Abstract The design of a suitable separator is an effective approach to enhance the performance as well as the safety of a rechargeable battery. The conventional glass fiber separator has electrolyte leakage due to the random distribution of pores in the structure. The design of a gel polymer electrolyte with phosphorus containing compound is considered to be safer for the operation of a rechargeable sodium ion battery. Hence, we have developed a gel polymer using hydroxyapatite, a calcium phosphate-based compound in poly (vinylidene fluoride-hexafluoropropylene)-poly (butyl methacrylate) blend membrane by a simple solution casting technique. The developed membrane has an ionic conductivity of 1.086 × 10−3 S cm−1 with an electrochemical stability of up to 4.9 V, good porosity and electrolyte uptake, thereby making it a promising electrolyte to be used in a rechargeable sodium ion battery. To demonstrate its feasibility, the electrochemical properties of Na3V2(PO4)3/C are investigated using the prepared gel polymer electrolyte. The sodium ion cell using gel polymer electrolyte exhibits a specific capacity of 97 mAh g−1 at 4 C which is about 33.5% enhancement in specific capacity when compared to the cell with the conventional glass fiber membrane. This study illustrates the feasibility of using gel polymer electrolyte as a replacement to the existing glass fiber separator.

中文翻译：

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准固态钠离子电池多孔磷酸钙基凝胶聚合物电解质的设计

摘要 设计合适的隔膜是提高可充电电池性能和安全性的有效途径。传统的玻璃纤维隔板由于结构中孔隙的随机分布而存在电解液泄漏。具有含磷化合物的凝胶聚合物电解质的设计被认为对于可充电钠离子电池的操作更安全。因此，我们通过简单的溶液浇铸技术开发了一种使用羟基磷灰石的凝胶聚合物，羟基磷灰石是聚（偏二氟乙烯-六氟丙烯）-聚（甲基丙烯酸丁酯）共混膜中的一种磷酸钙基化合物。所开发的膜的离子电导率为 1.086 × 10−3 S cm−1，电化学稳定性高达 4.9 V，具有良好的孔隙率和电解质吸收率，从而使其成为用于可充电钠离子电池的有前途的电解质。为了证明其可行性，使用制备的凝胶聚合物电解质研究了 Na3V2(PO4)3/C 的电化学性能。使用凝胶聚合物电解质的钠离子电池在 4 C 下表现出 97 mAh g-1 的比容量，与具有传统玻璃纤维膜的电池相比，比容量提高了约 33.5%。该研究说明了使用凝胶聚合物电解质替代现有玻璃纤维隔膜的可行性。使用凝胶聚合物电解质的钠离子电池在 4 C 下表现出 97 mAh g-1 的比容量，与具有传统玻璃纤维膜的电池相比，比容量提高了约 33.5%。该研究说明了使用凝胶聚合物电解质替代现有玻璃纤维隔膜的可行性。使用凝胶聚合物电解质的钠离子电池在 4 C 下表现出 97 mAh g-1 的比容量，与具有传统玻璃纤维膜的电池相比，比容量提高了约 33.5%。该研究说明了使用凝胶聚合物电解质替代现有玻璃纤维隔膜的可行性。