In recent years, development of all-solid-state batteries has become a promising approach to improve the safety of batteries. Herein, we report the preparation of a new composite polymer electrolyte (CPE) for use in all-solid-state sodium ion batteries. The CPE comprising of poly(methacrylate) (PMA), poly(ethylene glycol) (PEG), α-Al₂O₃ with acidic surface sites, and NaClO₄ exhibited high ionic conductivity (1.46 × 10^-4 S·cm^-1 at 70 °C), wide electrochemical stability window (4.5 V vs. Na⁺/Na), and good mechanical strength. With the introduction of the prepared CPE and Na₃V₂(PO₄)₃, the final all-solid-state sodium ion batteries showed good rate and cycle performance, with a high reversible capacity of 85 mAh·g^-1 when operated at 0.5 C (1 C = 118 mA·g^–1) and 94.1% capacity retention rate after 350 cycles at 70 °C. Our work provides a novel solid electrolyte for the development of all-solid-state sodium ion batteries.

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近年来，开发全固态电池已经成为提高电池安全性的有前途的方法。在此，我们报告了一种用于全固态钠离子电池的新型复合聚合物电解质（CPE）的制备。由聚（甲基丙烯酸酯）（PMA），聚乙二醇（PEG），具有酸性表面位点的α- Al ₂ O ₃和NaClO ₄组成的CPE表现出高离子电导率（1.46×10 ^-4 S·cm ^-1）在70°C下），宽的电化学稳定性窗口（相对于Na ⁺ / Na为4.5 V ）和良好的机械强度。随着制备的CPE和Na ₃ V ₂（PO ₄）的引入_{如图3所示}，最终的全固态钠离子电池在0.5 C（1 C = 118 mA·g ^–1）和94.1％的条件下工作时，具有良好的速率和循环性能，可逆容量高达85 mAh·g ^-1。在70°C下进行350次循环后的容量保持率。我们的工作为全固态钠离子电池的开发提供了一种新型的固体电解质。

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