Microscopic Understanding of the Ionic Networks of “Water-in-Salt” Electrolytes
Abstract
“Water-in-salt” electrolytes with excellent electrochemical and physical properties have been extensively investigated. However, the structural understanding of the lithium bis(trifluoromethane sulfonyl)imide (LiTFSI) in water is still lacking. Here, we perform synchrotron X-ray scattering to systemically study the structural variation of TFSI anions in an aqueous solution under a variety of concentrations and temperatures. There are two different solvation structures in the solution: TFSI - solvated structure and TFSI - network. As the concentration increases, the TFSI - solvated structure gradually disappears while the TFSI - network gradually forms. Even at relatively low concentrations, the TFSI - network can be observed. Our experimental results show that these two structures can coexist at a particular concentration, and temperature changes will lead to one structure’s formation or disappearance. Also, the TFSI - network is the key to obtain a stable electrochemical window under relatively high temperatures.
- Authors:
-
[2];
[1];
[1];
[4];
[2];
[5]
- Department of Chemistry and Biochemistry, Northern Illinois University, USA
- Materials Science Division, Argonne National Laboratory, USA, Joint Center for Energy Storage Research, Argonne National Laboratory, USA
- X-Ray Science Division, Argonne National Laboratory, USA
- Joint Center for Energy Storage Research, Argonne National Laboratory, USA, X-Ray Science Division, Argonne National Laboratory, USA
- Department of Chemistry and Biochemistry, Northern Illinois University, USA, Joint Center for Energy Storage Research, Argonne National Laboratory, USA, X-Ray Science Division, Argonne National Laboratory, USA
- Publication Date:
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1763764
- Resource Type:
- Published Article
- Journal Name:
- Energy Material Advances
- Additional Journal Information:
- Journal Name: Energy Material Advances Journal Volume: 2021; Journal ID: ISSN 2692-7640
- Publisher:
- American Association for the Advancement of Science (AAAS)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Liu, Xinyi, Yu, Zhou, Sarnello, Erik, Qian, Kun, Seifert, Soenke, Winans, Randall E., Cheng, Lei, and Li, Tao. Microscopic Understanding of the Ionic Networks of “Water-in-Salt” Electrolytes. United States: N. p., 2021.
Web. doi:10.34133/2021/7368420.
Liu, Xinyi, Yu, Zhou, Sarnello, Erik, Qian, Kun, Seifert, Soenke, Winans, Randall E., Cheng, Lei, & Li, Tao. Microscopic Understanding of the Ionic Networks of “Water-in-Salt” Electrolytes. United States. https://doi.org/10.34133/2021/7368420
Liu, Xinyi, Yu, Zhou, Sarnello, Erik, Qian, Kun, Seifert, Soenke, Winans, Randall E., Cheng, Lei, and Li, Tao. Thu .
"Microscopic Understanding of the Ionic Networks of “Water-in-Salt” Electrolytes". United States. https://doi.org/10.34133/2021/7368420.
@article{osti_1763764,
title = {Microscopic Understanding of the Ionic Networks of “Water-in-Salt” Electrolytes},
author = {Liu, Xinyi and Yu, Zhou and Sarnello, Erik and Qian, Kun and Seifert, Soenke and Winans, Randall E. and Cheng, Lei and Li, Tao},
abstractNote = {“Water-in-salt” electrolytes with excellent electrochemical and physical properties have been extensively investigated. However, the structural understanding of the lithium bis(trifluoromethane sulfonyl)imide (LiTFSI) in water is still lacking. Here, we perform synchrotron X-ray scattering to systemically study the structural variation of TFSI anions in an aqueous solution under a variety of concentrations and temperatures. There are two different solvation structures in the solution: TFSI - solvated structure and TFSI - network. As the concentration increases, the TFSI - solvated structure gradually disappears while the TFSI - network gradually forms. Even at relatively low concentrations, the TFSI - network can be observed. Our experimental results show that these two structures can coexist at a particular concentration, and temperature changes will lead to one structure’s formation or disappearance. Also, the TFSI - network is the key to obtain a stable electrochemical window under relatively high temperatures.},
doi = {10.34133/2021/7368420},
journal = {Energy Material Advances},
number = ,
volume = 2021,
place = {United States},
year = {Thu Jan 28 00:00:00 EST 2021},
month = {Thu Jan 28 00:00:00 EST 2021}
}
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