The fabrication of flexible polymer electrolytes (PEs) which possess simultaneously high thermal stability, robust mechanical strength, and high ionic conductivity is very challenging for lithium (Li) batteries. Herein, cellulose-based PE is fabricated via a Li salt-induced surface-initiated radical polymerization of polyethylene glycol methyl ether acrylate (PEGA). The polymerization of PEGA is catalyzed by various Li salts, such as Li perchlorate (LiClO₄), bis(trifluoromethane)sulfonimide Li (LiTFSI), Li difluoro(oxalato)borate (LiDFOB), and LiClO₄/LiDFOB, which also serve as charge transfer carriers in PEs. The Li salt can be used as the catalyst to promote the cleavage of C–Br bond on the surface of Br-modified cellulose, and then initiate the polymerization of PEGA. The PE obtained from the dual salt (LiClO₄/LiDFOB)-induced radical polymerization system exhibits high ionic conductivity of 3.5 × 10⁻⁵ S cm⁻¹ at 30 °C, good thermal stability (up to 240 °C), and wide electrochemical stability window (5.0 V vs. Li/Li⁺). Moreover, Li/PE/Li symmetric cells show good interfacial stability between PE and Li foil and the assembled Li/PE/LiFePO₄ cells possess 150 mA h g⁻¹ at 0.1C. Li salt-induced surface-initiated polymerization provides a simple and efficient method for fabricating PE for high-performance Li metal batteries (LMBs).

同时具有高热稳定性，鲁棒的机械强度和高离子电导率的柔性聚合物电解质（PE）的制造对于锂（Li）电池来说是非常具有挑战性的。在此，基于纤维素的PE通过聚乙二醇甲基醚丙烯酸酯（PEGA）的Li盐诱导的表面引发的自由基聚合来制备。各种锂盐（例如高氯酸锂（LiClO ₄），双（三氟甲烷）磺酰亚胺锂（LiTFSI），二氟（草酸酯）硼酸锂（LiDFOB）和LiClO ₄）都可以催化PEGA的聚合。/ LiDFOB，它也充当PE中的电荷转移载体。锂盐可以用作催化剂，促进Br修饰的纤维素表面C-Br键的裂解，然后引发PEGA的聚合。由双盐（LiClO ₄ / LiDFOB）引发的自由基聚合体系获得的PE在30°C时具有3.5×10 ^-5  S cm ^-1的高离子电导率，良好的热稳定性（高达240°C），并且具有宽广的电导率。电化学稳定性窗口（5.0 V vs. Li / Li ⁺）。此外，Li / PE / Li对称电池在PE和Li箔之间显示出良好的界面稳定性，组装的Li / PE / LiFePO ₄电池具有150 mA h g ^-1在0.1C下。锂盐诱导的表面引发聚合为高性能锂金属电池（LMB）的PE的制备提供了一种简单有效的方法。