Electrode and electrical storage device for lead-acid system

Patent metadata

Field	Value
Publication number	US-9812703-B2
Application number	US-201113996934-A
Country	US
Kind code	B2
Filing date	Dec 21, 2011
Priority date	Dec 21, 2010
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

The present invention generally relates to electrodes for use in lead-acid battery systems, batteries and electrical storage devices thereof, and methods for producing the electrodes, batteries and electrical storage devices. In particular, the electrodes comprise active battery material for a lead-acid storage battery, wherein the surface of the electrode is provided with a coating layer comprising a carbon mixture containing composite carbon particles, wherein each of the composite carbon particles comprises a particle of a first capacitor carbon material combined with particles of a second electrically conductive carbon material. The electrical storage devices and batteries comprising the electrodes are, for example, particularly suitable for use in hybrid electric vehicles requiring a repeated rapid charge/discharge operation in the PSOC, idling-stop system vehicles, and in industrial applications such as wind power generation, and photovoltaic power generation.

First claim

The invention claimed is:

1. An electrode comprising active battery material for a lead-acid storage battery, wherein a surface of the electrode is provided with a coating layer comprising a carbon mixture containing composite carbon particles, wherein each of the composite carbon particles comprises a particle of a first capacitor carbon material with particles of a second electrically conductive carbon material adhered to a surface of the first capacitor carbon material, and wherein a surface coverage on the particles of the first capacitor carbon material by the second electrically conductive carbon material is at least 20%.

2. The electrode according to claim 1 , wherein the surface coverage on the particles of the first capacitor carbon material by the second electrically conductive carbon material is at least 50%.

3. The electrode according to claim 1 , wherein a particle size of the second electrically conductive carbon material is one-fifth or less of that of the first capacitor carbon material.

4. The electrode according to claim 1 , wherein the ratio by weight % of the first capacitor carbon material to the second electrically conductive carbon material is between 15:1 to 10:8.

5. The electrode according to claim 1 , wherein the first capacitor carbon material is a high specific surface area carbonaceous material that has a specific surface area of at least 500 m 2 /g measured by adsorption using BET isotherm.

6. The electrode according to claim 1 , wherein the first capacitor carbon material is activated carbon.

7. The electrode according to claim 1 , wherein the second electrically conductive carbon material is selected from at least one of carbon black, graphite, glassy carbon, and a nanocarbon fiber.

8. The electrode according to claim 1 , wherein the coating layer of the carbon mixture comprises 4 to 100 parts by weight of the second electrically conductive carbon material relative to 100 parts by weight of the first capacitor carbon material.

9. The electrode according to claim 1 , wherein an amount of the carbon mixture for the coating layer of the electrode is 1 to 15% by weight relative to a weight of the active battery material on the electrode.

10. The electrode according to claim 1 , wherein the electrode is a negative electrode comprising negative active battery material for a lead-acid storage battery.

11. The electrode according to claim 1 , wherein the composite carbon particles are produced by at least one of grinding, granulating and unifying, the particles of the first capacitor carbon material with the particles of the second electrically conductive carbon material.

12. The electrode according to claim 1 , wherein the composite carbon particles are produced by bead or ball milling.

13. An electrical storage device for a lead acid based system comprising the electrode according to claim 1 .

14. The electrical storage device of claim 13 , wherein the device is a lead-acid storage battery.

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 negative electrode comprises:
a current collector;
a first layer deposited on the current collector, the first layer comprising active battery material of sponge lead;
a second layer in contact with at least a portion of the first layer, the second layer comprising composite carbon particles, wherein each of the composite carbon particles comprises a particle of a first capacitor carbon material with particles of a second electrically conductive carbon material adhered to a surface of the first capacitor carbon material, and wherein a surface coverage on the particles of the first capacitor carbon material by the second electrically conductive carbon material is at least 20%.

16. A method for preparing an electrode comprising active battery material for a lead-acid storage battery, wherein the method comprises:
preparing composite carbon particles by at least one of grinding, granulating and unifying, particles of a first capacitor carbon material with particles of a second electrically conductive carbon material having a particle size less than that of the first capacitor carbon material, whereby each composite carbon particle comprises a particle of the first capacitor carbon material with particles of the second electrically conductive carbon material adhered to a surface of the first capacitor carbon material such that a surface coverage on the particles of the first capacitor carbon material by the second electrically conductive carbon materials is at least 20%;
preparing a carbon mixture comprising the composite carbon particles; and
providing the carbon mixture as a coating on at least a portion of the surface of an electrode comprising active battery material for a lead-acid storage battery.

17. An electrode comprising active battery material for a lead-acid storage battery, wherein the surface of the electrode is provided with a coating layer comprising a carbon mixture containing composite carbon particles, wherein each of the composite carbon particles comprises a particle of a first capacitor carbon material with particles of a second electrically conductive carbon material adhered to a surface of the first capacitor carbon material, wherein a surface coverage on the particles of the first capacitor carbon material by the second electrically conductive carbon material is at least 20%, and wherein the carbon mixture further comprises a third electrically conductive carbon material.

18. The electrode according to claim 17 , wherein the third electrically conductive carbon material is selected from at least one of carbon black, graphite, glassy carbon, and a nanocarbon fiber.

19. The electrode according to claim 17 , wherein the surface coverage on the particles of the first capacitor carbon material by the second electrically conductive carbon material is at least 50%.

20. The electrode according to claim 17 , wherein a particle size of the second electrically conductive carbon material is one-fifth or less of that of the first capacitor carbon material.

21. The electrode according to claim 17 , wherein the ratio by weight % of the first capacitor carbon material to the second electrically conductive carbon material is between 15:1 to 10:8.

22. The electrode according to claim 17 , wherein the first capacitor carbon material is a high specific surface area carbonaceous material that has a specific surface area of at least 500 m 2 /g measured by adsorption using BET isotherm.

23. The electrode according to claim 17 , wherein the first capacitor carbon material is activated carbon.

24. The electrode according to claim 17 , wherein the second electrically conductive carbon material is selected from at least one of carbon black, graphite, glassy carbon, and a nanocarbon fiber.

25. The electrode according to claim 17 , wherein the coating layer of the carbon mixture comprises 4 to 100 parts by weight of the second electrically conductive carbon material relative to 100 parts by weight of the first capacitor carbon material.

26. The electrode according to claim 25 , wherein the coating layer of the carbon mixture further comprises 50 parts by weight or less of the third electrically conductive carbon material relative to 100 parts by weight of the first capacitor carbon material.

Assignees

• Furukawa Jun
• Monma Daisuke
• Lam Lan Trieu
• Louey Rosalie
• Haigh Nigel Peter
• Commw Scient Ind Res Org
• Furukawa Battery Co Ltd

Inventors

• Furukawa Jun
• Monma Daisuke
• Lam Lan Trieu
• Louey Rosalie
• Haigh Nigel Peter

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/16

  Processes of manufacture · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/14 Primary

  Electrodes for lead-acid accumulators · CPC title