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Abstract
Polymer electrolytes and composites have prevailed in the high performance and mobile marketplace during recent years. Polymer-based solid electrolytes possess the benefits of low flammability, excellent flexibility, good thermal stability, as well as higher safety. Several researchers have paid attention to the optical properties of polymer electrolytes and their composites. In the present review paper, first, the characteristics, fundamentals, advantages and principles of various types of polymer electrolytes were discussed. Afterward, the characteristics and performance of various polymer hosts on the basis of specific essential and newly published works were described. New developments in various approaches to investigate the optical properties of polymer electrolytes were emphasized. The last part of the review devoted to the optical band gap study using two methods: Tauc’s model and optical dielectric loss parameter. Based on recently published literature sufficient quantum mechanical backgrounds were provided to support the applicability of the optical dielectric loss parameter for the band gap study. In this review paper, it was demonstrated that both Tauc’s model and optical dielectric loss should be studied to specify the type of electron transition and estimate the optical band gap accurately. Other parameters such as absorption coefficient, refractive index and optical dielectric constant were also explored.
Highlights
Polymer electrolytes (PEs) were introduced for the first time by Fenton et al in 1973 [1], and their technological significance on large-scale applications came to market in early 1980 [2]
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The approaches to improve the optical properties of polymer electrolytes were highly emphasized
Summary
Polymer electrolytes (PEs) were introduced for the first time by Fenton et al in 1973 [1], and their technological significance on large-scale applications came to market in early 1980 [2]. (PEs) are membranes that consist of incorporated dissolved salts in polymer matrices (high molecular weight) [8] These almost solid without solvent systems possess ionic conduction property; they have extensively been used in a number of electrochemical devices, for example, rechargeable batteries, solid-state batteries and especially lithium ion batteries. The interest in dealing with the nature of the light interaction with such new materials increases, especially changing from solar cells to light-emitting devices Those polymers that possess unique optical properties to encourage many research groups to take into consideration these polymers to be utilized in optical devices, sensors and LEDs as well. This modification resulted in a lesser degree of crystallinity and a small glass transition temperature Tg of polymer electrolytes [35,45]
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