Conducting polymer-based electrochemical redox supercapacitors using proton and lithium ion conducting polymer electrolytes

Polypyrrole‐based solid‐state redox supercapacitors have been constructed using proton and lithium ion conducting polymer electrolytes: poly(vinyl alcohol) (PVA)–H3PO4, and poly(ethylene oxide) (PEO)–LiCF3SO3 plasticized with poly(ethylene glycol) (PEG). The capacitors have been characterized using a.c. impedance, cyclic linear sweep voltammetry and galvanostatic charge–discharge methods. Redox capacitors based on polypyrrole show large values of capacitance (about 1·5–5·0 mFcm‐2) (equivalent to a single electrode capacitance of 40–84 Fg‐1 of polypyrrole) 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. © 1998 Society of Chemical Industry