Effect of ionic liquid 1-ethyl-3-methylimidazolium hydrogen sulfate on zinc-ion dynamics in PEO/PVdF blend gel polymer electrolytes

Room temperature ionic liquid 1-ethyl-3-methylimidazolium hydrogen sulfate (EMIHSO 4 ) incorporated gel polymer electrolyte membranes were prepared with PEO/PVdF blend containing 15 wt % zinc triflate (Zn (CF 3 SO 3 ) 2 ) salt. These electrolyte membranes with different ionic liquid concentrations w...

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Bibliographic Details
Published in:Ionics 2019-03, Vol.25 (3), p.1137-1146
Main Authors: Rathika, R., Austin Suthanthiraraj, S.
Format: Article
Language:English
Subjects:
Cations
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrical impedance
Electrical resistivity
Electrochemical analysis
Electrochemistry
Electrolytes
Electromagnetic interference
Electronegativity
Energy Storage
Fluorine
Fourier transforms
Ion currents
Ion dynamics
Ion transport
Ionic interactions
Ionic liquids
Ions
Membranes
Optical and Electronic Materials
Original Paper
Polymers
Renewable and Green Energy
Scanning electron microscopy
Spectrum analysis
X-ray diffraction
Zinc
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Summary:Room temperature ionic liquid 1-ethyl-3-methylimidazolium hydrogen sulfate (EMIHSO 4 ) incorporated gel polymer electrolyte membranes were prepared with PEO/PVdF blend containing 15 wt % zinc triflate (Zn (CF 3 SO 3 ) 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 % EMIHSO 4 -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 % EMIHSO 4 tend to release more number of free ions. An impressive amount of amorphous phase also emerged with an addition of 10 wt % EMIHSO 4 by altering the semi-crystalline nature of PEO thereby facilitating rapid ion transport to occur.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-018-2709-x