Issue 38, 2014

Silylated quaternary ammonium salts – ionic liquids with hydrophobic cations

Abstract

Another class of ionic liquids was obtained by a combination of bis(perfluoroalkylsulfonyl)amide anions and O-silylated choline like cations. The protection of the hydrophilic hydroxyl group of hydroxyalkyl substituted quaternary ammonium salts with a trialkylsilyl group changes cations' properties from hydrophilic to hydrophobic; both constituents (cations and anions) of resulting ionic liquids have a hydrophobic character. Their essential physical and chemical properties were investigated. Moderate viscosity and conductivity of ionic liquids follow the Vogel-Tammann-Fulcher model of their dependency on the temperature. All ionic liquids show similar electrochemical stability as anticipated from CV measurements. The cathodic stability for most compounds is below 0 V vs. Li/Li+, and anodic decomposition starts typically over more than 5 V vs. Li/Li+. These properties suggest that these ionic liquids have potential for the preparation of electrolytes for high voltage lithium batteries.

Graphical abstract: Silylated quaternary ammonium salts – ionic liquids with hydrophobic cations

Supplementary files

Article information

Article type
Paper
Submitted
28 May 2014
Accepted
30 Jul 2014
First published
21 Aug 2014

J. Mater. Chem. A, 2014,2, 15964-15971

Silylated quaternary ammonium salts – ionic liquids with hydrophobic cations

M. Koželj, A. Guerfi and K. Zaghib, J. Mater. Chem. A, 2014, 2, 15964 DOI: 10.1039/C4TA02675F

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