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Fluorocyanoesters as Additives for Lithium-Ion Battery Electrolytes

Walton, Joshua J.; Hiasa, Takumi; Kumita, Hideyuki; Takeshi, Kazumasa; Sandford, Graham

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Authors

Joshua J. Walton

Takumi Hiasa

Hideyuki Kumita

Kazumasa Takeshi

Graham Sandford



Abstract

A range of methyl 2-fluorocyanoester derivatives were synthesized from dimethyl 2-fluoromalonate ester, and their efficacy as additives in lithium-ion battery (LIB) electrolytes was determined. The role played by the 2-fluorocyanoester additives on battery performance was explored by linear sweep cyclic voltammetry, NMR, GCMS, and XPS techniques. For all fluorocyanoester additives studied, initial reduction of the carbonyl group occurs which is then followed by formation of the corresponding radical anion. Possible degradation routes arising from loss of fluoride ion, loss of methyl radicals, and cleavage of the αβ carbon–carbon bond were observed, and all affect battery performance. Electrode protection upon addition of fluorocyanoesters to the electrolyte is the main contribution to the improvement of battery stability, but improvements on the electrode protection are somewhat offset by free radical processes initiated at the anode. Longer alkyl-chain fluorocyanoesters showed the best LIB improvement with effective cathode protection.

Citation

Walton, J. J., Hiasa, T., Kumita, H., Takeshi, K., & Sandford, G. (2020). Fluorocyanoesters as Additives for Lithium-Ion Battery Electrolytes. ACS Applied Materials and Interfaces, 12(13), 15893-15902. https://doi.org/10.1021/acsami.9b23028

Journal Article Type Article
Acceptance Date Mar 6, 2020
Online Publication Date Mar 18, 2020
Publication Date Apr 1, 2020
Deposit Date Mar 25, 2020
Publicly Available Date Mar 18, 2021
Journal ACS Applied Materials and Interfaces
Print ISSN 1944-8244
Electronic ISSN 1944-8252
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 12
Issue 13
Article Number 15893-15902
Pages 15893-15902
DOI https://doi.org/10.1021/acsami.9b23028

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces. copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.9b23028




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