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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) Schematic illustration of gel polymer electrolyte (GPE) synthesis [123]. Copyright 2016 The Royal Society of Chemistry. (b) Percolation threshold mechanism for polymer electrolytes [126]. Copyright 2010 Elsevier.