意大利米兰理工大学Elie Paillard团队报道阳离子辅助锂离子传输用于高性能PEO基三元固体聚合物电解质。相关研究成果于2021年3月1日发表在国际顶尖学术期刊《德国应用化学》。

N-烷基-N-烷基吡咯烷基离子液体（ILs）是一种用于降低聚环氧乙烷（PEO）基固体聚合物电解质（SPE）的工作温度的很有前途的非易燃增塑剂，但它们在锂离子传输方面存在局限性，比如锂离子的转移数要低得多。

因此以环氧乙烷为取代基，制备了具有7个重复单元的吡咯烷吡啶阳离子。研究人员结合实验表征和模拟发现，阳离子的溶解特性使得锂离子在SPE中的传输比烷基取代类似物更快。这不仅通过加速PEO本身的传导模式来进行，而且通过使新的传导模式与锂的溶剂化通过一个单一的离子连接。与锂金属结合的良好界面性能导致锂金属聚合物电池的性能显著提高。

附：英文原文

Title: Cation‐Assisted Lithium Ion Transport for High Performance PEO?based Ternary Solid Polymer Electrolytes

Author: Jaschar Atik, Diddo Diddens, Johannes Helmut Thienenkamp, Gunther Brunklaus, Martin Winter, Elie Paillard

Issue&Volume: 2021-03-01

Abstract: N   ‐alkyl‐  N  ‐alkyl pyrrolidinium‐based ionic liquids (ILs) are promising candidates as non‐flammable plasticizers for lowering the operation temperature of poly(ethylene oxide) (PEO)‐based solid polymer electrolytes (SPEs), but they present limitations in terms of lithium ion transport such as a much lower lithium transference number. Thus, a pyrrolidinium cation was prepared with an oligo(ethylene oxide) substituent with seven repeating units. We show, by a combination of experimental characterizations and simulations, that the cation’s solvating properties allow faster lithium ion transport than alkylsubstituted analogues when incorporated in SPEs. This proceeds not only by accelerating PEO own conduction modes, but also  via  the enabling new conduction modes linked to the solvation of lithium by a single IL cation. This, combined with favorable interfacial properties  vs  . lithium metal, leads to significantly improved performance on lithium metal polymer batteries.

DOI: 10.1002/anie.202016716

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202016716