Junyan Tang, En Chen, Dehua Wang, Wen Qin, Siyu Fang, Ting Xu, Junjie Liu, Mi Tang, Zhengbang Wang
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引用次数: 0
摘要
为锂金属电池构建兼具低可燃性和高离子电导率的聚合物基固体电解质仍然是一项巨大的挑战，但却是非常理想的。在此，我们报告了一系列纤维增强型聚（离子液体）固体电解质的制备方法，该方法是将离子液体单体（IL）和聚（乙二醇）二丙烯酸酯（PEGDA）单元以不同比例原位共聚在聚丙烯腈（PAN）纤维膜内。这种 PAN/Poly-IL-PEGDA 复合电解质具有良好的低可燃性，这是由于所采用的 IL 单元具有出色的耐火特性。此外，值得注意的是，经过优化的 PAN/Poly-IL-PEGDA-1 电解质还具有高密度结构、低厚度（31 μm）、高离子电导率（30 °C 时为 0.32 mS cm-1）和宽电化学窗口（高达 4.8 V）。因此，使用这种电解质的 LiFePO4//Li 和 NCM//Li 全电池都具有出色的速率能力和循环稳定性。这项研究为制备高性能锂金属电池所需的低可燃性、高导电性复合聚合物电解质提供了一种简单的策略。
A Fiber-Reinforced Poly(ionic liquid) Solid Electrolyte with Low Flammability and High Conductivity for High-Performance Lithium-Metal Batteries.
Construction of polymer-based solid electrolytes with both low flammability and high ionic conductivity for lithium-metal batteries is still a great challenge but highly desirable. Herein, we report on a series of fiber-reinforced poly(ionic liquid) solid electrolytes prepared through an in situ copolymerization of ionic liquid monomers (IL) and poly(ethylene glycol) diacrylate (PEGDA) units with different ratios inside a polyacrylonitrile (PAN) fiber membrane. Such PAN/Poly-IL-PEGDA composite electrolytes demonstrate promising low flammability due to the excellent fire-resistant feature of the employed IL units. Moreover, it is remarkable to see that the optimized PAN/Poly-IL-PEGDA-1 electrolyte also exhibits highly dense structure with low thickness (31 μm), high ionic conductivity (0.32 mS cm-1 at 30 °C), and wide electrochemical window (up to 4.8 V). As a result, both LiFePO4//Li and NCM//Li full cells with such an electrolyte exhibit both excellent rate capability and cycling stability. This study provides a simple strategy for preparing composite polymer electrolytes with low flammability and high conductivity for high-performance lithium-metal batteries.
期刊介绍：
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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