Electrolyte capacitor

• US 5,055,975 A
• Filed: 06/15/1990
• Issued: 10/08/1991
• Est. Priority Date: 06/29/1989
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Behrend, Guenter
• Primary Examiner(s): GRIFFIN, DONALD
• Application Number:
  US07/539,349
• Time in Patent Office: 480 Days
• Field of Search: 361/507, 361/511, 361/524, 361/526, 361/523, 361/527, 252/62.2
• US Class Current: 361/527
• CPC Class Codes: H01G 9/022 Electrolytes; Absorbents

Abstract

An electrolyte capacitor composed of at least two foils, an anode foil and a cathode foil, of a valve metal that are wound with one another. The anode foil serving an anode is provided with an oxide layer acting as a dielectric. Spacers that are saturated with an operating electrolyte are arranged between the anode and cathode foils. The operating electrolyte is composed of a quaternary ammonium salt of a carboxyl acid, of an additive of the salt-forming carboxyl acid and of γ-butyrolactone as a solvent.

Claims

1. Electrolyte capacitor comprising at least two foils, an anode foil and a cathode foil, of a valve metal wound about one another, the anode foil serving as an anode being provided with an oxide layer acting as a dielectric, and spacers, that are saturated with an operating electrolyte, arranged between the anode and cathode foils, said operating electrolyte being composed of a quaternary ammonium salt of a carboxyl acid, of an additive of the salt-forming carboxyl acid and of butyrolactone as a solvent, and the operating electrolyte being composed of 0.25 through 0.8 mol/kg tetraethyl ammonium hydrogen maleate, of 0.05 through 0.16 mol/kg maleic acid and of γ

-butyrolactone.

2. Electrolyte capacitor comprising at least two foils, an anode foil and a cathode foil, of a valve metal wound about one another, the anode foil serving as an anode being provided with an oxide layer acting as a dielectric, and spacers, that are saturated with an operating electrolyte, arranged between the anode and cathode foils, said operating electrolyte being composed of a quaternary ammonium salt of a carboxyl acid, of an additive of the salt-forming carboxyl acid and of butyrolactone as a solvent;

the foils being composed of aluminum and the operating electrolyte having a pH value of 5 through 7; and

the operating electrolyte being composed of 0.25 through 0.8 mol/kg tetraethyl ammonium hydrogen maleate, of 0.05 through 0.16 mol/kg maleic acid and of γ

-butyrolactone.

3. Electrolyte capacitor comprising at least two foils, an anode foil and a cathode foil, of a valve metal wound about one another, the anode foil serving as an anode being provided with an oxide layer acting as a dielectric, and spacers, that are saturated with an operating electrolyte, arranged between the anode and cathode foils, said operating electrolyte being composed of a quaternary ammonium salt of a carboxyl acid, of an additive of the salt-forming carboxyl acid and of butyrolactone as a solvent;

the foils being composed of aluminum and the operating electrolyte having a pH value of 5 through 7 and being composed of 0.25 through 0.8 mol/kg tetraethyl ammonium hydrogen maleate, of 0.05 through 0.16 mol/kg maleic acid and of γ

-butyrolactone.