Revealing the role and working mechanism of confined ionic liquids in solid polymer composite electrolytes

作     者：Haiman Hu Jiajia Li Yue Wu Wenhao Fang Haitao Zhang Xiaoyan Ji 

作者机构：Energy EngineeringDivision of Energy ScienceLulea University of Technology97187 LuledSweden Beijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeiing 100190China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2024年第99卷第12期

页      面：110-119页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：support from European Union’s Horizon 2020 research,innovation programme under grant agreement No. 958174, Vinnova (Swedish Governmental Agency for Innovation Systems) the financial support from the LTU CREATERNITY program the J. Gust Richert Foundation the Swedish Energy Agency,STINT (CH2019-8287),and Bio4energy the National Natural Science Foundation of China (No.U23A20122) 

主　　题：Ionic liquid Confinement Ionic transport pathway Lithium-ion transport kinetics Lithium metal batteries 

摘      要：The confined ionic liquid(IL) in solid polymer composite electrolytes(SCPEs) can improve the performance of lithium metal batteries. However, the impact/role and working mechanism of confined IL in SCPEs remain ambiguous. Herein, IL was immobilized on SiO_(2)(SiO_(2)@IL-C) and then used to prepare the confined SCPEs together with LiTFSI and PEO to study the impacts of confined-IL on the properties and performance of electrolytes and reveal the Li+transport mechanism. The results show that, compared to the IL-unconfined SCPE, the IL-confined ones exhibit better performance of electrolytes and cells, such as higher ionic conductivity, higher t+Li, and wider electrochemical windows, as well as more stable cycle performance, due to the increased dissociation degree of lithium salt and enlarged polymer amorphousness. The finite-element/molecular-dynamics simulations suggest that the IL confined on the SiO_(2) provided an additional Li+transport pathway(Li+→ SiO_(2)@IL-C) that can accelerate ion transfer and alleviate lithium dendrites, leading to ultrastable stripping/plating cycling over 1900 h for the Li/SCPEs/Li symmetric cells. This study demonstrates that IL-confinement is an effective strategy for the intelligent approach of high-performance lithium metal batteries.