Insights into the use of polyethylene oxide in energy storage/conversion devices: A critical review

TL;DR

This review discusses recent developments in polyethylene oxide-based electrolytes, emphasizing their potential as solid polymeric separators in energy storage devices due to their unique properties and the latest research on their synthesis, modification, and performance.

Contribution

It provides a comprehensive overview of PEO properties, modification approaches, synthesis, characterization, and performance in various electrolyte systems for energy storage applications.

Findings

PEO exhibits excellent flexibility and complexation with metal salts.

Different electrolyte types show varied charge-discharge performance.

Ion transport mechanisms are crucial for optimizing energy storage devices.

Abstract

In this review, latest updates in the poly (ethylene oxide) based electrolytes are summarized. The ultimate goal of researchers globally is towards the development of free standing solid polymeric separator for energy storage devices. This single free standing solid polymeric separator may replace the liquid and separator (organic/Inorganic) used in existing efficient/smart energy technology. As an example polyethylene oxide (PEO) consist of an electron donor rich group which provides coordinating sites to the cation for migration. Owing to this exclusive structure PEO exhibits some remarkable properties such as; low glass transition temperature, excellent flexibility and ability to make complexation with various metal salts which are unattainable by another polymer host. Hence, the PEO is the most emerging candidate that have been examined or is currently under audition for application in energy storage devices. So, this review article first provides the detailed study of the PEO properties, characteristic of constituents of the polymer electrolyte and suitable approaches for the modification of polymer electrolytes. Then, the synthesization and characterizations techniques are outlined. The structures, characteristics, and performance during charge-discharge of four types of electrolyte/separators which are Liquid, Plasticized, and dispersed/intercalated electrolyte are highlighted. The suitable ion transport mechanism proposed by researchers in the different renowned group have been discussed for better understanding of the ion dynamics in such systems.