Dong Mengyang, Zhang Kuiyuan, Wan Xinyi, Wang Shilin, Fan Shuaikang, Ye ZhiZhen, Wang Yuqi, Yan Youguo, Peng Xinsheng
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, China.
Small. 2022 Apr;18(14):e2108026. doi: 10.1002/smll.202108026. Epub 2022 Feb 19.
Amid the burgeoning environmental concerns, electrochemical energy storage is of great demand, inspiring the rapid development of electrolytes. Quasi-liquid solid electrolytes (QLSEs) demonstrate exciting properties that combine high ionic conductivity and safety. Herein, a QLSE system is constructed by confining ionic liquids (ILs) into 2D materials-based membranes, which creates a subtle platform for the investigation of the nanoconfined ion transport process. The highest ionic conductivity increment of 506% can be observed when ILs are under nanoconfinement. Correlation of experimental results and simulation evidently prove the diffusion behaviors of ILs are remarkably accelerated when confined in nanochannels, ascribing from the promoted dissociation of ILs. Concurrently, nanoconfined ILs demonstrate a highly ordered distribution, lower interplay, and higher free volume compared against bulk systems. This work reveals and analyzes the phenomenon of ionic conductivity elevation in nanoconfined ILs, and offers inspiring opportunities to fabricate the highly stable and efficient QLSEs based on layered nanomaterials for energy storage applications.
在日益增长的环境问题背景下，电化学储能需求巨大，这推动了电解质的快速发展。准液体固体电解质（QLSEs）展现出结合了高离子电导率和安全性的令人兴奋的特性。在此，通过将离子液体（ILs）限制在二维材料基膜中构建了一个QLSE系统，这为研究纳米受限离子传输过程创造了一个精妙的平台。当离子液体处于纳米限域状态时，可观察到最高506%的离子电导率增量。实验结果与模拟的相关性明显证明，当限制在纳米通道中时，离子液体的扩散行为显著加速，这归因于离子液体解离的促进。同时，与本体系统相比，纳米受限离子液体表现出高度有序的分布、更低的相互作用和更高的自由体积。这项工作揭示并分析了纳米受限离子液体中离子电导率升高的现象，并为基于层状纳米材料制造用于储能应用的高度稳定和高效的QLSEs提供了鼓舞人心的机会。
