Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 116, Issue 36, Pages 11323-11331Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp307378j
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Funding
- Japan Science and Technology Agency (JST)
- New Energy and Industrial Technology Development Organization (NEDO) of Japan
- Grants-in-Aid for Scientific Research [23245046] Funding Source: KAKEN
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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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