Porous SiO_x anodes for Li‐ion batteries with a high volumetric energy density are desired. Herein, carbon‐coated SiO_x –SnO₂ hollow spheres are prepared by facile one‐pot high‐temperature annealing without using any template. During the process, SiO_x is obtained through Sn reduction with the assistance of C. In the composite, the SiO_x hollow spheres have a thin wall, the small SnO₂ particles are uniformly imbedded in the sphere wall, and the SiO_x –SnO₂ hollow spheres are coated by cross‐linked carbon. As an anode, the composite has a large volumetric capacity (1339 mAh cm⁻³ at 0.1 A g⁻¹), a high gravimetric capacity (1030 mAh g⁻¹ at 0.1 A g⁻¹), and a good cyclic stability (after 100 cycles, 90% capacity is retained compared with that of the second cycle at 0.5 A g⁻¹). The high capacity and good cycle stability result from the superior structure of the composite. Furthermore, the thin wall of the sphere can timely release a large expanded volume during lithiation, and the conformal carbon also provides a framework to maintain the structural integrity and facilitate the formation of a stable solid–electrolyte interface.

中文翻译：

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SiOx–SnO2 @ C空心球的无罐无模板交联合成，作为锂离子电池的高容量阳极

需要用于锂离子电池的具有高体积能量密度的多孔SiO _x阳极。在此，通过简便的单锅高温退火而不使用任何模板来制备碳包覆的SiO _x -SnO ₂空心球。在此过程中，通过C的辅助作用，通过Sn的还原获得SiO _x。在复合材料中，SiO _x中空球的壁薄，小SnO ₂颗粒均匀地嵌入球壁，而SiO _x -SnO _2个空心球被交联碳覆盖。作为阳极，复合材料的体积容量大（在0.1 A g ^-1时为1339 mAh cm ^-3），高重量容量（1030毫安克^-1 0.1 A G ^-1），和良好的循环稳定性（100次循环后，90％容量与所述第二周期的在相比0.5 A克保留^-1）。高容量和良好的循环稳定性归因于复合材料的优越结构。此外，球体的薄壁可以在锂化过程中及时释放出较大的膨胀体积，并且保形碳还提供了一个框架，以保持结构完整性并促进形成稳定的固体-电解质界面。