Method of making composite electrode materials for high energy and high power density energy storage devices

• US 5,797,971 A
• Filed: 09/24/1996
• Issued: 08/25/1998
• Est. Priority Date: 12/09/1994
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Zheng, Jian-Ping, Jow, T. Richard
• Primary Examiner(s): Niebling, John
• Assistant Examiner(s): BILODEAU, THOMA
• Application Number:
  US08/718,883
• Time in Patent Office: 700 Days
• Field of Search: 29/25.03, 361/503, 361/504, 361/505, 361/516, 361/518, 361/562
• US Class Current: 29/25.03
• 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: H01G 9/042 characterised by the material H01G11/22 takes precedence
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

This invention relates to a composite electrode material for use in high rgy and high power density electrochemical capacitors, and to the electrochemical capacitor containing the electrodes. The electrodes are comprised of materials with high specific capacitance and electronic conductivity/high porosity. Specifically, the electrode is comprised of RuO₂.xH₂ O powder and carbon black or carbon fiber.

Claims

1. Method of making a composite electrode structure comprising the steps of:

saturating carbon black with an electrolyte;

mixing hydrous ruthenium oxide powder and the saturated carbon black; and

forming the mixture of hydrous ruthenium oxide powder and the saturated carbon black to derive a desired electrode configuration.

2. The method of claim 1 wherein the electrolyte is sulphuric acid.

3. The method of claim 1 and further comprising the step of placing the mixture of hydrous ruthenium oxide powder and the saturated carbon black in a vacuum prior to the forming step.

4. The method of claim 1 and further comprising the step of applying pressure uniformly about the electrode configuration.

5. Method of making a composite electrode structure comprising the steps of:

saturating carbon black with sulphuric acid;

mixing hydrous ruthenium oxide powder and the saturated carbon black;

placing the mixture of hydrous ruthenium oxide powder and the saturated carbon black in a vacuum;

forming the mixture of hydrous ruthenium oxide powder and the saturated carbon black to derive a desired electrode configuration; and

applying pressure uniformly about the electrode configuration.