Non-Newtonian Dynamics in Water-in-Salt ElectrolytesClick to copy article linkArticle link copied!
- Tsuyoshi YamaguchiTsuyoshi YamaguchiGraduate School of Engineering, Nagoya University, Furocho, Chikusa, Nagoya, Aichi 464-8603, JapanMore by Tsuyoshi Yamaguchi
- Andrei DukhinAndrei DukhinDispersion Technology, Incorporated, 364 Adams Street, Bedford Hills, New York 10507, United StatesMore by Andrei Dukhin
- Young-Jay RyuYoung-Jay RyuCenter for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United StatesMore by Young-Jay Ryu
- Dongzhou ZhangDongzhou ZhangCenter for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United StatesMore by Dongzhou Zhang
- Oleg BorodinOleg BorodinEnergy Storage Branch, Sensor and Electron Devices Directorate, United States Army Research Laboratory, Adelphi, Maryland 20783, United StatesMore by Oleg Borodin
- Miguel A. GonzálezMiguel A. GonzálezInstitut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, FranceMore by Miguel A. González
- Osamu YamamuroOsamu YamamuroInstitute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, JapanMore by Osamu Yamamuro
- David L. PriceDavid L. PriceCNRS and Université d’Orléans, CEMHTI, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, FranceMore by David L. Price
- Marie-Louise Saboungi*Marie-Louise Saboungi*E-mail: [email protected]IMPMC, Sorbonne Université and CNRS, 4 Place Jussieu, F-75252 Paris, FranceMore by Marie-Louise Saboungi
Abstract

Water-in-salt electrolytes have attracted considerable interest in the past decade for advanced lithium-ion batteries, possessing important advantages over the non-aqueous electrolytes currently in use. A battery with a LiTFSI–water electrolyte was demonstrated in which an operating window of 3 V is made possible by a solid–electrolyte interface. Viscosity is an important property for such electrolytes, because high viscosity is normally associated with low ionic conductivity. Here, we investigate shear and longitudinal viscosities using shear stress and compressional longitudinal stress measurements as functions of frequency and concentration. We find that both viscosities are frequency-dependent and exhibit almost identical frequency and concentration dependences in the high-concentration region. A comparison to quasielastic neutron scattering experiments suggests that both are governed by structural relaxation of the TFSI– network. Thus, LiFTSI–water electrolytes appear to be an unusual case of a non-Newtonian fluid, where shear and longitudinal viscosities are determined by the same relaxation mechanism.
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This article is cited by 3 publications.
- Tsuyoshi Yamaguchi. Molecular Dynamics Simulation Study on Heterogeneous Structure, Rheology, and Dynamic Correlation of Concentrated Aqueous Solutions of a Lithium Salt. The Journal of Physical Chemistry B 2025, 129
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, 1026-1035. https://doi.org/10.1021/acs.jpcb.4c07942
- Antonio Faraone, Fei Wang, Saya Takeuchi, Joseph A. Dura. Structural Relaxation and Nanodomain Dynamics in Highly Concentrated Electrolytes for Zinc Batteries. The Journal of Physical Chemistry C 2024, 128
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