Due to its highest theoretical capacity and low discharge potential, silicon (Si) has attracted increasing attention as one of the most promising anodes for lithium-ion batteries. However, the practical application of Si-based materials is still hindered by rapid capacity fading caused by the huge volume changes of Si during cycling. Herein, a flexible carbon nanotube (CNT)-constructed carbonaceous fibers network anchored with N-doped carbon-coated Si nanoparticles (C/Si/CNTs) has been fabricated. CNTs were sequentially bound together to form a fibrous structure and further crosslinked into a network by electrospinning method. The rational designed conductive network improves the electron transport, buffers the volume changes of inner Si nanoparticles and exhibits excellent mechanical flexibility. Utilized as flexible anodes for lithium-ion batteries, the C/Si/CNTs electrode delivers a high reversible capacity of 696.8 mA h g⁻¹ after 50 cycles at 100 mA g⁻¹, and achieves 473.1 mA h g⁻¹ at 500 mA g⁻¹ (based on the total mass of the electrode). This approach provides a promising strategy to develop high performance silicon-based anode materials for next-generation lithium-ion batteries.

中文翻译：

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将 Si/N 掺杂的碳复合材料包裹在 CNT 增强的纤维网络中作为高性能锂离子电池的柔性阳极

由于其最高的理论容量和低放电电位，硅（Si）作为最有前途的锂离子电池负极之一越来越受到关注。然而，Si基材料的实际应用仍然受到循环过程中Si的巨大体积变化引起的快速容量衰减的阻碍。在这里，已经制造了一种柔性碳纳米管 (CNT) 构造的碳质纤维网络，其锚定有 N 掺杂的碳包覆硅纳米粒子 (C/Si/CNTs)。碳纳米管依次结合在一起形成纤维结构，并通过静电纺丝方法进一步交联成网络。合理设计的导电网络改善了电子传输，缓冲了内部硅纳米粒子的体积变化，并表现出优异的机械柔韧性。^-1之后50个循环以100mA克^-1，并且实现473.1毫安汞柱^-1以500mA克^-1（基于电极的总质量）。这种方法为开发用于下一代锂离子电池的高性能硅基负极材料提供了一种很有前景的策略。