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Glyme–Lithium Salt Equimolar Molten Mixtures: Concentrated Solutions or Solvate Ionic Liquids?

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Ueno, Kazuhide, Yoshida, Kazuki, Tsuchiya, Mizuho, Tachikawa, Naoki, Dokko, Kaoru, Watanabe, Masayoshi·2012·The Journal of Physical Chemistry B

Abstract

To demonstrate a new family of ionic liquids (ILs), i.e., "solvate" ionic liquids, the properties (thermal, transport, and electrochemical properties, Lewis basicity, and ionicity) of equimolar molten mixtures of glymes (triglyme (G3) and tetraglyme (G4)) and nine different lithium salts (LiX) were investigated. By exploring the anion-dependent properties and comparing them with the reported data on common aprotic ILs, two different classes of liquid regimes, i.e., ordinary concentrated solutions and "solvate" ILs, were found in the glyme-Li salt equimolar mixtures ([Li(glyme)]X) depending on the anionic structures. The class a given [Li(glyme)]X belonged to was governed by competitive interactions between the glymes and Li cations and between the counteranions (X) and Li cations. [Li(glyme)]X with weakly Lewis basic anions can form long-lived [Li(glyme)](+) complex cations. Thus, they behaved as typical ionic liquids. The lithium "solvate" ILs based on [Li(glyme)]X have many desirable properties for lithium-conducting electrolytes, including high ionicity, a high lithium transference number, high Li cation concentration, and high oxidative stability, in addition to the common properties of ionic liquids. The concept of "solvate" ionic liquids can be utilized in an unlimited number of combinations of other metal salts and ligands, and will thus open a new field of research on ionic liquids.

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Metadata

Authors
Ueno, K., Yoshida, K., Tsuchiya, M., Tachikawa, N., Dokko, K., & Watanabe, M.
Venue
The Journal of Physical Chemistry B
Published
2012-08-31
Volume
116
Issue
36
Pages
11323-11331
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
OpenAlex
W2330494931
Cited by
418
References
1
FWCI
8.29
Type
journal article
Language
en
Open access
hybrid

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