<br>用于超稳定锂金属电池的熔喷布增强部分氟化固体聚合物电解质,Nano Energy

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用于超稳定锂金属电池的熔喷布增强部分氟化固体聚合物电解质
Nano Energy ( IF 16.8 ) Pub Date : 2023-11-07 , DOI: 10.1016/j.nanoen.2023.109075
Shengyu Qin , Zichen Wang , Yunxiao Ren , Yinuo Yu , Yixian Xiao , Jiajun Chen , Jianying Zhang , Shuoning Zhang , Chang Sun , Jiumei Xiao , Lanying Zhang , Wei Hu , Huai Yang

采用氟化固态聚合物电解质（SPE）已成为在锂金属上形成稳定的固体电解质界面（SEI）的一种有前途的策略，它可以调节循环过程中锂沉积的行为。然而，过度氟化单体的原位聚合存在聚合动力学弱和聚合度低的问题。在此，提出并通过紫外线固化合成了具有熔喷布增强的部分氟化SPE。由于熔喷布增强的机械性能和部分氟化策略优化的电化学性能，部分氟化熔喷布增强 SPE (PFMC-SPE) 的性能显着提高。 PFMC-SPE 具有优异的室温离子电导率 (1.0 mS cm−1) 和宽的电化学稳定性窗口（高达 5 V）。此外，Li//LiFePO4电池可以在1.0 C倍率下稳定工作超过750次循环，30℃下从141.2 mAh g−1到119.6 mAh g−1的容量保持率为84.7%。采用可靠且廉价的基于熔喷布的固态电解质隔膜和部分氟化策略在开发下一代超稳定固态锂电池方面非常有前景。

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A meltblown cloth reinforced partially fluorinated solid polymer electrolyte for ultrastable lithium metal batteries

Employing fluorinated solid-state polymer electrolytes (SPEs) has emerged as a promising strategy to form stable solid-electrolyte interphase (SEI) on Li metal, which can regulate the behavior of Li deposition during cycling. However, in-situ polymerization of excessively fluorinated monomers suffers from weak polymerization kinetics and a low degree of polymerization. Herein, a partially fluorinated SPEs with meltblown cloth reinforcement was proposed and synthesized via UV-curing. The partially fluorinated meltblown cloth reinforced SPE (PFMC-SPE) showed significantly improved performances due to the enhanced mechanical properties from meltblown cloth and optimized electrochemical performances from the partial fluorination strategy. The PFMC-SPE possesses both a superior room temperature ionic conductivity (1.0 mS cm−1) and a wide electrochemical stability window (up to 5 V). Furthermore, the Li//LiFePO4 cell can stably work for more than 750 cycles at 1.0 C rate with a capacities retention of 84.7% from 141.2 mAh g−1 to 119.6 mAh g−1 at 30 °C. Both employing the reliable and inexpensive meltblown cloth based separators for solid-state electrolytes and the partial fluorination strategy is very promising in developing next-generation ultrastable solid-state lithium batteries.

更新日期：2023-11-07

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