Determination of ionic conductivity of polyvinyl alcohol-based gel polymer electrolyte containing plasticizer for supercapacitor application

Tan, Jun Yu (2021) Determination of ionic conductivity of polyvinyl alcohol-based gel polymer electrolyte containing plasticizer for supercapacitor application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The supercapacitor is an advanced technology that act as an energy storage mechanism that contain preferable capacitance value when comparing to a conventional capacitor. Gel polymer electrolyte (GPE) is one of the important elements to improve supercapacitor electrochemical performance. The outstanding properties of gel polymer electrolyte when compared to liquid and solid based electrolyte has attracted the interest of researchers to concern about the topic. The research focused to determine the ionic conductivity of polyvinyl alcohol (PV A) based gel polymer electrolytes containing plasticizer for supercapacitor applications. The GPE was prepared by using solvent, KI salt, PV A and different weight percentage of DEC. The highest ionic conductivity obtained was from 25% DEC in PYA GPE with a value of 10.99 mS.cm·1. The plasticizer can amend the physical structure of polymers to make the ions transportation easier through polymer which helps in the improvement of ionic conductivity. The rGO AC-based electrode was prepared and characterized. The Io/Ia ratio from Raman spectroscopy shown a value of 0.992 which represents the good quality of graphitic structure on the electrode. The XRD of the electrode shown two sharp peaks of the height of 26.64° and 43.43° which corresponds to the (002) diffraction of inorganic carbon and the ( 100) diffraction of graphitized carbon respectively. The supercapacitor was fabricated using GPE and rGO electrode by using a conventional slurry technique. The supercapacitor electrochemical performance was tested out with Cyclic Voltammetry (CV) and the highest specific capacitance (Csp) obtained is from 15% DEC of PV A GPE with a value of 55.56 Fg-1. The GPE was then undergone Galvanostatic charge-discharge (GCD) and obtained 0.16 Fg·1 of Csp- The difference in values of Csp obtained from CV and GCD is due to the degradation of electrolyte and electrode. Due to time constraints, a better quality of electrolyte and electrode are not been prepared.

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