Understanding Solvation Behavior of the Saturated Electrolytes with Small/Wide-Angle X-ray Scattering and Raman Spectroscopy
- Kun QianKun QianDepartment of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, United StatesMore by Kun Qian
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- Soenke SeifertSoenke SeifertX-ray Science Division and Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Soenke Seifert
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- Randall E. Winans*Randall E. Winans*E-mail: [email protected]X-ray Science Division and Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Randall E. Winans
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- Tao Li*Tao Li*E-mail: [email protected]Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, United StatesX-ray Science Division and Joint Center for Energy Storage Research, Argonne National Laboratory, Lemont, Illinois 60439, United StatesMore by Tao Li
Abstract
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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