Abstract A novel ZrO2-reinforced nanofibrous membrane for sodium-ion batteries was synthesized via fabricating a ZrO2-reinforced layer on the surface of the modified cellulose acetate membrane (MCA) by a new and simple in-situ chemical precipitation method. Upon the rational design, the ZrO2-reinforced nanofibrous membranes exhibit high chemical stability and excellent wettability (a decreased contact angle from 26.8° to 7.4°) in electrolytes. Moreover, the ZrO2-reinforced nanofibrous membranes also show no distinct dimensional change after being kept at 250 °C for 30 min and high tensile strength up to 1.15 MPa. Compared to that of the MCA membrane (1.61 mS cm−1), the ZrO2@MCA-0.5h (immersed in a ZrO(NO3)2 solution for 0.5 h) exhibits a high ionic conductivity of 2.23 mS cm−1. Additionally, the cell with the ZrO2@MCA-0.5h displays a high discharge capacity of 224.8 mAh g−1 at 0.5 C, which are higher than those of the MCA membrane (156.1 mAh g−1). Meanwhile, the rate performance of the cells assembled with the ZrO2-reinforced nanofibrous membranes, especially with the ZrO2@MCA-0.5h membrane，are also better than that of the MCA. All the above improvements can be attributed to the presence of the continuous-phase ZrO2 reinforcement layer fabricated on the surface of the MCA membrane, which forms a strong self-adhesive structure among fibers to enhance mechanical strength and has a good affinity for the electrolyte to obtain high ionic conductivity.

中文翻译：

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基于醋酸纤维素纳米纤维和 ZrO2 增强层的新型钠离子电池膜

摘要 通过一种新的、简单的原位化学沉淀法，在改性醋酸纤维素膜（MCA）的表面制备了ZrO2增强层，合成了一种用于钠离子电池的新型ZrO2增强纳米纤维膜。经过合理设计，ZrO2 增强纳米纤维膜在电解质中表现出高化学稳定性和优异的润湿性（接触角从 26.8° 降低到 7.4°）。此外，ZrO2 增强的纳米纤维膜在 250°C 保持 30 分钟和高达 1.15 MPa 的高拉伸强度后也没有显示出明显的尺寸变化。与 MCA 膜 (1.61 mS cm-1) 相比，ZrO2@MCA-0.5h（浸入 ZrO(NO3)2 溶液 0.5 小时）表现出 2.23 mS cm-1 的高离子电导率。此外，带有 ZrO2@MCA-0 的电池。5h 在 0.5 C 下显示出 224.8 mAh g-1 的高放电容量，高于 MCA 膜的放电容量（156.1 mAh g-1）。同时，用ZrO2增强纳米纤维膜组装的电池，尤其是用ZrO2@MCA-0.5h膜组装的电池的倍率性能也优于MCA。上述所有改进都归功于在 MCA 膜表面制造的连续相 ZrO2 增强层的存在，它在纤维之间形成强自粘结构以提高机械强度，并对电解质具有良好的亲和力。获得高离子电导率。特别是使用 ZrO2@MCA-0.5h 膜，也优于 MCA。上述所有改进都归功于在 MCA 膜表面制造的连续相 ZrO2 增强层的存在，它在纤维之间形成强自粘结构以提高机械强度，并对电解质具有良好的亲和力。获得高离子电导率。特别是使用 ZrO2@MCA-0.5h 膜，也优于 MCA。上述所有改进都归功于在 MCA 膜表面制造的连续相 ZrO2 增强层的存在，该层在纤维之间形成强自粘结构以提高机械强度，并对电解质具有良好的亲和力。获得高离子电导率。