprising an electrically conductive mat comprising a network of interconnected electrically conductive carbon fibres;

a third layer deposited on 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.