Novel Phosphonium-Based Ionic Liquid Electrolytes for Battery Applications

In this study, we address the fundamental question of the physicochemical and electrochemical properties of phosphonium-based ionic liquids containing the counter-ions bis(trifluoromethanesulfonyl)imide ([TFSI]−) and bis(fluorosulfonyl)imide ([FSI]−). To clarify these structure–property as well as s...

Full description

Saved in:
Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-07, Vol.27 (15), p.4729
Main Authors: Hofmann, Andreas, Rauber, Daniel, Wang, Tzu-Ming, Hempelmann, Rolf, Kay, Christopher W. M., Hanemann, Thomas
Format: Article
Language:English
Subjects:
Alkali metals
Aluminum
Batteries
Chains
Conductivity
Electric cells
Electrochemical analysis
Electrochemistry
Electrolytes
Electrolytic cells
Energy storage
Flow characteristics
Flow stability
Investigations
ionic liquid
Ionic liquids
Ions
Lithium-ion batteries
Metals
phosphonium
Viscosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this study, we address the fundamental question of the physicochemical and electrochemical properties of phosphonium-based ionic liquids containing the counter-ions bis(trifluoromethanesulfonyl)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.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27154729