Proton conducting flexible solid blend polymer electrolytes based on poly(ethylene oxide) and poly(vinylidene fluoride-co-hexa fluoropropylene) for electric double-layer capacitor applications

Solid blend polymer electrolytes are prepared(SBPE) comprising poly(ethylene oxide), poly(vinylidene fluoride-co-hexafluoro propylene), and different wt% of ammonium bromide (NH4Br) salt using solution casting approach. The structure, morphology, and chemical bond formation within the prepared polymer electrolytes are confirmed utilizing techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The sample with least degree of crystallinity has higher ionic conductivity of 2.55 x 10(-4) S cm(-1) at 303 K temperature. The transference numbers of ions (t(ions)) (t(ions)) and electrons (t(ele)) (t(ele)) are found to be 0.9978 and 0.0022 accordingly. The linear sweep voltammetry(LSV) demonstrates that the potential window of the better conducting polymer electrolyte is 2 V. Cyclic voltammetry (CV) studies confirm that there is no redox reaction in the polymer electrolytes and scan rate influences specific capacitance. The values of specific capacitance, energy density, and power density of fabricated electric double-layer capacitor (EDLC) are 8.12 F g(-1), 1.12 Wh kg(-1), and 125 W kg(-1), respectively.