Preparation and Characterization of Ionic liquid-Added Poly (Vinyl Alcohol) Based Solid Polymer Electrolyte for Electrical Double Layer Capacitor Application

Lim, Wei Quan (2024) Preparation and Characterization of Ionic liquid-Added Poly (Vinyl Alcohol) Based Solid Polymer Electrolyte for Electrical Double Layer Capacitor Application. Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

The preparation of polyvinyl alcohol (PVA)/magnesium trifluoromethanesulfonate (MgTf)/1-butyl-3-methylimidazolium bromide (BmImBr) based solid biopolymer electrolytes is prepared by the technique of solution casting. PVA/MgTf based solid biopolymer electrolyte exhibits the maximum ionic conductivity of (3.03±0.01) ×10-6 Scm-1 while PVA/MgTf/BmIm-Br based solid biopolymer electrolyte exhibits the maximum ionic conductivity of (5.90±0.01) ×10-4 Scm-1 at ambient temperature upon adulteration of 45 wt.% of BmImBr and obeys Vogel-Tamman-Fulcher (VTF) theory which indicates the free volume theory. Besides that, the addition of ionic liquid into the solid polymer electrolyte shows the lower glass transition than PVA/MgTf based solid polymer electrolyte which can show in differential scanning calorimetry (DSC). Moreover, upon impregnation of ionic liquid in PVA/MgTf based solid polymer electrolyte, there is a decrease in electrochemical potential window due to the formation of ion pairs and ion aggregates. The FTIR analysis proves that PVA, MgTf and BmImBr are mixing will in solid polymer electrolyte. Fabricated electrical double layer capacitor (EDLC) cell can be prepared by sandwiching the highest ionic conductivity of solid polymer electrolyte in two system with two carbon electrodes. The fabricated EDLC cell is further characterized to indicate the electrochemical properties. Based on the CV analysis, there is an increase in specific capacitance from 2.16×10-1 Fg-1 to 2.02 Fg-1 after inclusion of ionic liquid. The obtained results are good agreement with GCD analysis.