Polyanion-type Na₃V₂(PO₄)₂F₃ with high potential is regarded as a promising cathode material for sodium-ion batteries. However, it usually shows low electronic and ionic conductivity, further leading to inferior rate capability. Here well-dispersed Na₃V₂(PO₄)₂F₃ nanoparticles were anchored on reduced graphene oxide (rGO) via a facile precipitation process in an isopropanol–water mixed solvent. The Na₃V₂(PO₄)₂F₃@rGO composite exhibited apparently improved kinetics and further delivered high reversible capacity and outstanding high-rate performance. Furthermore, sodium-ion full cells composed of Na₃V₂(PO₄)₂F₃@rGO cathodes and hard carbon anodes presented high power density. This work offers a simple and scalable approach to boost the kinetics of polyanion-type cathodes for high-power alkali-ion batteries.

中文翻译：

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分散良好的Na3V2（PO4）2F3 @ rGO，具有改善的动力学，适用于大功率钠离子电池

具有高电势的聚阴离子型Na ₃ V ₂（PO ₄）₂ F ₃被认为是钠离子电池的有希望的正极材料。然而，它通常显示出低的电子和离子导电性，进一步导致速率能力较差。在这里，分散良好的Na ₃ V ₂（PO ₄）₂ F ₃纳米颗粒通过在异丙醇-水混合溶剂中的简便沉淀过程固定在还原的氧化石墨烯（rGO）上。Na ₃ V ₂（PO ₄）₂ F ₃rrGO复合材料表现出明显改善的动力学性能，并进一步提供了高可逆容量和出色的高速率性能。此外，由Na ₃ V ₂（PO ₄）₂ F ₃ @rGO阴极和硬碳阳极组成的钠离子充满电池表现出高功率密度。这项工作提供了一种简单且可扩展的方法来提高用于大功率碱离子电池的聚阴离子型阴极的动力学。