Sodium-ion batteries (SIBs) are promising candidates for large-scale energy storage applications. High-performance cathode material with high-energy density and long cycle life is of great interest. Here, an F-doped Nax[Formula: see text]Fy with layered-tunnel intergrowth structure is synthesized by a facile solid-state reaction method. The microstructure and composition of prepared material was confirmed by X-ray diffraction, field emission scanning electron microscope and transmission electron microscopy. The aim of the structure design is to combine the complementary features of high capacity from P2 phase and excellent structural stability from tunnel phase, as well as to improve rate performance by F doping. When investigated as high-rate and long-life cathode materials for Na-ion batteries, the layered-tunnel intergrowth structure exhibits synergistic effect including high discharge capacity (194.0[Formula: see text]mAh[Formula: see text][Formula: see text]), good rate capability (86[Formula: see text]mAh[Formula: see text][Formula: see text] at 15 C) as well as good cycling stability (81.2% capacity retention after 100 cycles). The as-prepared layered-tunnel intergrowth Nax[Formula: see text]Fy provides new insight into the development of intergrowth electrode materials and their application in rechargeable SIBs.

中文翻译：

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用于高性能钠离子电池的层状隧道结构阴极

钠离子电池（SIB）是大规模储能应用的有希望的候选者。具有高能量密度和长循环寿命的高性能正极材料备受关注。在这里，一个 F 掺杂的 NaX[公式：见正文]F是的采用简便的固态反应方法合成了具有层状隧道共生结构的材料。通过X射线衍射、场发射扫描电子显微镜和透射电子显微镜对制备材料的微观结构和组成进行了确认。结构设计的目的是结合P2相的高容量和隧道相的优异结构稳定性的互补特征，以及通过F掺杂提高倍率性能。当研究作为钠离子电池的高倍率和长寿命正极材料时，层状隧道共生结构表现出协同效应，包括高放电容量（194.0[公式：见正文]mAh[公式：见正文][公式：见text]），良好的倍率能力（86[公式：见文]mAh[公式：见文][公式：见文本] 在 15 C）以及良好的循环稳定性（100 次循环后容量保持率为 81.2%）。所制备的层状隧道共生 NaX[公式：见正文]F是的为共生电极材料的开发及其在可充电 SIB 中的应用提供了新的见解。