Investigate Salts type and concentration on the conductivity of Polymer Electrolyte

Mohammed Kadhim Jawad

doi:10.30723/ijp.v17i42.437

Abstract

Polymer electrolytes systems compose of (PEO+KI+I2) and (PEO+RbI+I2) with different concentration, and a fixed amount of ethylene carbonate (EC) and propylene carbonate (PC) over temperatures range 293-343 K prepared by solution cast method. The conductivity and dielectric constant of the gel electrolytes were studied. The conductivity of the electrolytes Ss & Hs increases steadily with increased concentration of salt KI and RbI. The higher value of conductivity of (4.7 10-3 @ RT S.cm-1) for S5 electrolyte which contains (KI 50%). Whereas the maximum amount of conductivity of (5.4 10³ @RT S.cm⁻ˡ) for H5 electrolyte which contains (RbI 50%) the ionic conductivity depends on the ionic radii of the migrating species (cation K⁺, Rb⁺) effect on it. As the temperature increase, the number of free ions also increases, thus increases the diffusion of ions through their free volume of the polymer. The dielectric constant decrease at higher frequencies due to the inability of dipoles to align quickly with the change of applied field. The dielectric constant proportional positively with variation temperature causes an increase in the dielectric constant. The higher the value of (εr), the better is the electrical conductivity.

Highlights

IntroductionThe electrolyte is an essential component of an electrochemical cell, a battery or fuel cell for producing electrical energy
The electrolytes are a solution of acids, bases, or salts
ethylene carbonate (EC) and propylene carbonate (PC) solution with equal wt.% has used as the solvent because of its high dielectric constant, and its role as a suitable plasticizer

Summary

Introduction

The electrolyte is an essential component of an electrochemical cell, a battery or fuel cell for producing electrical energy. It can define as an electrically conductive substance containing free ion [1]. Polymer electrolytes mechanically behave like solids, but their internal structure and, the conductivity behavior closely resembles the liquid state [3]. They have emerged as potential ionic materials for application in different electrochemical devices due to some unique properties like proper electrode–electrolyte contact and adherence, their high compliance, ease of preparation in various forms, excellent mechanical and adhesive properties [4]. The effect of variation of single salt weight ratio on ionic conductivity of polymer gel electrolytes with temperature investigated and its possible application in electronic devices

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