The development of new liquid and solid state electrolytes is paramount for the advancement of electrochemical devices such as lithium batteries and solar cells. Ionic liquids have shown great promise in both these applications. Here we demonstrate the use of phosphonium cations with small alkyl chain substituents, in combination with a range of different anions, to produce a variety of new halide free ionic liquids that are fluid, conductive and with sufficient thermal stability for a range of electrochemical applications. Walden plot analysis of the new phosphonium ionic liquids shows that these can be classed as “good” ionic liquids, with low degrees of ion pairing and/or aggregation, and the lithium deposition and stripping from one of these ionic liquids has been demonstrated. Furthermore, for the first time phosphonium cations have been used to form a range of organic ionic plastic crystals. These materials can show significant ionic conductivity in the solid state and thus are of great interest as potential solid-state electrolyte materials.
开发新的液态和固态电解质对于
锂电池和太阳能电池等电
化学设备的发展至关重要。
离子液体在这两种应用中都大有可为。在这里,我们展示了使用带有小烷基链取代基的
鏻阳离子,结合一系列不同的阴离子,生产出各种新型无卤
离子液体,它们具有流动性、导电性和足够的热稳定性,可用于一系列电
化学应用。对新型
鏻离子液体进行的瓦尔登图分析表明,这些
离子液体可归类为 "良好 "
离子液体,离子配对和/或聚集程度较低,其中一种
离子液体的
锂沉积和剥离也已得到证实。此外,
鏻阳离子首次被用于形成一系列有机离子塑料晶体。这些材料可在固态下显示出显著的离子导电性,因此作为潜在的固态电解质材料具有极大的吸引力。