A lithiated organic nanofiber-reinforced composite polymer electrolyte enabling Li-ion conduction highways for solid-state lithium metal batteries,Journal of Materials Chemistry A

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A lithiated organic nanofiber-reinforced composite polymer electrolyte enabling Li-ion conduction highways for solid-state lithium metal batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-06 , DOI: 10.1039/d1ta06269g
Liying Tian ₁ , Ying Liu ₂ , Zhe Su ₁ , Yu Cao ₁ , Wanyu Zhang ₁ , Shan Yi ₁ , Yayun Zhang ₁ , Bo Niu ₁ , Panpan Dong ₃ , Donghui Long ₁

Affiliation

Solid polymer electrolytes (SPEs) with good flexibility and low cost are very promising for all-solid-state lithium metal batteries, but they suffer from the trade-off between ionic conductivity at room temperature and mechanical stability. Herein, a robust composite polymer electrolyte is prepared by thermal lamination of PEO polymer electrolyte films onto a lithiated organic nanofiber membrane (LOF), which could combine the merits of 3D Li-ion conduction highways for high ionic conductivity and nanofiber-reinforced networks for good mechanical properties. The intimate combination between the nanofibers and the PEO matrix endows the LOF-reinforced PEO composite (LOF-CPE) with homogeneous structure, leading to an enhanced ultimate tensile stress of 8.9 MPa. Furthermore, the introduction of the LOF significantly decreases the crystallinity of the polymer matrix, which accelerates polymer segmental motion. The well-designed LOF also constructs an interfacial percolation network with additional active Li⁺, resulting in the formation of high-speed Li-ion conduction pathways. Therefore, the as-prepared LOF-CPE delivers an excellent ionic conductivity of 7.41 × 10⁻⁵ S cm⁻¹ at 30 °C. While used as a SPE in LiFePO₄|Li solid-state batteries, the batteries exhibit good cyclability with a capacity retention of 82% after 500 cycles under 0.5C. This work provides a very promising strategy for solid polymer electrolytes to simultaneously achieve high ionic conductivity and excellent mechanical properties towards high-performance solid-state lithium metal batteries.

中文翻译：

一种锂化有机纳米纤维增强复合聚合物电解质，使固态锂金属电池的锂离子传导高速公路成为可能

具有良好柔韧性和低成本的固体聚合物电解质（SPE）对于全固态锂金属电池非常有前景，但它们在室温下的离子电导率和机械稳定性之间存在权衡。在此，通过将 PEO 聚合物电解质膜热层压到锂化有机纳米纤维膜 (LOF) 上制备了一种坚固的复合聚合物电解质，该膜可以结合 3D 锂离子传导高速公路的高离子电导率和纳米纤维增强网络的优点。机械性能。纳米纤维和 PEO 基体之间的紧密结合赋予 LOF 增强的 PEO 复合材料 (LOF-CPE) 以均匀的结构，从而提高了 8.9 MPa 的极限拉伸应力。此外，LOF 的引入显着降低了聚合物基体的结晶度，从而加速了聚合物的链段运动。精心设计的 LOF 还构建了一个具有额外活性锂的界面渗透网络⁺，导致形成高速锂离子传导通路。因此，所制备的 LOF-CPE在 30°C 下提供了 7.41 × 10^-5 S cm^-1的优异离子电导率。在用作 LiFePO₄ |Li 固态电池中的 SPE 时，该电池表现出良好的循环性能，在 0.5C 下循环 500 次后容量保持率为 82%。这项工作为固体聚合物电解质提供了一种非常有前景的策略，可以同时实现高离子电导率和高性能固态锂金属电池的优异机械性能。

更新日期：2021-10-19

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