In this study, we have developed a new ethylene oxide (EO)-based polymer electrolyte (PE) that contains fluoroalkyl moieties. The developed PE possesses high oxidative decomposition potential as well as adequate ionic conductivity (σ) and favorable mechanical properties for application to Li metal batteries. In particular, we designed a partially fluorinated copolymer, which is improved in conventional polyethylene oxide systems and could be used both as stable electrolyte matrix and electrode binder for high-voltage applications. The results indicated that the stabilization of the EO-based PE during the high-voltage operation of Li metal batteries was significantly improved by the introduction of a fluoroalkyl moiety via simple radical copolymerization. The synthesized copolymer exhibited satisfactory physical stability and unprecedented high oxidation decomposition voltage threshold, which exceeded 4.5 V. Moreover, the copolymer-based PEs presented moderate σ values (> 0.3 mS cm⁻¹ at 60 °C) and retained the intrinsic properties of the EO-based PE.

在这项研究中，我们开发了一种新的基于环氧乙烷（EO）的聚合物电解质（PE），其中包含氟代烷基部分。研制的PE具有高氧化分解电位和足够的离子电导率（σ）和适用于锂金属电池的良好机械性能。特别是，我们设计了一种部分氟化的共聚物，该共聚物在常规的聚环氧乙烷体系中得到了改进，可以同时用作稳定的电解质基质和用于高压应用的电极粘合剂。结果表明，通过简单的自由基共聚引入氟代烷基部分，可显着改善锂金属电池在高压运行过程中EO基PE的稳定性。合成的共聚物表现出令人满意的物理稳定性和前所未有的高氧化分解电压阈值（超过4.5 V）。此外，基于共聚物的PE表现出中等的σ值（> 0.3 mS cm ^-1 在60°C下）并保留了EO基PE的固有特性。