Solid electrolytic capacitor

• US 4,780,796 A
• Filed: 12/28/1987
• Issued: 10/25/1988
• Est. Priority Date: 01/13/1987
• Status: Expired due to Term

• Current Assignee: Solid Electrolytic Capacitor
• Original Assignee: Japan Carlit (Shanghai) Co. Ltd. (Carlit Holdings Co., Ltd.)
• Inventors: Fukuda, Minoru, Isa, Isao, Yamamoto, Hideo
• Primary Examiner(s): GRIFFIN, DONALD
• Application Number:
  US07/138,591
• Time in Patent Office: 302 Days
• Field of Search: 29/570.1, 361/433, 437/1, 429/212, 429/213
• US Class Current: 361/525
• CPC Class Codes: H01G 11/48 Conductive polymers
• CPC Class Codes: H01G 11/56 Solid electrolytes, e.g. gels; Additives therein
• CPC Class Codes: H01G 9/025 Solid electrolytes H01G11/54 takes precedence
• CPC Class Codes: H01G 9/028 Organic semiconducting electrolytes, e.g. TCNQ
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A solid electrolytic capacitor having excellent characteristics in terms of both electrical properties and thermal stability is obtained by employing a solid electrolyte comprising both an electrically conductive polymer layer (I) formed by a chemical oxidation method and an electrically conductive polymer layer (II) formed by an electrochemical oxidation method.

Claims

1. A solid electrolytic capacitor having excellent characteristics in terms of both electrical properties and thermal stability comprising, in combination, an electrode having an adherent dielectric oxide coating thereon and a solid electrolyte comprising an electrically conductive polymer layer (I) formed by a chemical oxidation method comprising contacting a monomer with an oxidizing agent and an electrically conductive polymer layer (II) formed on the electrically conductive polymer layer (I) by an electrochemical oxidation method.

2. The solid electrolytic capacitor according to claim 1, wherein said electrode is made of aluminum or tantalum.

3. The solid electrolytic capacitor according to claim 1, wherein said electrically conductive polymer layer (I) is polypyrrole or polyaniline.

4. The solid electrolytic capacitor according to claim 1, wherein said oxidizing agent is chlorine dioxide.

5. The solid electrolytic capacitor according to claim 1, wherein said electrically conductive polymer layer (II) is polypyrrole or polyaniline.