| Summary: | Background: A propitious electrolyte for supercapacitors, solid polymer electrolytes (SPEs) has been used because of their flexibility and highly conducting good electrodeelectrolyte interface. Poly (methyl methacrylate) (PMMA)-based SPEs have acknowledged extensive interest due to their integrity in synthesis, good mechanical stability, low binding energy, low mass density with ionic salts, and magnificent charge carrier mobility. Interesting ionic liquids show their novelty towards conductivity enhancement and suppressing crystallinity i.e., acts as a plasticizer as well as an ionic source. Due to these advantageous properties, ionic liquids (ILs) seem to be a good player in developing highly efficient electrochemical devices. Method: To overcome the low ionic conductivity (σ) and poor mechanical stability. ILs assume to be novel candidates. This study is toward defining the role of ILs as plasticizers, not as a solvent. Result: Due to the widespread applicability of these ILs, we focus our review on taking a common example of polyether i.e., PMMA using the solution cast method. Electrical and electrochemical are also discussed in detail. Conclusion: On the the basis of electrical and photoelectrochemical performance reported in this article, we can assure the scientific community that ILs can act as a potential candidate like a plasticizer for highly efficient electrochemical devices. © 2024 Bentham Science Publishers.
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