Mixed conductive carbon and electrode

• US 20060219986A1
• Filed: 02/24/2004
• Published: 10/05/2006
• Est. Priority Date: 02/25/2003
• Status: Abandoned Application

• Current Assignee: Ebara Corporation
• Original Assignee: Ebara Corporation
• Inventors: Shimoyama, Masashi, Yokota, Hiroshi, Takeda, Kazuyoshi, Akiyama, Eiichi
• Application Number:
  US10/546,200
• Publication Number:
  US 20060219986A1
• Time in Patent Office: Days
• US Class Current: 252/510
• CPC Class Codes: D01F 11/10 of carbon
• CPC Class Codes: H01M 4/0433 Molding
• CPC Class Codes: H01M 4/583 Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: H01M 4/96 Carbon-based electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An electrode having both of electronic conductivity and ionic conductivity is provided. An electrode provided with a mixed conductive carbon having electronic conductivity and ionic conductivity, the carbon containing an ion-dissociative group on the surface thereof. The use of a platelet-type or herringbone-type carbon fiber as the carbon material enables the introduction of ion-dissociative groups at a high density with continuity, whereby ion paths are effectively formed and an excellent ionic conductivity can be imparted, in addition to the electron conductivity inherent in the carbon fiber.

Claims

1. A mixed conductive carbon having electronic conductivity and ionic conductivity, comprising an ion-dissociative group on the surface of a carbon material.

2. The mixed conductive carbon according to claim 1, wherein the carbon material is a carbon fiber.

3. The mixed conductive carbon according to claim 2, wherein the diameter of the carbon fiber is in a range of 5 to 1,000 nm.

4. The mixed conductive carbon according to claim 2, wherein the carbon fiber is a platelet-type or herringbone-type carbon fiber.

5. The mixed conductive carbon according to claim 1, wherein the ion-dissociative group is directly bonded to graphene constituting the carbon material.

6. The mixed conductive carbon according to claim 1, wherein the ion-dissociative group is bonded to graphene through a binding group.

7. The mixed conductive carbon according to claim 1, wherein the ion-dissociative group is a proton-dissociative group.

8. The mixed conductive carbon according to claim 7, wherein the proton-dissociative group is selected from the group consisting of —

OH, —

SO₃H, —

COOH, —

OSO₃H and —

OPO(OH)₃.

9. The mixed conductive carbon according to claim 1, wherein the ion-dissociative group is a hydroxyl ion-dissociative group.

10. The mixed conductive carbon according to claim 9, wherein the hydroxyl ion-dissociative group is selected from the group consisting of ammonium hydroxide derivatives, pyridinium hydroxide derivatives and imidazolium hydroxide derivatives.

11. An electrode provided with the mixed conductive carbon according to claim 1.

12. A method for preparing a mixed conductive carbon, comprising a step of treating a carbon material in sulfuric anhydride or fuming sulfuric acid to introduce a sulfonic acid group thereinto.

14. The method according to claim 12, wherein the carbon material is a carbon fiber.

13. A method for preparing a mixed conductive carbon, comprising a step of subjecting the surface of a carbon material to an oxidation treatment, and a step of reacting the surface with a molecule having a proton-dissociative group or a hydroxyl ion-dissociative group.