Eutectic solvents, with high salt concentrations and suppressed volatility, are promising alternatives to aqueous and volatile organic electrolytes for grid-scale energy storage devices such as redox flow batteries (RFBs). However, it is not known a priori which hydrogen bond acceptors and donors would form a eutectic solvent and at which compositions of these mixtures would yield desirable properties for RFBs. Specifically, the known deep eutectic solvents generally have high viscosities and low ionic conductivities, especially in the landscape of RFB electrolytes. We report a high throughput experimental (HTE) study was carried out to assess the properties of eutectic solvents based on choline chloride as the hydrogen bond acceptor and ethylene glycol and aniline as the hydrogen bond donors. In addition, water, acetonitrile, and dimethyl sulfoxide as co-solvents were examined in terms of tuning the viscosity, conductivity, and solubility of two redox-active species: methyl viologen dichloride hydrate (MVCl2·H2O, or MV for simplicity) and 2,1,3-benzothiadiazole (BTZ) that are relevant to RFBs. The HTE framework enabled the development of a rapid and comprehensive understanding of the design of new eutectic electrolytes incorporating co-solvents to improve the physicochemical and electrochemical properties for RFBs.
Dean, William, et al. "Tuning and high throughput experimental screening of eutectic electrolytes with co-solvents for redox flow batteries." Electrochimica Acta, vol. 474, Nov. 2023. https://doi.org/10.1016/j.electacta.2023.143517
Dean, William, Munoz, Miguel, Noh, Juran, et al., "Tuning and high throughput experimental screening of eutectic electrolytes with co-solvents for redox flow batteries," Electrochimica Acta 474 (2023), https://doi.org/10.1016/j.electacta.2023.143517
@article{osti_2337786,
author = {Dean, William and Munoz, Miguel and Noh, Juran and Liang, Yangang and Wang, Wei and Gurkan, Burcu},
title = {Tuning and high throughput experimental screening of eutectic electrolytes with co-solvents for redox flow batteries},
annote = {Eutectic solvents, with high salt concentrations and suppressed volatility, are promising alternatives to aqueous and volatile organic electrolytes for grid-scale energy storage devices such as redox flow batteries (RFBs). However, it is not known a priori which hydrogen bond acceptors and donors would form a eutectic solvent and at which compositions of these mixtures would yield desirable properties for RFBs. Specifically, the known deep eutectic solvents generally have high viscosities and low ionic conductivities, especially in the landscape of RFB electrolytes. We report a high throughput experimental (HTE) study was carried out to assess the properties of eutectic solvents based on choline chloride as the hydrogen bond acceptor and ethylene glycol and aniline as the hydrogen bond donors. In addition, water, acetonitrile, and dimethyl sulfoxide as co-solvents were examined in terms of tuning the viscosity, conductivity, and solubility of two redox-active species: methyl viologen dichloride hydrate (MVCl2·H2O, or MV for simplicity) and 2,1,3-benzothiadiazole (BTZ) that are relevant to RFBs. The HTE framework enabled the development of a rapid and comprehensive understanding of the design of new eutectic electrolytes incorporating co-solvents to improve the physicochemical and electrochemical properties for RFBs.},
doi = {10.1016/j.electacta.2023.143517},
url = {https://www.osti.gov/biblio/2337786},
journal = {Electrochimica Acta},
issn = {ISSN 0013-4686},
volume = {474},
place = {United States},
publisher = {Elsevier},
year = {2023},
month = {11}}