The safety issues and lower energy density of the lithium metal batteries are the two main challenges that hinder their applications in the fields of electric vehicles and portable devices. In this work, the semi-interpenetrated polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP)-based gel polymer electrolyte was synthesized through UV-curing method by employing the ethoxylated trimethylolpropane triacrylate (ETPTA) monomer. The semi-interpenetrating networks formed by polymerization of ETPTA and the high liquid absorption rate of the PVdF-HFP impart the as-prepared electrolyte with a high room temperature ionic conductivity of 3.17 × 10⁻³ s cm⁻¹ and a high mechanical strength of 3.46 MPa. LiFePO₄ was selected as cathode materials, and the active material loading of the cathode is about 4.2 mg cm⁻². The electrolyte shows superior long-term cycling properties (127 mAh g⁻¹ after 200 cycles at 0.5 C), excellent rate performance (113 mAh g⁻¹ at 1 C, 80 mAh g⁻¹ at 2 C, and the discharge capacity of 135 mAh g⁻¹ can be restored when the rate goes back to 0.1 C) as well as good ability to inhibit the growth of lithium dendrite (about 150 h). The facile synthesis strategy and great electrochemical performance of the electrolyte make it a potential candidate for lithium metal batteries.

锂金属电池的安全问题和较低的能量密度是阻碍其在电动汽车和便携式设备领域中应用的两个主要挑战。在这项工作中，采用乙氧基化三羟甲基丙烷三丙烯酸酯（ETPTA）单体通过紫外线固化法合成了半互穿的聚偏二氟乙烯-六氟丙烯（PVdF-HFP）基凝胶聚合物电解质。由ETPTA聚合形成的半互穿网络和PVdF-HFP的高液体吸收率使所制备的电解质具有3.17×10 ^-3  s cm ^-1的高室温离子电导率和高的机械强度。 3.46兆帕。磷酸铁锂₄选择作为负极材料的正极，正极的活性材料负载为约4.2mg cm ^-2。该电解质表现出优异的长期循环性能（在0.5 C下200次循环后为127 mAh g ^-1），出色的倍率性能（在1 C下为113 mAh g ^-1，在2 C下为80 mAh g ^-1以及放电容量）。当速率回到0.1 C时，可以恢复135 mAh g ^-1，并且具有良好的抑制锂枝晶生长的能力（约150 h）。电解质的简便合成策略和出色的电化学性能使其成为锂金属电池的潜在候选者。