The utilization of all-solid-state electrolytes is considered to be an effective way to enhance the safety performance of lithium metal batteries. However, the low ionic conductivity and poor interface compatibility greatly restrict the development of all-solid-state battery. In this study, a composite electrolyte combining the electrospun polyamide 6 (PA6) nanofiber membrane with hierarchical structure and the polyethylene oxide (PEO) polymer is investigated. The introduction of PA6 nanofiber membrane can effectively reduce the crystallinity of the polymer, so that the ionic conductivity of the electrolyte can be enhanced. Moreover, it is found that the presence of finely branched fibers in the hierarchical structure PA6 membrane allows the polar functional groups (C=O and N−H bonds) to be fully exposed, which provides sufficient functional sites for lithium ion transport and helps to regulate the uniform deposition of lithium metal. Moreover, the hierarchical structure can enhance the mechanical strength (9.2 MPa) of the electrolyte, thereby effectively improving the safety and cycle stability of the battery. The prepared Li/Li symmetric battery can be stably cycled for 1500 h under 0.3 mA cm⁻² and 60 °C. This study demonstrates that the prepared electrolyte has excellent application prospects in the next generation all-solid-state lithium metal batteries.

利用全固态电解质被认为是增强锂金属电池安全性能的有效方法。但是，低离子电导率和较差的界面相容性极大地限制了全固态电池的发展。在这项研究中，研究了一种复合电解质，该电解质结合了具有分层结构的电纺聚酰胺6（PA6）纳米纤维膜和聚环氧乙烷（PEO）聚合物。PA6纳米纤维膜的引入可以有效降低聚合物的结晶度，从而可以提高电解质的离子电导率。此外，发现在分层结构PA6膜中存在细支链的纤维可使极性官能团（C = O和N-H键）完全暴露，它为锂离子的运输提供了足够的功能位，并有助于调节锂金属的均匀沉积。此外，分层结构可以增强电解质的机械强度（9.2MPa），从而有效地提高电池的安全性和循环稳定性。制备的Li / Li对称电池可在0.3 mA cm下稳定循环1500 h⁻²和60°C。这项研究表明，所制备的电解质在下一代全固态锂金属电池中具有极好的应用前景。