Ligand Exchange Conduction of Lithium Ion in a Pentaglyme-Lithium Bis(trifluoromethylsulfonyl)amide Super-Concentrated Electrolyte

Ligand exchange conduction or hopping conduction which means ions move faster than their ligands or solvents, is one of the striking phenomena in electrochemistry. Here, we report a glyme-based electrolyte where ligand exchange conduction takes place. The electrolyte is a concentrated pentaglyme (G5...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2021-01, Vol.168 (1), p.16506
Main Authors: Kitada, Atsushi, Kawata, Kio, Shimizu, Masahiro, Saimura, Masayuki, Nagata, Takashi, Katahira, Masato, Fukami, Kazuhiro, Murase, Kuniaki
Format: Article
Language:English
Subjects:
Batteries Li-ion
Electroanalytical Electrochemistry
Molten Salts - Low Temperature Molten Salts
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Summary:Ligand exchange conduction or hopping conduction which means ions move faster than their ligands or solvents, is one of the striking phenomena in electrochemistry. Here, we report a glyme-based electrolyte where ligand exchange conduction takes place. The electrolyte is a concentrated pentaglyme (G5) solution of lithium bis(trifluoromethylsulfonyl)amide (LiTf2N; Tf = SO2CF3) with molar ratio of [G5]/[LiTf2N] = 1/2. Since a diglyme (G2) solution [G2]/[LiTf2N] = 1/1 which has the same molar ratio of ether oxygen to Li+ ([O]/[Li+] = 3) does not show ligand exchange conduction, the glyme chain length may need to be long enough to bridge Li+ ions, by which the momentum exchange of Li+ ions via solvent molecules is allowed.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/abda03