Functionalized polypropylene separator coated with polyether/polyester blend for high-performance lithium metal batteries

Energy Materials Pub Date : 2024-05-21 DOI:10.20517/energymater.2023.129

Weixin Ye, Zixin Fan, Xingping Zhou, Zhigang Xue

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Abstract

Commercial polyolefin separators used in lithium metal batteries (LMBs) have the disadvantages of insufficient thermal stability and poor wettability with electrolytes, which causes bad safety and battery performance. Poly(ε-caprolactone) (PCL)-based electrolytes have drawn widespread attention in the field of polymer electrolytes owing to their electrochemical stability and high lithium-ion transference number. This work proposes a strategy of functionalizing commercial polypropylene (PP) separator coated by blending PCL (M w ~ 50,000) and poly(ethylene oxide) (PEO, M V ~ 600,000). Compared to commercial PP separators, PP-blended PEO60w/PCL5w separators possess better wettability with electrolytes and electrochemical performances. The initial discharge specific capacity of LiFePO4-based LMBs assembled with PP-blended PEO60w/PCL5w separators reaches 144 mAh g-1 (1C) and 103 mAh g-1 (5C) at room temperature, respectively. Notably, Li/PP-blended PEO60w/PCL5w/LiFePO4 shows an improved capacity retention rate of 77% after 800 cycles, confirming that the functionalized separator with coated PEO/PCL blend has great potential for application in the field of LMBs.

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用于高性能锂金属电池的涂有聚醚/聚酯混合物的功能化聚丙烯隔膜

锂金属电池（LMB）中使用的商用聚烯烃隔膜存在热稳定性不足、与电解质的润湿性差等缺点，导致安全性和电池性能不佳。聚(ε-己内酯)（PCL）基电解质因其电化学稳定性和高锂离子传输数而在聚合物电解质领域受到广泛关注。本研究提出了一种将 PCL（M w ~ 50,000 ）和聚环氧乙烷（PEO，M V ~ 600,000 ）混合涂覆在商用聚丙烯（PP）隔膜上的功能化策略。与商用聚丙烯分离器相比，聚丙烯混合 PEO60w/PCL5w 分离器具有更好的电解质润湿性和电化学性能。在室温条件下，使用混合 PP 的 PEO60w/PCL5w 分离剂组装的基于磷酸铁锂的 LMB 的初始放电比容量分别达到 144 mAh g-1 （1C）和 103 mAh g-1 （5C）。值得注意的是，锂/PP 混合 PEO60w/PCL5w/LiFePO4 在 800 次循环后的容量保持率提高了 77%，这证实了涂有 PEO/PCL 混合物的功能化隔膜在 LMB 领域具有巨大的应用潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Energy Materials

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