Insulated polymer host and lithium salt need to be separately dissolved into organic solvents prior to assembly of lithium batteries, implying a large usage of organic solvents and the consequent disadvantages of poor thermal stability, flammability, and explosibility of the end products. Herein, a new generation of thermotropic ionic liquid crystalline lithium salt (LiBIB) with potential bilayer fast ion-conductive tunnels, having functionalities of both lithium salt and polymer host or electrolyte, is successfully synthesized. Molecular structure, thermal stability, ionic conductivity, electrochemical stability, and ion-conductive mechanism of the LiBIB are extensively assessed. The obtained LiBIB shows typical behaviors of both ionic liquid and liquid crystal. Melt point at 43 °C, much lower than that of traditional lithium salts like LiClO₄ and LiPF₆, and clear point of the LiBIB at 83 °C are both detected. Solid LiBIB salt shows better ionic conductivity (3 × 10⁻³ S cm⁻¹) and electrochemical stability at room temperature in comparison with those of traditional lithium salts. Time-resolved and perturbation-correlation moving window 2D-COR FTIR results indicate that the high ionic conductivity of the LiBIB is mainly originated from the formation of fast ion-conductive tunnels, implying a promising application in solvent-free Li-ion batteries.

组装锂电池之前，需要将绝缘的聚合物主体和锂盐分别溶解在有机溶剂中，这意味着有机溶剂的大量使用以及随之而来的缺点是最终产品的热稳定性，可燃性和易爆性差。在此，成功地合成了具有潜在的双层快速离子导电隧道的新一代热致性离子液晶锂盐（LiBIB），该隧道具有锂盐和聚合物主体或电解质的功能。广泛评估了LiBIB的分子结构，热稳定性，离子电导率，电化学稳定性和离子导电机理。所获得的LiBIB显示出离子液体和液晶的典型行为。熔点为43°C，远低于传统锂盐（如LiClO）的熔点_图4和LiPF ₆以及在83℃下都检测到LiBIB的透明点。与传统的锂盐相比，固态LiBIB盐在室温下具有更好的离子电导率（3×10 ^-3  S cm ^-1）和电化学稳定性。时间分辨和摄动相关的移动窗口2D-COR FTIR结果表明，LiBIB的高离子电导率主要源自快速离子导电隧道的形成，这意味着在无溶剂锂离子电池中的应用前景广阔。