Abstract
Room temperature ionic liquid 1-ethyl-3-methylimidazolium hydrogen sulfate (EMIHSO4) incorporated gel polymer electrolyte membranes were prepared with PEO/PVdF blend containing 15 wt % zinc triflate (Zn (CF3SO3)2) salt. These electrolyte membranes with different ionic liquid concentrations were characterized in detail by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), differencial scanning calorimetry (DSC) and electrical impedance spectroscopy (EIS). Amongst all the ionic liquid concentrations investigated, 10 wt % EMIHSO4-incorporated gel electrolyte showed interesting electrochemical performance with the highest ionic conductivity of 5.8 × 10−4 S cm−1 at room temperature. Besides, ionic interactions of ethyl methylimidozolium cation (EMI+), ether oxygens of PEO and electronegative fluorine ions of PVdF with triflate anions and zinc cations at 10 wt % EMIHSO4 tend to release more number of free ions. An impressive amount of amorphous phase also emerged with an addition of 10 wt % EMIHSO4 by altering the semi-crystalline nature of PEO thereby facilitating rapid ion transport to occur.
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