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Electrode material for electrochemical capacitor, electrochemical capacitor comprising the same, and method for the production of the same
| Details |
Inventors: Yoshio, Takasu; Murakami, Yasushi; Ueno, Mitsuo; Aoyama, Shigeo; Iwagawa, Mayumi; Sato, Kiyoshi; Asada, Seiichi;
Assignee: Hitachi Maxwell, Ltd. (Osaka-fu, JP)
Primary Examiner: Dinkins; Anthony
Assistant Examiner:
Attorney, Agent or Firm:
An electrode material for an electrochemical capacitor having a large capacity, having a titanium oxide compound such as titanium oxide, hydrated titanium oxide or their hydrogenated products, and at least one oxidizable and reducible metal element contained in the titanium oxide compound. |
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DETAILED DESCRIPTION One object of the present invention is to provide a novel electrode material to be used to produce electrodes of electrochemical capacitors, which can provide capacitors at a low cost and achieve a high capacitance.
Another object of the present invention is to provide a method for the production of such an electrode material.
A further object of the present invention is to provide a low-cost electrochemical capacitor having a large capacitance using such an electrode material.
Accordingly, the present invention provides an electrode material for an electrochemical capacitor, comprising at least one titanium oxide compound selected from the group consisting of titanium oxide, hydrated titanium oxide and their hydrogenated products, and at least one oxidizable and reducible metal element contained in the titanium oxide compound.
Such an electrode material has a large capacity, for example, 300 coulombs per one cm.
sup.
3 of the material.
Also, the present invention provides an electrochemical capacitor comprising a pair of electrodes at least one of which comprises an electrode material according to the present invention, a porous separator interposed between the pair of electrodes, and an electrolyte.
Preferably, the electrodes, separator and electrolyte are enclosed in a case.
In addition, the present invention provides a method for the production of an electrode material for an electrochemical capacitor comprising the steps of: dipping a substrate containing titanium in a solution of a salt of at least one oxidizable and reducible metal, pulling out the substrate from the solution and drying it, and calcining the dried substrate.
Furthermore, the present invention provides a method for the production of an electrode material for an electrochemical capacitor comprising the steps of: forming fine particles of an electrode material from at least one compound selected from the group consisting of salts, alkoxides and chelates of titanium, and at least one compound selected from the group consisting of salts, alkoxides and chelates of oxidizable and reducible metals, by an evaporation method, a co-precipitation method or a sol-gel method, and calcining said fine particles
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Metal Working 
