| Autor: |
Xinyi Liu, Zhou Yu, Erik Sarnello, Kun Qian, Soenke Seifert, Randall E. Winans, Lei Cheng, Tao Li |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Energy Material Advances, Vol 2021 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2692-7640 |
| DOI: |
10.34133/2021/7368420 |
| Popis: |
“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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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