Solid electrolyte capacitor and method of making

Details Solid electrolyte capacitor and method of making Solid electrolyte capacitor and method of making

1991-09-06

1992-11-03

Griffin, Donald

Electricity: electrical systems and devices

Electrolytic systems or devices

Double layer electrolytic capacitor

320 15, H01G 900, H02J 704

Patent

active

051610949

ABSTRACT:
A technique is disclosed for supplying backup power by providing a solid-state electrochemical capacitor with a layer of solid electrolyte material composed of RbAg.sub.4 I.sub.5, a layer of anode material composed of carbon and RbAg.sub.4 I.sub.5 adjoining a first surface of the electrolyte material, and a layer of cathode material composed of carbon and RbAg.sub.4 I.sub.5 adjoining a second surface of the electrolyte material. A current is supplied to charge the anode of the capacitor structure to a voltage in the range from 0.50 volts to 0.66 volts to cause storage of charge in the capacitor structure in both a double layer capacitance mode and a pseudo capacitance mode. The charged up capacitor is used to supply a backup voltage to a utilization device. In one embodiment, the anode includes a silver disk adjoining the electrolyte layer. In another embodiment, the anode contains platinized activated carbon and RbAg.sub.4 I.sub.5 to reduce silver dendrite growth during charging. In another embodiment, a varying concentration of silver is included in the anode layer. A technique for parallel charging and serial discharging of a plurality of the capacitors is disclosed.

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