Carbon and aluminum oxide co-coated Na₃V₂(PO₄)₂F₃ cathode material has been successfully prepared via a wet chemistry method. The effects of the hybrid layer coating of C and Al₂O₃ on crystalline structure, morphology and electrochemical performance have been investigated. It is found that C and Al₂O₃ co-coating can stabilize the structure and improve the conductivity of NVPF. As a cathode material for sodium-ion batteries, the co-coated NVPF electrode shows a significant enhancement in rate capability and cycling performance, i.e., compared with bare NVPF, C-coated NVPF and Al₂O₃-coated NVPF, the NVPF/C-Al electrode delivers the highest capacity of 122.8 mAh g⁻¹ with a superior capacity retention ratio of 95.6% after 100 cycles at 1 C. This enhancement in cycling performance and rate capability can be ascribed to the protective effect of this hybrid coating layer of C and Al₂O₃ on NVPF from electrolyte attack and the facilitated electron/ion transmission caused by the hybrid coating layer. This modification method of co-coating with electronic conductor C and sodium ionic conductivity Al₂O₃ provides an effective way to improve the electrochemical properties of NVPF and other cathode materials with low electron/ion conductivity for sodium/lithium ion batteries.

已经通过湿化学方法成功地制备了碳和氧化铝共涂覆的Na ₃ V ₂（PO ₄）₂ F ₃阴极材料。研究了C和Al ₂ O ₃杂化层涂层对晶体结构，形貌和电化学性能的影响。发现C和Al ₂ O ₃共涂层可以稳定结构并提高NVPF的电导率。作为钠离子电池的正极材料，复合包覆的NVPF电极显示出倍率性能和循环性能的显着提高，即，与裸露的NVPF，C包覆的NVPF和Al ₂ O相比NVPF / C-Al电极由₃涂层NVPF制成，在1 C进行100次循环后可提供122.8 mAh g ^-1的最高容量，且容量保持率高达95.6％，这归因于循环性能和倍率性能的提高这种C和Al ₂ O ₃混合涂层对电解质侵​​蚀和混合涂层促进的电子/离子传输的保护作用对NVPF的保护作用。这种与电子导体C和钠离子电导率Al ₂ O ₃共同涂覆的改性方法为提高钠/锂离子电池的NVPF和其他具有低电子/离子电导率的阴极材料的电化学性能提供了有效的方法。