Abstract

Germanium (Ge), as a promising candidate for anodes of lithium ion batteries (LIB), however, undergoes a poor cycling performance due to its huge volume expansion and sluggish kinetics. Herein, we provide a facile method to synthesize the hybrid Ge/hollow rod-like carbon (HRC) nanocomposite. In this strategy, the ultrafine Ge nanoparticles are confined closely into the hollow carbon nanotubes, which provide adequate void space to alleviate the volume expansion and accelerate the filtration of electrolyte as well as the stable SEI formation. When used as the anode, the Ge/HRC nanocomposite exhibits an initial capacity of 2669 mA h g^–1 and maintains 677 mA h g^–1 after 300 cycles, suggesting its great potential application as the anode material for high-performance LIBs.

中文翻译：

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Ge/空心棒状碳纳米复合材料作为锂离子电池负极材料的简便合成

摘要

然而，锗 (Ge) 作为锂离子电池 (LIB) 负极的有希望的候选材料，由于其巨大的体积膨胀和缓慢的动力学，其循环性能较差。在此，我们提供了一种合成混合锗/空心棒状碳 (HRC) 纳米复合材料的简便方法。在该策略中，超细锗纳米粒子被紧密地限制在​​中空碳纳米管中，这提供了足够的空隙空间以减轻体积膨胀并加速电解质的过滤以及稳定的 SEI 形成。当用作负极时，Ge/HRC 纳米复合材料的初始容量为 2669 mA hg ^–1，并在 300 次循环后保持 677 mA hg ^–1，表明其作为高性能 LIB 负极材料的巨大应用潜力。