Metal oxide electrode for supercapacitor and manufacturing method thereof

• US 6,339,528 B1
• Filed: 02/28/2000
• Issued: 01/15/2002
• Est. Priority Date: 09/16/1999
• Status: Expired due to Term

• Current Assignee: Nesscap Company Limited (Tesla Inc.)
• Original Assignee: Ness Capacitor Co., Ltd.
• Inventors: Seong, Woo-Kyeong, Lee, Hee-Young, Kim, Heui-Soo, Kim, Sun-Wook
• Primary Examiner(s): Dinkins, Anthony
• Assistant Examiner(s): Thomas, Eric W.
• Application Number:
  US09/514,366
• Time in Patent Office: 687 Days
• Field of Search: 361/502-504, 428/408, 428/469, 428/702
• US Class Current: 361/502
• CPC Class Codes: H01G 11/04 Hybrid capacitors
• CPC Class Codes: H01G 11/46 Metal oxides
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A metal oxide electrode for a supercapacitor and a manufacturing method thereof are disclosed. Potassium permanganate is absorbed on a conductive material, such as carbon or activated carbon, and mixed with a solution including manganese acetate so as to form amorphous manganese oxide. Amorphous manganese oxide powder is grounded to a powder which is mixed with binder to form an electrode having a predetermined shape. The electrode reduces equivalent serial resistance and enhances high frequency characteristics since the contact area and the adhesion strength between the manganese oxide and the conductive carbon are improved. Also, the electrode has high capacitance suitable for a supercapacitor, which is manufactured therefrom at a greatly reduced cost.

Claims

1. A metal oxide electrode for a supercapacitor comprising:

a manganese oxide powder including potassium (K) ions;

a conductive material; and

a binder for binding said manganese oxide powder to said conductive material.

2. The metal oxide electrode for a supercapacitor as claimed in claim 1, wherein said conductive material is composed of a material selected from the group consisting of a metal oxide, a metal nitride, a metal carbide, a metal powder and a conducting polymer and said manganese oxide powder is coated on said conductive material.

3. The metal oxide electrode for a supercapacitor as claimed in claim 1, wherein said conductive material is a conductive carbon and said manganese oxide powder is coated on said conductive carbon.

4. The metal oxide electrode for a supercapacitor as claimed in claim 3, wherein said electrode comprises about 20 to about 80% by weight of said conductive carbon.

5. The metal oxide electrode for a supercapacitor as claimed in claim 1, wherein said conductive material is an activated carbon and said manganese oxide powder is coated in pores of said activated carbon and on a surface of said activated carbon.

6. The metal oxide electrode for a supercapacitor as claimed in claim 5, wherein said electrode comprises about 20 to about 80% by weight of said activated carbon.

7. The metal oxide electrode for a supercapacitor as claimed in claim 5, wherein said activated carbon has a specific surface area of about 1500 to 3000 m²/g.

8. The metal oxide electrode for a supercapacitor as claimed in claim 1, wherein said conductive material is composed of a material selected from the group consisting of a metal oxide, a metal nitride, a metal carbide, a metal powder and a conducting polymer and said manganese oxide powder has a layer structure.

9. The metal oxide electrode for a supercapacitor as claimed in claim 1, wherein said conductive material is a conductive carbon and said manganese oxide powder has a layer structure.

10. The metal oxide electrode for a supercapacitor as claimed in claim 9, wherein said electrode comprises about 30 to about 90% by weight of said manganese oxide powder, about 5 to about 20% by weight of said conductive carbon and about 5 to 50% by weight of said binder.

11. The metal oxide electrode for a supercapacitor as claimed in claim 1, wherein said binder is composed of a polytetrafluoroethylene.

12. A metal oxide electrode for a supercapacitor comprising:

a conductive carbon;

an amorphous manganese oxide powder coated on said conductive carbon, wherein said manganese oxide powder is formed by mixing a first solution having a potassium permanganate absorbed on said conductive carbon after said conductive carbon is dispersed in the first solution with a second solution of a manganese acetate; and

a binder for binding said manganese oxide powder to said conductive carbon.

13. The metal oxide electrode for a supercapacitor as claimed in claim 12, wherein said electrode comprises about 20 to about 80% by weight of said conductive carbon.

14. A metal oxide electrode for a supercapacitor comprising:

an activated carbon;

an amorphous manganese oxide powder coated in pores of said activated carbon and on a surface of said activated carbon, wherein said manganese oxide powder is formed by mixing a first solution having a potassium permanganate absorbed in the pores of said activated carbon and on the surface of said activated carbon after said activated carbon is dispersed in the first solution with a second solution of a manganese acetate; and

a binder for binding said manganese oxide powder to said activated carbon.

15. The metal oxide electrode for a supercapacitor as claimed in claim 14, wherein said electrode comprises about 20 to about 80% by weight of said activated carbon.

16. The metal oxide electrode for a supercapacitor as claimed in claim 14, wherein said activated carbon has a specific area of about 1500 to about 3000 m²/g.