Sodium vanadium fluorophosphate (NaVPO₄F) has got greater scientific attention as cathode material for sodium-ion batteries owing to its open framework structure, elevated redox potential, and high theoretical capacity. In this article, the designing and development of carbon-decorated NaVPO₄F (NaVPO₄F@C) composites were carried out via facile solution technique, followed by a solid-state reaction at different temperatures. XRD results indicate that all the NaVPO₄F@C samples are indexed to the well-crystallized structure with monoclinic crystal. HRTEM images showed a uniform thin layer of carbon coated on the NaVPO₄F particle surface. Among the fabricated samples, the NaVPO₄F@C annealed at 750 °C (NaVPO₄F@C-750 °C) exhibits the best sodium storage performances i.e., highest specific capacity, considerable rate capacity and cycling stability. The NaVPO₄F@C-750 °C delivers a high discharge capacity of 116.2 mAh g⁻¹ at 0.1 C, which is around 81.3% of the theoretical capacity (143 mAh g⁻¹). Furthermore, it may indicate an elevated reversible capacity (104.3 mAh g⁻¹ at 2 C) post 300 cycles with a lower capacity fading ratio of around 0.012% per cycle.

氟磷酸钒钠（NaVPO ₄ F）由于其开放的骨架结构、较高的氧化还原电位和较高的理论容量，作为钠离子电池的正极材料受到了更多的科学关注。在本文中，碳修饰的 NaVPO ₄ F (NaVPO ₄ F@C) 复合材料的设计和开发是通过简易溶液技术进行的，然后在不同温度下进行固相反应。XRD 结果表明，所有 NaVPO ₄ F@C 样品均具有单斜晶系的良好结晶结构。HRTEM 图像显示在 NaVPO ₄ F 颗粒表面上有一层均匀的碳薄层。在制备的样品中，NaVPO ₄在 750 °C 下退火的 F@C (NaVPO ₄ F@C-750 °C) 表现出最好的钠存储性能，即最高的比容量、可观的倍率容量和循环稳定性。NaVPO ₄ F@C-750 °C在 0.1 C下提供 116.2 mAh g ^-1的高放电容量，约为理论容量（143 mAh g ^-1）的81.3% 。此外，这可能表明在 300 次循环后可逆容量升高（2 C时为104.3 mAh g ^-1），每个循环的容量衰减率较低，约为 0.012%。