The Effect of Ionic Liquid on the Development of Poly (Vinyl Alcohol) (PVA)-Based Ion Conductors for Electric Double Layer Capacitors (EDLCS) Application

Wong, Celine Chia Qi (2020) The Effect of Ionic Liquid on the Development of Poly (Vinyl Alcohol) (PVA)-Based Ion Conductors for Electric Double Layer Capacitors (EDLCS) Application. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

The biodegradable BmImBr incorporated-poly(vinyl alcohol)-LiTf polymer electrolytes had been prepared by solution casting method. The effect of the introduction of different weight ratio of BmImBr into the polymer-salt electrolyte system is evaluated throughout the research study. Upon the addition of 50 wt.% BmImBr, the ionic conductivity at room temperature increases from (9.73±0.04) ×10-6 S cm-1 to (1.96±0.01) ×10-4 S cm-1. Besides, the ionic liquid free-polymer electrolyte obeys the Arrhenius theory and the most conducting ionic liquid added-polymer electrolyte obeys the Vogel-Tamman-Fulcher (VTF) theory, which is correlated to the free volume model. The glass transition temperature (Tg) determined from Differential Scanning Calorimetry (DSC) analysis, demonstrate a decreasing trend as the weight ratio of BmImBr introduced increase, from 81.09 ºC to 13.65 ºC. This decrease in Tg is said to be caused by the plasticising effect of BmImBr. The addition of BmImBr is also able to improve the thermal stability of the polymer electrolyte through the interaction between PVA and BmImBr by carrying out Thermogravimetric (TGA) study. The Fourier Transform Infrared (FTIR) studies indicate that the complexation between the PVA, LiTf and BmImBr occurs. Electric double layer capacitor (EDLC) are fabricated by sandwiched the highest ionic conductivity polymer electrolyte between two carbon electrodes. The EDLC fabricated is then subjected to Cyclic voltammetry (CV) and Galvanostatic Charge-Discharge (GCD) analyses to identify the performance of the cell. The ionic liquid, BmImBr is proved to have improve the specific capacitance of the EDLC.