电解质
材料科学
湿度
电导率
聚合物
介电谱
聚乙烯醇
离子电导率
电介质
高分子化学
化学工程
复合材料
分析化学(期刊)
电化学
化学
有机化学
电极
工程类
物理
热力学
物理化学
光电子学
作者
Kailash Kumar,Kushal Mehrotra,Ashish Raj,Shri Prakash Pandey,Bhaskar Bhattacharya
标识
DOI:10.1002/masy.202100491
摘要
Abstract Polymer electrolytes are studied worldwide for their possible applications in various electrochemical devices. In the last few decades, a large number of polymer electrolytes have been developed and characterized. However, in most cases, the effect of humidity has been ignored. In this paper, we report a systematic study on a polymer electrolyte's electrical and dielectric properties at different humidity. The chosen system is a Polyvinyl Alcohol (PVA) based polymer electrolyte in which potassium iodide (KI) with differing weight percentage is selected as the dopant salt for the synthesis of PVA‐KI films. Four different compositions of PVA‐KI films are synthesized using the solution cast technique. Electrical impedance spectroscopy (EIS) technique is used to determine its conductivity at three different humidity levels: 55%, 75%, and 85%. Analysis of dielectric permittivity and electrical modulus of the films is also done at these humidity levels. The highest conductivity for all the four different compositions of films is found to be at 85% humidity level, of which the optimum ionic conductivity is seen in the 75:25 composition of PVA:KI with a value of 1.25×10 −4 S cm −1 .The number of charge carriers and their mobility are calculated for all samples at different humidity levels. A correlation has been established between the conductivity of the films and the mobility of charge carriers.
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