Na(VO)(PO)F (NVPOF) is considered as a promising cathode candidate for sodium-ion batteries (SIBs) owing to the high theoretical capacity and operating voltage. However, the challenges of its rate capability and cyclability limit its widespread application. Herein, the reduced graphene oxide decorated NVPOF microrods (NVPOF@G) are successfully synthesized by a facile hydrothermal-induced self-assembly procedure. It is found that the graphene oxides added act as a crystal nucleation growth regulator and provide rapid Na and electron transport in the electrodes. The prepared NVPOF@G microrods exhibit a superior rate capability of 82.2 mAh g at 50 C (fast discharge in 72 s) as well as considerable long-term cycle stability with a capacity retention of 87.6% over 1000 cycles at 0.5 C. Even at 50 °C, the NVPOF@G still achieves a high reversible capacity of 109.4 mAh g with a capacity retention of 87.7% after 1000 cycles. This microrod structure shows superior structural stability, even at high temperatures (50 °C). Such a cathode incorporates the benefits of batteries and supercapacitors. This work gives a way to fabricate microrod-structure phosphate-based materials for commercial applications in high-performance SIBs.

中文翻译：

---

使用自嵌入 3D 导电互穿框架中的 Na3(VO)2(PO4)2F 微棒提高钠离子电池性能

Na(VO)(PO)F (NVPOF) 由于具有高理论容量和工作电压，被认为是钠离子电池（SIB）的有前途的正极候选材料。然而，其倍率性能和循环性能的挑战限制了其广泛应用。在此，通过简便的水热诱导自组装程序成功合成了还原氧化石墨烯装饰的 NVPOF 微棒（NVPOF@G）。研究发现，添加的氧化石墨烯充当晶体成核生长调节剂，并在电极中提供快速的钠和电子传输。所制备的 NVPOF@G 微棒在 50 C 下表现出 82.2 mAh g 的优异倍率性能（72 秒内快速放电），并且具有相当大的长期循环稳定性，在 0.5 C 下经过 1000 次循环后容量保持率为 87.6%。 50℃下，NVPOF@G仍实现109.4mAh g的高可逆容量，1000次循环后容量保持率为87.7%。即使在高温 (50 °C) 下，这种微棒结构也表现出卓越的结构稳定性。这种阴极结合了电池和超级电容器的优点。这项工作提供了一种制造微棒结构磷酸盐基材料的方法，用于高性能 SIB 的商业应用。