SnS has outstanding theoretical capacity and is a promising electrode material for sodium‐ion batteries. However, intrinsic low conductivity and huge volume changes upon sodium extraction/insertion limit its application. Herein, hierarchical hollow carbon spheres covered with S,N‐doped carbon‐coated SnS nanosheets synthesized by a multistep process are reported, including a hard sacrificial template, hydrothermal reaction, and annealing treatment. The prepared C@SnS@C samples are characterized by X‐ray diffraction, scanning electron microscopy, high‐resolution transmission electron microscopy, and X‐ray photoelectron spectroscopy. The nanosized SnS provides capacity; S,N‐doped carbon coating protects the integrated structure. Consequently, due to the compositional and structural merits, the optimized electrode has a high specific capacity of around 420 mAh g⁻¹ at 0.2 A g⁻¹, high rate performance (200 mAh g⁻¹ at 10 A g⁻¹), and good cycling stability with 95% (i.e., 305 mAh g⁻¹ at 0.5 A g⁻¹) of the initial capacitance after 100 cycles. Kinetic analyses reveal that a substantial capacitive contribution results in better rate performance of the C@SnS@C electrode.

中文翻译：

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多孔微球支撑的碳包覆SnS纳米片作为钠离子电池的负极材料

SnS具有出色的理论容量，是一种有前景的钠离子电池电极材料。然而，钠萃取/插入时固有的低电导率和巨大的体积变化限制了其应用。本文报道了通过多步法合成的覆盖有S，N掺杂碳包覆的SnS纳米片的分层空心碳球，包括硬牺牲模板，水热反应和退火处理。制备的C @ SnS @ C样品的特征在于X射线衍射，扫描电子显微镜，高分辨率透射电子显微镜和X射线光电子能谱。纳米级SnS可提供容量；S，N掺杂碳涂层可保护集成结构。因此，由于组成和结构上的优点，^-1 0.2 A G ^-1，高倍率性能（200毫安克^-1以10 A G ^-1），和良好的循环稳定性为95％（即，305毫安克^-1 0.5 A G ^-1）的100次循环后的初始电容。动力学分析表明，大量的电容贡献导致C @ SnS @ C电极具有更好的倍率性能。