Describing the unsuspected advantage of redox ionic liquids applied to electrochemical energy storage

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...

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Bibliographic Details
Published in:Current opinion in colloid & interface science 2023-04, Vol.64, p.101677, Article 101677
Main Authors: Bodin, C., Gelinas, B., Deng, J., Pithaksinsakul, Kulika, Zhu, Y., Rochefort, D., Fontaine, O.
Format: Article
Language:English
Subjects:
Chemical Sciences
Class of ionic liquids
Electrolytes
Energy storage
Redox ionic liquids
Redox shuttle effect
Self-discharge
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Summary: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. [Display omitted]
ISSN:1359-0294
1879-0399
DOI:10.1016/j.cocis.2023.101677