CONDUCTING POLYMER-BASED ELECTROCHEMICAL REDOX SUPERCAPACITORS USING PROTON AND LITHIUM ION CONDUCTING POLYMER ELECTROLYTES

Polypyrrole-based solid-state redox supercapacitors have been construc ted using proton and lithium ion conducting polymer electrolytes: poly (vinyl alcohol) (PVA)-H3PO4, and poly(ethylene oxide) (PEO)-LiCF3SO3 p lasticized with poly(ethylene glycol) (PEG). The capacitors have been characterized using a.c. impedance, cyclic linear sweep voltammetry an d galvanostatic charge-discharge methods. Redox capacitors based on po lypyrrole show large values of capacitance (about 1.5-5.0 mF cm(-2)) ( equivalent to a single electrode capacitance of 40-84 F g(-1) of polyp yrrole) for both the electrolytes. The values of capacitance have been found to be stable up to 1000 charge-discharge cycles between 0 and 1 .0 V. (C) 1998 Society of Chemical Industry.