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首页> 外文期刊>RSC Advances >Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions
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Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions

机译：甘氨酸-锂盐等摩尔熔融溶剂化物，含碘化物/三碘化物氧化还原阴离子

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Room-temperature-fused Li salt solvates that exhibit ionic liquid-like behaviour can be formed using particular combinations of multidentate glymes and lithium salts bearing weakly coordinating anions, and are now deemed a subset of ionic liquids, viz. solvate ionic liquids (SILs). Herein, we report redox-active glyme–Li salt molten solvates consisting of tetraethyleneglycol ethylmethyl ether (G4Et) and lithium iodide/triiodide, [Li(G4Et)]I and [Li(G4Et)]I _(3) . The coordination structure of the complex ions and the thermal, transport, and electrochemical properties of these molten Li salt solvates were investigated to diagnose whether they can be categorized as SILs. [Li(G4Et)] ~(+) and I _(3) ~(?) were found to remain stable as discrete ions and exist as well-dissociated forms in the liquid state, indicating that [Li(G4Et)]I _(3) can be classified as a good SIL. This study also clarified that the I ~(?) and I _(3) ~(?) counter anions exhibit an electrochemical redox reaction in the highly concentrated molten Li salt solvates. The redox-active molten Li solvates were further studied as a highly concentrated catholyte for use in rechargeable semi-liquid lithium batteries. Although the cell constructed using [Li(G4Et)]I _(3) failed to charge after the initial discharge step, the cell containing [Li(G4Et)]I demonstrates reversible charge–discharge behaviour with a high volumetric energy density of 180 W h L ~(?1) based on the catholyte volume.
机译：可以使用多齿甘醇二甲醚和带有弱配位阴离子的锂盐的特定组合形成具有离子液体状行为的室温熔融锂盐溶剂化物，现在被认为是离子液体的子集。溶剂化物离子液体（SILs）。在这里，我们报道了由四甘醇乙基甲基醚（G4Et）和碘化锂/三碘化锂，[Li（G4Et）] I和[Li（G4Et）] I _（3）组成的具有氧化还原活性的甘氨酸锂盐熔融溶剂化物。研究了复合离子的配位结构以及这些熔融锂盐溶剂化物的热，输运和电化学性质，以诊断它们是否可以归类为SIL。发现[Li（G4Et）]〜（+）和I _（3）〜（？）作为离散离子保持稳定，并以液态形式良好解离存在，表明[Li（G4Et）] I _ （3）可以归类为良好的SIL。这项研究还阐明了I〜（？）和I_（3）〜（？）抗衡阴离子在高浓度熔融Li盐溶剂化物中表现出电化学氧化还原反应。进一步研究了氧化还原活性的熔融锂溶剂化物，它是用于可再充电半液体锂电池的高浓度阴极电解液。尽管使用[Li（G4Et）] I _（3）构造的电池在初始放电步骤后无法充电，但包含[Li（G4Et）] I的电池仍表现出可逆的充放电行为，其体积能量密度高达180 W h L〜（？1），基于阴极电解液的体积。

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