Novel Phosphonium-Based Ionic Liquid Electrolytes for Battery Applications
Hofmann, Andreas
1; Rauber, Daniel; Wang, Tzu-Ming 2; Hempelmann, Rolf; Kay, Christopher W. M.; Hanemann, Thomas 1
1 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)
1; Rauber, Daniel; Wang, Tzu-Ming 2; Hempelmann, Rolf; Kay, Christopher W. M.; Hanemann, Thomas 11 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)
Abstract (englisch):
In this study, we address the fundamental question of the physicochemical and electrochemical
properties of phosphonium-based ionic liquids containing the counter-ions bis(trifluoromethanesul
fonyl)imide ([TFSI]) and bis(fluorosulfonyl)imide ([FSI]). To clarify these structure–property as
well as structure–activity relationships, trimethyl-based alkyl- and ether-containing phosphonium
ILs were systematically synthesized, and their properties, namely density, flow characteristics, alkali
metal compatibility, oxidative stability, aluminum corrosivity as well as their use in Li-ion cells
were examined comprehensively. The variable moiety on the phosphonium cation exhibited a chain
length of four and five, respectively. The properties were discussed as a function of the side chain,
counter-ion and salt addition ([Li][TFSI] or [Li][FSI]). High stability coupled with good flow characteristics
were found for the phosphonium IL [P1114][TFSI] and the mixture [P1114][TFSI] + [Li][TFSI],
respectively.
properties of phosphonium-based ionic liquids containing the counter-ions bis(trifluoromethanesul
fonyl)imide ([TFSI]) and bis(fluorosulfonyl)imide ([FSI]). To clarify these structure–property as
well as structure–activity relationships, trimethyl-based alkyl- and ether-containing phosphonium
ILs were systematically synthesized, and their properties, namely density, flow characteristics, alkali
metal compatibility, oxidative stability, aluminum corrosivity as well as their use in Li-ion cells
were examined comprehensively. The variable moiety on the phosphonium cation exhibited a chain
length of four and five, respectively. The properties were discussed as a function of the side chain,
counter-ion and salt addition ([Li][TFSI] or [Li][FSI]). High stability coupled with good flow characteristics
were found for the phosphonium IL [P1114][TFSI] and the mixture [P1114][TFSI] + [Li][TFSI],
respectively.
| Zugehörige Institution(en) am KIT | Post Lithium Storage (POLiS) Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsjahr | 2022 |
| Sprache | Englisch |
| Identifikator | ISSN: 1420-3049 KITopen-ID: 1000148906 |
| HGF-Programm | 38.02.01 (POF IV, LK 01) Fundamentals and Materials |
| Erschienen in | Molecules |
| Verlag | MDPI |
| Band | 27 |
| Heft | 15 |
| Seiten | Art.Nr.: 4729 |
| Bemerkung zur Veröffentlichung | Gefördert durch den KIT-Publikationsfonds |
| Vorab online veröffentlicht am | 24.07.2022 |
| Schlagwörter | ionic liquid; phosphonium; electrochemistry; batteries |
| Nachgewiesen in | Dimensions Web of Science Scopus |