Silicon (Si) has been broadly investigated as a promising anode in lithium-ion batteries (LIBs). However, there is still a problem that the alloying reactions of Si and Li often cause structural failures and rapid degradation in capacity of the electrode. Herein, an in-situ encapsulation of Si nanoparticles forming metal-organic-framework (MOF) derived carbon shells have been developed to improve the performance and retain the structural integrity of the electrode. Using this strategy, a compact and robust interface was ensured between the Si nanoparticles and carbon shell while also reducing the unnecessary exposing areas simultaneously. Moreover, the pores in the MOF-derived carbon shells offered good channels for Li-ion penetration and diffusion. The resulted composite electrode exhibited excellent electrochemical performance and delivered a capacity of 3714 mAh g⁻¹ at 200 mA g⁻¹, and an outstanding reversible capacity of 820 mA h g⁻¹ at 5000 mA g⁻¹ even after 1000 cycles, Direct comparison between the encapsulated Si and naked Si revealed the significance of the MOF-derived carbon shells and its great potential for the next-generation high capacity LIBs.

硅（Si）已被广泛研究为锂离子电池（LIBs）中有希望的阳极。但是，仍然存在Si和Li的合金化反应经常引起结构破坏和电极容量的迅速降低的问题。在此，已经开发了形成金属-有机框架（MOF）衍生的碳壳的Si纳米颗粒的原位包封以改善性能并保持电极的结构完整性。使用该策略，可以确保在Si纳米颗粒和碳壳之间形成紧凑而坚固的界面，同时还可以减少不必要的暴露区域。此外，MOF衍生的碳壳中的孔为锂离子的渗透和扩散提供了良好的通道。^-1以200mA克^-1，和820毫安汞柱的杰出可逆容量^-1在5000毫安克^-1甚至1000次循环后，包封的Si和裸硅之间的直接比较揭示了MOF来源的碳壳的意义及其在下一代高容量LIB中的巨大潜力。