Abstract
We have studied ionic conductivity and dielectric permittivity of PEO-LiClO4 solid polymer electrolyte plasticized with propylene carbonate. Differential scanning calorimetry and X-ray diffraction studies confirm minimum volume fraction of crystalline phase for the polymer electrolyte with 40 wt. % propylene carbonate. The ionic conductivity exhibits a maximum for the same composition. The temperature dependence of the ionic conductivity has been well interpreted using Vogel-Tamman-Fulcher equation. Ion-ion interactions in the polymer electrolytes have been studied using Raman spectra and the concentrations of free ions, ion-pairs and ion-aggregates have been determined. The ionic conductivity increases due to the increase of free ions with the increase of propylene carbonate content. But for higher content of propylene carbonate, the ionic conductivity decreases due to the increase of concentrations of ion-pairs and ion-aggregates. To get further insights into the ion dynamics, the experimental data for the complex dielectric permittivity have been studied using Havriliak–Negami function. The variation of relaxation time with temperature obtained from this formalism follows Vogel-Tamman-Fulcher equation similar to the ionic conductivity.
Highlights
Major research efforts have been focused on the development of new materials for rechargeable batteries due to depletion of non-renewable resources
We have studied ionic conductivity and dielectric permittivity of PEO-LiClO4 solid polymer electrolyte plasticized with propylene carbonate
The decrease of the peak intensity indicates that the amorphous phase in the polymer electrolytes increases due to the addition of propylene carbonate (PC) to the polymer electrolytes and it is a maximum for 40 wt. % PC
Summary
Major research efforts have been focused on the development of new materials for rechargeable batteries due to depletion of non-renewable resources. Two important parameters such as ionic concentration and ionic mobility influence the conductivity in polymer electrolytes. In this contest the study of ion-ion and ion-polymer interactions is of great interest.[17,18,19] Electrical conduction
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