首页|Revealing the role and working mechanism of confined ionic liquids in solid polymer composite electrolytes
Revealing the role and working mechanism of confined ionic liquids in solid polymer composite electrolytes
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The confined ionic liquid(IL)in solid polymer composite electrolytes(SCPEs)can improve the perfor-mance of lithium metal batteries.However,the impact/role and working mechanism of confined IL in SCPEs remain ambiguous.Herein,IL was immobilized on SiO2(SiO2@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 tLi+,and wider electrochemical windows,as well as more stable cycle performance,due to the increased dissociation degree of lithium salt and enlarged polymer amorphous-ness.The finite-element/molecular-dynamics simulations suggest that the IL confined on the SiO2 pro-vided an additional Li+transport pathway(Li+→ SiO2@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.
Ionic liquidConfinementIonic transport pathwayLithium-ion transport kineticsLithium metal batteries
Haiman Hu、Jiajia Li、Yue Wu、Wenhao Fang、Haitao Zhang、Xiaoyan Ji
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Energy Engineering,Division of Energy Science,Luleå University of Technology,97187 Luleå,Sweden
Beijing Key Laboratory of Ionic Liquids Clean Process,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China
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