SOLID-STATE SUPERCAPACITOR BASED ON POLYMER FILM SEPARATOR AND THERMAL COATED SILVER ELECTRODE

Abstract

The development of efficient energy storage devices is crucial in the developing world. A supercapacitor is going to bridge the gap between fast charging electrolytic capacitor and longer charge storage devices l ike rechargeable batteries. In this report, a polymer-based solid-state supercapacitor is designed and fabricated using silver deposit electrode and PVA/Phosphoric acid-based electrolyte. The electrode material is fabricated using a vapor deposition technique, depositing silver onto the glass substrate at a high vacuum environment. X-ray diffraction (XRD) has been used to identify and confirm the proper phase formation of the crystalline material. Surface characterization has been performed using atomic for ce microscopy (AFM). In this report, two types of supercapacitor devices are fabricated. In type A supercapacitor, the electrode was made using Ag deposited on a glass substrate, and in type B supercapacitor, the electrode was made using silver deposited on a glass substrate and annealed at 200 °C. A solid -state polymer electrolyte (SPE) is used as an electrolyte -separator medium. Since a solidstate electrolyte is used, therefore the mobility of the dissociated ions in the electrolyte system is reduced aff ecting the overall specific capacitance of the system. The specific capacitance of Ag deposited on Glass substrate (type A electrode) type supercapacitor is observed 0.71 F/g and for silver deposited on Glass substrate and annealed at 200 °C (type B electr ode) type supercapacitor is found 1.05 F/g at a high scan rate of 10 mVs-1.