Sehrish Nazir, Sushant Kumar, Markus Diantoro, Pramod K. Singh
The objective of this work is to develop solid polymer electrolyte (SPE) films using solution-casting technique where polyethylene oxide (PEO) is the base polymer. Ionic liquid—trimethylsulfonium iodide (TMSI) was added in different weight percentages to improve ionic conductivity. The maximum conductivity of 4.5 × 10–5 Scm−1 was obtained at 25 wt% TMSI. The dominant ionic nature of the film was confirmed by its ionic transference number (tion) of 0.94, making it suitable for electrochemical applications. A wide electrochemical stability window (ESW) of 3.94 V was observed using linear sweep voltammetry (LSV). A decrease in crystallinity was verified by differential scanning calorimetry (DSC), which shows improvement in amorphicity and hence increase in conductivity. The formation of polymer-ionic liquid complexes was confirmed by FTIR analysis. Using the same optimized SPE film, a supercapacitor was fabricated, achieving a specific capacitance of 36.7 Fg−1. © King Fahd University of Petroleum & Minerals 2025.
Center of Excellence in Solar-Cells and Renewable Energy, Department of Physics, SSES, Sharda University, Greater Noida, 201310, India; Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, Semarang 5, Malang, 65145, Indonesia
