Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei, 066004, China.
Guilin Electrical Equipment Scientific Research Institute Co. Ltd., Guilin, Guangxi, 541004, China.
Adv Sci (Weinh). 2022 Dec;9(35):e2204633. doi: 10.1002/advs.202204633. Epub 2022 Oct 26.
A viscous feature is beneficial for a solid electrolyte with respect to assembling solid-state batteries, which can change the solid-solid contacts from point to face. Here, novel halide-based deep eutectic solid electrolytes (DESEs) prepared by a facile ball milling method is reported. The mixture of halides triggers the deep eutectic phenomena by intermolecular interactions, leading to diverse morphologies and viscous statuses in terms of composition. Chemical- and micro-structure analyses via the cryogenic technique reveal that the LiCl and LiF nanoparticles are dispersed in an amorphous halide matrix, which endow freely mobile ions for fast ion transport. The optimized DESE thus achieves low activation energy and high ionic conductivity of 16 mS cm at room temperature, one of the highest values among various electrolytes so far. By integrating with the active materials to form a composite cathode, the viscous DESE yields a super-dense composite pellet which possesses intensively enhanced ionic conductivity in contrast to those formed by the sulfide-based electrolyte additives, demonstrating an attractive application prospect.
一种粘性特征有利于用于组装全固态电池的固体电解质，其可以将固-固接触从点接触改变为面接触。在此，报道了一种通过简便的球磨方法制备的新型卤化物基深共晶固态电解质（DES）。通过分子间相互作用，卤化物的混合物引发深共晶现象，从而在组成方面呈现出不同的形态和粘性状态。通过低温技术进行的化学和微观结构分析表明，LiCl 和 LiF 纳米颗粒分散在非晶卤化物基质中，为快速离子传输提供了可自由移动的离子。优化后的 DES 因此在室温下实现了低活化能和 16 mS cm 的高离子电导率，这是迄今为止各种电解质中最高的值之一。通过与活性材料形成复合阴极，粘性 DES 形成了超致密的复合颗粒，与由硫化物基电解质添加剂形成的颗粒相比，其离子电导率得到了显著增强，展示出有吸引力的应用前景。
