Changchun Ai , Yilei Shu , Ziheng Zhao , Huijuan Guo , Shangqing Chen , Qun Yi
2025 Journal of Materials Chemistry A
Abstract
Poly (ethylene oxide) (PEO) composite solid-state electrolytes have been considered as promising candidate electrolytes for all-solid-state lithium batteries with high safety and excellent mechanical properties. However, the ionic conductivity of PEO-based electrolytes is usually low at room temperature, which limits their performance in practical applications. Moreover, the interfacial compatibility with high-voltage cathode materials remains a challenge despite the better compatibility with lithium metal anodes. The inevitable problem of lithium dendrite growth is also affecting the safety performance of this battery. Ionic liquids (ILs) with high conductivity and ionic mobility, enabling batteries to achieve a higher electrochemical window, offers a new platform for more environmentally friendly and sustainable all-solid-state lithium batteries. Considering that there has been a surge of exciting research activities in the field of PEO/ILs systems, this review is tended to summarize the mechanism of different kinds of ILs in PEO-based solid polymer electrolytes, and provide a comprehensive overview of the application of ILs in all-solid-state lithium batteries from a view of fillers. Ultimately, this information is expected to guide the design and optimization of novel PEO/ILs systems with enhanced properties for real-world applications.
聚環氧乙烷（PEO）複合固态電解質因其高安全性和優異的機械性能，被認為是全固态锂離子電池的理想候選電解質。然而，基于PEO的電解質在室溫下的離子電導率通常較低，這限制了其在實際應用中的性能。此外，盡管其與锂金屬負極具有較好的兼容性，但與高壓正極材料的界面兼容性仍然是一個挑戰。锂枝晶生長這一不可避免的問題也影響着該類電池的安全性能。離子液體（ILs）因其高電導率和離子遷移率，能夠使電池實現更高的電化學窗口，為更環保、可持續的全固态锂離子電池提供了新的平台。鑒于近年來在PEO/ILs體系領域湧現了大量令人興奮的研究進展，本綜述旨在總結不同種類離子液體在PEO基固體聚合物電解質中的作用機制，并從填料的角度全面概述離子液體在全固态锂離子電池中的應用。最終，這些信息有望為設計和優化具有增強性能的新型PEO/ILs體系提供指導，以滿足實際應用需求。
