Journal Article

FZJ-2018-04826

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Modified Imidazolium-Based Ionic Liquids With Improved Chemical Stability Against Lithium Metal

Schmitz, P. ; Kolek, M. ; Pyschik, M. ; Jalkanen, K. ; Nowak, S. ; Winter, M.FZJ* ; Bieker, P. (Corresponding author)

2017
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/slct.201701599

Abstract: Chemical instability against metallic lithium of imidazolium cation‐based ionic liquids (ILs) such as 1‐butyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide ([C4MIm]TFSI) has been reported in literature previously. In this work, modified imidazolium cation‐based ionic liquids are shown, in which the acidic proton at the C‐2 position of the imidazolium ring is replaced by methyl groups. 1‐butyl‐2,3‐dimethylimidazolium bis(trifluoromethanesulfonyl)imide ([C4MMIm]TFSI) and 1‐butyl‐2,3,4,5‐tetramethylimidazolium bis(trifluoromethanesulfonyl)imide ([C44MIm]TFSI) are found to prevent the formation of N‐heterocyclic carbenes and thus improve the electrochemical performance of electrolytes including these ILs. Furthermore, possible decomposition products of the modified imidazolium cations are characterized.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)

Appears in the scientific report 2018

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