Abstract
This study investigates the ionic conduction dependence on the size of alkaline cations in gel polymer electrolytes based on double iodide can enhance by incorporating a salt having a bulky cation. Group of gel polymer electrolytes with polyethylene oxide (PEO) as a host matrix based on double salts potassium iodide (KI) and rubidium iodide (RbI) with different weight ratio prepared by using solution cast technique. The maximum value of conductivity reaches (6.03 10⁻3 at 293 K) S/cm for an electrolyte which content (KI 45%, RbI 5%) from binary salt. The ionic conductivity of for gel polymer electrolytes gradually increases by increasing temperature. The real dielectric constant results confirm that the dielectric behavior of the PEO material is a thermally activated process. FTIR results confirm that the shifting of peaks is another way to prove the interactions between PEO and binary salt ascribed to the formation of a transient cross-linking complex between the cations of the ionic liquids and the ether oxygen of the PEO.
Highlights
Polymer electrolytes are favorable candidates for electrochemical apparatus enforcement mainly because they mechanically conduct such as solids and the conductivity demeanor neatly resembles the liquid state [1]
The current study focused on enhancing the gel polymer electrolyte as a result of many coveted characteristics of gel electrolytes over liquid electrolyte [2]
polyethylene oxide (PEO) based electrolytes with double salts prepared by using solution casting method
Summary
Polymer electrolytes are favorable candidates for electrochemical apparatus enforcement mainly because they mechanically conduct such as solids and the conductivity demeanor neatly resembles the liquid state [1]. The current study focused on enhancing the gel polymer electrolyte as a result of many coveted characteristics of gel electrolytes over liquid electrolyte [2]. The first polymer noticed to have the capability to dissolve alkali metal was polyethylene oxide (PEO) [3]. It shows significant conductivity and elastic chain structure at room temperature [4]. The primary feature of a PEO is its high dissolution strength. It may create a complex readily with many iodides and equipping a direct track for positively charged ions migration as a result of the presence of (–CH2–CH2–Ӧ–)n in the polymer chain. PEO is a linear polymer included the polar ether group
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