Effect of ionic liquid 1-ethyl-3-methylimidazolium hydrogen sulfate on zinc-ion dynamics in PEO/PVdF blend gel polymer electrolytes
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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.
KeywordsGel polymer electrolytes Ionic liquid Ionic conductivity XRD FTIR SEM Dielectric behaviour
One of the author (R.R.) greatly acknowledges the University of Madras for the award of University Research Fellowship (URF). The authors would also like to thank the National Centre for Nanoscience and Nanotechnology, University of Madras, for providing the necessary experimental facilities for SEM analysis.
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