Abstract
A solid polymer electrolyte (SPE) film with improved mechanical and thermal stability has drawn significant attention in the field of polymer research due to their technological applications in energy storage devices. We have explored the electrical properties of the blend SPE composed of 20 wt. % poly(ethylene oxide), 80 wt. % polyvinylidene fluoride, and 35 wt. % NH4I by introducing a plasticizer ethylene carbonate (EC). A significant enhancement of electrical conductivity has been found in the composite SPE containing 80 wt. % of EC. We have confirmed the formation of a hydrogen bonding network between the carbonyl group (C=O) of EC and the cations NH4+. Therefore, EC facilitates the new coordination sites via the hydrogen bonding network with the cations NH4+, which eventually leads to the enhancement of conductivity up to a maximum value of 1.2 × 10−4 S/cm at 80 wt. % of EC. The increase in the relative percentage of contact ions over free ions at 80% of EC, as estimated from the FTIR study, is thus intriguing. Therefore, we have proposed an ion transport mechanism based on ion hopping through different coordinating sites mediated by EC. Dielectric relaxation of the composite SPE has been best delineated by a two-parameter Mittag-Leffler function. The exponents obtained from the fit of the experimental decay function with the two-parameter Mittag-Leffler function in the entire time domain are positive and less than one, suggesting non-Debye relaxation in the polymer composite system under investigation.
Highlights
The solid state batteries have drawn much attention for new generation sustainable energy storage devices due to their high energy density capacity,1 leading to high performance and safety
We have proposed a novel mechanism of ion transport through the polymer composite matrix containing ethylene carbonate (EC)
We have analyzed our results of impedance spectroscopy in order to gain insights into the dielectric relaxation behavior of the polymer composites
Summary
The solid state batteries have drawn much attention for new generation sustainable energy storage devices due to their high energy density capacity, leading to high performance and safety. The performance of large-scale energy storage devices depends on the proper choice of the electrolyte. The solid polymer electrolyte (SPE) possesses many advantages due to their proper shape, favorable mechanical strength, better thermal stability, good electrode–electrolyte contact, and long life cycle.. SPE is an emerging option for the fabrication of next-generation charge storage devices promising low cost and overcoming the problem of leakage and corrosion at the electrode. The practical applications of SPE in the charge storage device have impeded due to their low conductivity at room temperature.. One of the objectives of the present study is to improve the ionic conductivity of SPE by making a composite film containing a suitable salt and a plasticizer The practical applications of SPE in the charge storage device have impeded due to their low conductivity at room temperature. one of the objectives of the present study is to improve the ionic conductivity of SPE by making a composite film containing a suitable salt and a plasticizer
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