Abstract Here, we report a novel structure of vesicular Na3V2(PO4)2F3 (NVPF) and a highly connected network of NVPF@graphene nanosheets (GN) via a one-step hydrothermal method, which is reported for the first time. As cathode material for Sodium ion battery (SIB), NVPF@16%GN shows a high average discharge plateau at 3.8 V with reversible capacity of 111.1 and 67.4 mAh g−1 at 0.2C and 5C rate, respectively. The obviously improved electrochemical performance should be contributed to the formation of superior conductive network of vesicular NVPF active material combing with GN, supplying adequate and shortened passageway for electronic transport and sodium ion diffusion.

中文翻译：

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一步合成囊泡Na3V2(PO4)2F3和具有改进电化学性能的Na3V2(PO4)2F3@石墨烯纳米片网络作为钠离子电池正极材料

摘要 在这里，我们通过一步水热法报道了一种新型的囊泡 Na3V2(PO4)2F3 (NVPF) 结构和一个高度连接的 NVPF@石墨烯纳米片 (GN) 网络，这是首次报道。作为钠离子电池 (SIB) 的正极材料，NVPF@16%GN 在 3.8 V 时显示出高平均放电平台，在 0.2C 和 5C 倍率下的可逆容量分别为 111.1 和 67.4 mAh g-1。明显改善的电化学性能应有助于形成与 GN 结合的囊泡 NVPF 活性材料的优良导电网络，为电子传输和钠离子扩散提供充足和缩短的通道。