Sodium-ion batteries (SIBs) have been increasingly attracting attention as a sustainable alternative to lithium-ion batteries for scalable energy storage. The key to advanced SIBs relies heavily upon the development of reliable anodes. In this respect, Bi₂S₃ has been extensively investigated because of its high capacity, tailorable morphology, and low cost. However, the common practices of incorporating carbon species to enhance the electrical conductivity and accommodate the volume change of Bi₂S₃ anodes so as to boost their durability for Na storage have met with limited success. Herein, we report a simple method to realize the encapsulation of Bi₂S₃ nanorods within three-dimensional, nitrogen-doped graphene (3DNG) frameworks, targeting flexible and active composite anodes for SIBs. The Bi₂S₃/3DNG composites displayed outstanding Na storage behavior with a high reversible capacity (649 mAh·g^–1 at 62.5 mA·g^–1) and favorable durability (307 and 200 mAh·g^–1 after 100 cycles at 125 and 312.5 mA·g^–1, respectively). In-depth characterization by in situ X-ray diffraction revealed that the intriguing Na storage process of Bi₂S₃ was based upon a reversible reaction. Furthermore, a full, flexible SIB cell with Na_0.4MnO₂ cathode and as-prepared composite anode was successfully assembled, and holds a great promise for next-generation, wearable energy storage applications.

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钠离子电池（SIB）作为可持续发展的锂离子电池替代品，已成为可扩展的能量存储设备，因此越来越受到人们的关注。高级SIB的关键很大程度上取决于可靠阳极的开发。在这方面，Bi ₂ S ₃由于其高容量，可定制的形态和低成本而被广泛研究。然而，掺入碳物质以增强电导率并适应Bi ₂ S ₃阳极的体积变化从而提高其在Na储存中的耐久性的常规做法取得了有限的成功。在此，我们报告了一种实现Bi ₂ S ₃包封的简单方法三维氮掺杂石墨烯（3DNG）框架内的纳米棒，其目标是SIB的柔性和活性复合阳极。铋₂ š ₃ / 3DNG复合材料显示具有高可逆容量优秀的Na存储行为（649毫安·克^-1在62.5毫安·克^-1）和良好的耐久性（307和200毫安·克^-1在125 100次循环后和312.5 mA·g ^–1分别）。通过原位X射线衍射的深入表征表明，有趣的Bi ₂ S ₃ Na存储过程基于可逆反应。此外，具有Na _0.4 MnO ₂的完整，灵活的SIB电池 阴极和已制备的复合阳极已成功组装，对下一代可穿戴式储能应用具有广阔的前景。

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