Journal
ENERGY & FUELS
Volume 35, Issue 23, Pages 19849-19855Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c03328
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Funding
- Joint Center for Energy Storage Research, an Energy Innovation Hub - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- DOE Office of Science [AC02-06CH11357]
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This study investigates the solubility of saturated lithium bis(trifluoromethanesulfonyl)imide in seven different organic solvents and uses small/wide-angle X-ray scattering and Raman spectroscopy to study its global and local solvation structures. This method demonstrates the detection of liquid structures, facilitating the study of structure-performance relationships and the screening of new electrolytes.
Concentrated electrolytes are attracting significant attention because the solvation structures could stabilize the interface, encouraging novel electrolyte development for high-voltage and long-cycle-life batteries. Saturated electrolytes, which have the highest salt concentrations, have been rarely studied because of their shortcomings of high viscosity and low ionic conductivity. Nevertheless, the exciting solvation structure in saturated solution is still worth studying, significantly broadening the comprehensive understanding of the solvation processes. In this work, we investigate the saturated lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) dissolved in seven different organic solvents, including propylene carbonate (PC), tetrahydrofuran (THF), acetonitrile (ACN), dimethylformamide (DMF), 1,2-dimethoxyethane (DME), diethylene glycol dimethyl ether (Diglyme), and tetraethylene glycol dimethyl ether (Tetraglyme). The combined small/wide-angle X-ray scattering and Raman spectroscopy are employed to study the global and local solvation structure. This work demonstrates a method for detecting the structure of liquids, which will facilitate the study of structure-performance relationships and the screening of new electrolytes.
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