To alleviate the volume variation upon the silicon oxide during the lithium ion storage process and improve its cyclic stability as well as rate performance in the application of anode material in LIBs, a silicon oxide, carbon and carbon nanotube hybrid material with coaxial structure is developed here in a two-step manner. The formed Carbon-SiO₂@SiO₂@CNT coaxial nanotube material carries 644 mAh g⁻¹ stable capacity under 0.1 A g⁻¹ as the anode material in LIBs. After over 5000 operating cycles under 1 A g⁻¹, 242 mAh g⁻¹ reversible capacity is clearly demonstrated. The enhanced electrochemical performances can be mostly attributed to the inner carbon nanotube and outer carbon layer, both of which can relief the stress arising from the change of volume and improve the conductivity. The coaxial structure may also benefit to the lithium ions transportation.

为了减轻锂离子存储过程中氧化硅的体积变化并提高其循环稳定性以及在LIB中使用阳极材料时的速率性能，本文开发了具有同轴结构的氧化硅，碳和碳纳米管杂化材料分两步进行。形成的碳-SiO ₂ @SiO ₂ @CNT同轴纳米管材料在LIBs中作为阳极材料在0.1 A g ^-1下具有644 mAh g ^-1的稳定容量。在1 A g ^-1下经过超过5000个操作周期后，242 mAh g ^-1清楚地显示了可逆容量。增强的电化学性能主要归因于内部碳纳米管和外部碳层，两者都可以减轻体积变化引起的应力并提高电导率。同轴结构还可有益于锂离子的运输。