Silicon is attracting considerable attention as an active anode material for advanced lithium-ion batteries due to its ultrahigh theoretical capacity. However, the reversible utilization of silicon-based anode materials is still hindered by the rapid capacity decay, as a consequence of the huge volume change of silicon during cycling. Herein, we use a Co-zeolitic imidazole framework (ZIF-67) to prepare silicon-wrapped nitrogen-doped carbon nanotubes ([email protected] CNTs) by controllable thermal pyrolysis. The as-prepared nanocomposites can effectively prevent pulverization and accommodate volume fluctuations of silicon during cycling. It can deliver a highly reversible capacity of 1100 mAh g^-1 even after 750 cycles at a current density of 1000 mA g^-1. As confirmed by an in situ transmission electron microscopy experiment, the remarkable electrochemical performance of [email protected] CNTs is attributed to the high electronic conductivity and flexibility of cross-linked N-doped CNTs network can act as a cushion to mitigate the mechanical stress and volume expansion. Furthermore, a full cell consisting of [email protected] CNTs anodes and LiFePO₄ cathodes is assembled, which can deliver a highly reversible capacity of 1264 mAh g^-1 as well as good cycling stability (>85% capacity retention) over 140 cycles at 1/4 C (1 C = 4000 mA g^-1) rate.

硅由于其超高的理论容量而作为高级锂离子电池的活性阳极材料引起了极大的关注。然而，由于循环期间硅的巨大体积变化的结果，快速的容量衰减仍然阻碍了硅基负极材料的可逆利用。在这里，我们使用共沸石咪唑骨架（ZIF-67）通过可控的热解制备硅包裹的氮掺杂碳纳米管（[受电子邮件保护的碳纳米管]）。所制备的纳米复合材料可有效防止粉化并适应循环过程中硅的体积波动。即使在750次循环后，在1000 mA g ^-1的电流密度下，它也可以提供1100 mAh g ^-1的高度可逆容量。经证实在原位透射电子显微镜实验中，[受电子邮件保护的] CNT出色的电化学性能归因于高电子电导率和交联N掺杂CNTs网络的柔韧性可以充当缓冲垫，以减轻机械应力和体积膨胀。此外，组装了一个由[电子邮件保护] CNTs阳极和LiFePO ₄阴极组成的完整电池，它在140°C的温度下可在140次循环中提供1264 mAh g ^-1的高度可逆容量以及良好的循环稳定性（大于85％的容量保持率）。 1/4 C（1 C = 4000 mA g ^-1）速率。