Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Articles
Redox Active Glyme-Li Salt Solvate Ionic Liquids Based on Tetrabromoferrate(III)
Yuta KEMMIZAKIHiromori TSUTSUMIKazuhide UENO
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2018 Volume 86 Issue 2 Pages 46-51

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Abstract

An equimolar mixture of oligoether solvents, glymes, and Li salt yields a new subclass of ionic liquids (ILs), referred to as solvate ILs, when using an appropriate combination of glyme and Li salt. In this paper a triglyme-Li tetrabromoferrate complex [Li(G3)][FeBr4] is prepared by combining a crystalline glyme-Li salt complex, [Li(G3)]Br, and an iron(III) bromide Lewis acid, FeBr3, to demonstrate a solvate IL comprised entirely of complex ions. [Li(G3)][FeBr4] is characterized in terms of thermal properties, coordination structure, and transport properties. This study reveals that the melting point of [Li(G3)][FeBr4] is lower than 100°C and that highly dissociated complex ions, [Li(G3)]+ and [FeBr4], are present both in the molten state and in polar acetonitrile solutions. [Li(G3)][FeBr4] is thus deemed a good solvate IL. The reversible redox property of the [FeBr4]/[FeBr4]2− couple is exploited for the catholytes of rechargeable lithium batteries. The catholyte based on this redox active solvate IL exhibits a highly reversible charge-discharge behavior.

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© 2018 The Electrochemical Society of Japan
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