Describing the unsuspected advantage of redox ionic liquids applied to electrochemical energy storage |
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| Institution: | 1. ICGM, Université de Montpellier, CNRS, 34293 Montpellier, France;2. Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada;3. Institute for Advanced Study & College of Food and Biological Engineering, Chengdu University, Chengdu 610106, China;4. Molecular Electrochemistry for Energy Laboratory, VISTEC, Rayong, 21210, Thailand;1. Deakin University, Institute for Frontier Materials, 3216 Waurn Ponds, Geelong, VIC, Australia;2. LINTEC OF AMERICA, INC., Nano-Science and Technology Center, 2900 E. Plano Pkwy. Suite 100, Plano, TX, 75074, USA;3. School of Science, RMIT University, 124 La Trobe Street, Melbourne, VIC, 3000, Australia;4. Carbon Nexus, Institute for Frontier Materials, Deakin University, Waurn Ponds, VIC, 3216, Australia;5. Khalifa University, Department of Chemical Engineering, Abu Dhabi, United Arab Emirates;7. Center for Membrane and Advanced Water Technology, Khalifa University, Abu Dhabi, United Arab Emirates;1. CNRS, CEMHTI UPR3079, Univ. Orléans, 1D Avenue de La Recherche Scientifique, Orléans, France;2. RS2E, CNRS FR3459, 15 Rue Baudelocque, Amiens, France |
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| Abstract: | Ionic liquids are a class of solvents widely studied in the literature for various applications. As a subclass of ionic liquids, redox ionic liquids can endow charge exchange properties (electrons transfer) to these electrolytes for electrochemical energy storage. In this review article, we propose to study this family of ionic liquids and suggest a chronological classification. We introduce five generations of redox ionic liquids with different basic compounds such as polyethylene glycol, ferrocene, different linker lengths, TFSI anion, and biredox ionic liquids. The versatility of the redox ionic liquids synthesis will be discussed as well as the fundamental and applied aspects of their use as electrolytes, which have high charge densities. The impact of the redox ionic liquids on the electrochemical mechanisms will be described. We also present how the redox shuttle effect, detrimental to supercapacitors, can be prevented while it can be used to improve lithium-ion batteries. |
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| Keywords: | Redox ionic liquids Electrolytes Class of ionic liquids Energy storage Redox shuttle effect Self-discharge |
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