Due to the high reactivity between the lithium metal and traditional organic liquid electrolyte, the reaction of lithium metal electrode is usually uneven and there are also unexpected side reactions. Therefore, construction of a stable solid electrolyte interface (SEI) is highly essential to improve the performance of lithium metal anode. Herein, a sandwich-like gel polymer electrolyte (GPE) is accurately prepared by in-situ polymerization of Polyacrylonitrile (PAN) nanofiber membrane with trihydroxymethylpropyl trimethylacrylate (TMPTMA) and 1,6-hexanediol diacrylate (HDDA). The resulting GPE with a tightly cross-linked gel skeleton exhibits high ionic conductivity and electrochemical window of 5.6 V versus Li/Li⁺. In particular, the pretreatment of Li metal anode can improve the interfacial wettability, and the synergy of the chemically pretreated Li metal anode surface and the GPE can electrochemically in situ generate SEI with compositionally stable and fluorine-rich inorganic components. Owing to these unique advantages, the interfacial compatibility between the GPE and lithium metal is greatly improved. Meanwhile, the formed SEI can inhibit the formation of lithium dendrites, and decomposition of GPE would be alleviated. The assembled Li-FEC|GPE|LiFePO₄ full cell shows a high initial discharge capacity of 157.1 mA h g⁻¹, and maintains a capacity retention of 92.3% after 100 cycles at 0.2C.

由于锂金属与传统有机液体电解质之间的高反应性，锂金属电极的反应通常是不均匀的，并且还会出现意想不到的副反应。因此，构建稳定的固体电解质界面（SEI）对于提高锂金属负极的性能至关重要。在此，通过聚丙烯腈（PAN）纳米纤维膜与三甲基丙烯酸三羟甲基丙酯（TMPTMA）和1,6-己二醇二丙烯酸酯（HDDA）的原位聚合，准确地制备了三明治状凝胶聚合物电解质（GPE ）。所得 GPE 具有紧密交联的凝胶骨架，与Li/Li ^{+相比，具有高离子电导率和 5.6 V 的电化学窗口}. 特别是锂金属负极的预处理可以提高界面润湿性，化学预处理的锂金属负极表面和GPE的协同作用可以原位电化学生成具有组成稳定和富氟无机组分的SEI。由于这些独特的优势，GPE与锂金属之间的界面相容性大大提高。同时，所形成的SEI可以抑制锂枝晶的形成，从而减轻GPE的分解。组装后的Li-FEC|GPE|LiFePO ₄全电池显示出157.1 mAh g ^-1的高初始放电容量，并在0.2C下100次循环后保持92.3%的容量保持率。