Rapid progress of lithium‐ion batteries (LIBs) highly relies on high‐performance electrode materials. Herein, a novel nanocomposite of CoSn alloy with a multishell layer structure confined in 3D porous carbon is constructed through a facile freeze drying and annealing treatment method. The skillful design effectively relieves the volume expansion of the Sn‐based alloy and enhances the combination between CoSn and carbon. Profiting from the synergistic effect of the multibuffer structure alloy and cross‐linked porous carbon, CoSn@SnO_x/CoO_x@C displays high capacity (912.6 mA h g⁻¹ after 100 cycles at 0.1 A g⁻¹) and excellent cycling stability (almost no capacity decay at 10 A g⁻¹ after 1000 cycles) when used as anode for LIBs. The presence of Sn–O/Co–O bond makes the nanoalloy tightly pinned on the carbon substance and the structure stability of electrode material is improved significantly. Furthermore, the porous carbon with plentiful defects offers abundant room for the volume expansion of Sn and ensures fast transport of electrons/ions. Cyclic voltammogram (CV) curves under different scan rates reveal that the charge storage of the nanocomposite is controlled by pseudocapacitive and ion‐diffusion mechanisms. This facile fabrication strategy and unique structure design can be extended to other composite materials for energy storage devices.

中文翻译：

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用于超长寿命锂存储的多缓冲结构3D CoSn @ SnOx / CoOx @ C阳极材料的原位构建

锂离子电池（LIB）的快速发展高度依赖于高性能电极材料。在此，通过简便的冷冻干燥和退火处理方法，构建了具有封闭在3D多孔碳中的多壳层结构的CoSn合金的新型纳米复合材料。熟练的设计有效地缓解了Sn基合金的体积膨胀，并增强了CoSn和碳之间的结合。从多缓冲结构合金和交联的多孔质碳等的CoSn @ SnO的协同效应中获利_X / CoO的_X @C显示高容量（912.6毫安ħ克^-1，在100次循环后0.1 A克^-1）和优异的循环稳定性（在10 A g ^-1时几乎没有容量衰减1000次循环后）用作LIB的阳极。Sn-O / Co-O键的存在使纳米合金紧密固定在碳物质上，电极材料的结构稳定性得到了显着改善。此外，具有大量缺陷的多孔碳为Sn的体积膨胀提供了充足的空间，并确保了电子/离子的快速传输。不同扫描速率下的循环伏安曲线（CV）曲线表明，纳米复合材料的电荷存储受伪电容和离子扩散机制控制。这种简便的制造策略和独特的结构设计可以扩展到其他用于储能设备的复合材料。