Effect of Ionic Liquid on Polyacrylic Acid Ionogel Based Polymer Electrolyte for Electrical Double Layer Capacitor (EDLC) Application

Ong, Kar Kien (2024) Effect of Ionic Liquid on Polyacrylic Acid Ionogel Based Polymer Electrolyte for Electrical Double Layer Capacitor (EDLC) Application. Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

Ionogel polymer electrolytes comprising of polyacrylic acid (PAA) /lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) /1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (BMIMTFSI) are prepared by solution casting technique. PAA-based gel polymer electrolyte exihibits the maximum ionic conductivity of (2.39±0.01) mScm-1 while PAA-based ionogel polymer electrolyte manifests the maximum ionic conductivity of (3.03±0.01)×10-3 Scm-1 at ambient temperature upon impregnation of 35 wt.% of BMIMTFSI and follows the Arrhenius theory where the ion hopping mechanism takes place by mobile ions within the PAA backbone. Apart from that, introduction of ionic liquid into the PAA backbone decreases the glass transition temperature which is proven by the findings obtained from differential scanning calorimetry (DSC). Besides, upon impregnation of ionic liquid in the PAA backbone, there is a slight increase in electrochemical potential and thermal stability. Based on FTIR analysis, it proves the complexation between PAA, LiTFSI, and BMIMTFSI in the ionogel polymer electrolyte. An electrical double layer capacitor (EDLC) cell is thus fabricated using the highest conducting ionogel polymer electrolytes and two identical carbon-based electrodes. The resulting EDLC cell shows better electrochemical performances than the ionic liquid-free gel polymer electrolyte. Upon addition of ionic liquid to the ionogel polymer electrolytes, the EDLC shows an increase in specific capacitance from 10.25 Fg-1 to 13.18 Fg-1, as illustrated in cyclic voltammetry studies. The obtained results are in good agreement with GCD findings.