Solid electrolyte capacitor

• US 4,864,472 A
• Filed: 03/30/1988
• Issued: 09/05/1989
• Est. Priority Date: 04/06/1987
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yoshimura, Susumu, Tsuchiya, Sohji, Kudoh, Yasuo, Kojima, Toshikuni
• Primary Examiner(s): Griffin, Donald A.
• Application Number:
  US07/175,216
• Time in Patent Office: 524 Days
• Field of Search: 357/8, 29/570.1, 361/433 A, 361/433 S, 361/433 C, 361/306, 361/323, 361/525, 252/62.2
• US Class Current: 361/525
• CPC Class Codes: C08G 61/123 derived from five-membered heterocyclic compounds
• CPC Class Codes: H01G 9/012 specially adapted for solid capacitors
• CPC Class Codes: H01G 9/025 Solid electrolytes H01G11/54 takes precedence

Abstract

A solid electrolytic capacitor uses a solid electrolyte wherein manganese dioxide is uniformly diffused in a polymer made by electrochemical polymerization, and the solid electrolyte is disposed between a first electrode made of valve metal and having an anodic oxide film thereon and a second electrode opposite to the first electrode. The solid electrolytic capacitor shows splendid high frequency characteristics and small leakage current.

Claims

1. A solid electrolytic capacitor comprising

A first electrode made of a valve metal having an anodic oxide film thereon,

a second electrode opposing to said first electrode,

a solid electrolyte which is a uniform hybrid conductive film made by electrochemical method and comprising manganese dioxide and an electrochemical polymer, said solid electrolyte being disposed between said first electrode and said second electrode.

2. A solid electrolytic capacitor in accordance with claim 1 wherein;

said electrochemical polymer is made by anodic oxidation polymerization of a monomer selected from the group consisting of pyrrole, thiophene, thienylpyrrole, aniline, indole and furan.

3. A solid electrolytic capacitor in accordance with claim 1 wherein;

said hybrid conductive film is made by making oxidation reaction of manganese and electrochemical polymerization of monomer at the same time on a surface of said valve metal, with using

an electrolyte which is at least a monomer selected from the group consisting of pyrrole, thiophene thienylpyrrole, aniline, indole and furan, and

a supporting electrolyte which is at least one member selected from the group consisting of

a salt selected from the group consisting of manganese sulfate, manganese nitrate and manganese perchlorate,

a compound selected from the group consisting of paratoluene sulfonic acid, phthalic acid, oxalic acid and tetrafluoroborate and

a mixture of said salt and said compound.

4. A solid electrolytic capacitor in accordance with claim 1 wherein;

said manganese dioxide is substantially uniformly dispersed in said electrochemical polymer film.

5. A solid electrolyte comprising

an electrochemical polymer and

maganese dioxide substantially uniformly dispersed in said electrochemical polymer.

6. A solid electrolyte in accordance with claim 5 wherein;

said electrochemical polymer is made by making anodic oxidation polymerization of at least one monomer selected from the group consisting of pyrrole, thiophene, thienylpyrrole, aniline, indole, and furan.