Sandwich-like CNTs/Si/C nanotubes as high performance anode materials for lithium-ion batteries
Sandwich-like CNTs/Si/C nanotubes as high performance anode materials for lithium-ion batteries
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DOI：
10.1039/c8ta04686g
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发表时间：
2018-08-14
影响因子：
11.9
通讯作者：
Lin, Zhiqun
中科院分区：
文献类型：
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作者：
Liu, Ruiping;Shen, Chao;Lin, Zhiqun
采用水热法成功制备了同轴硅包覆碳纳米管（CNTs/Si）。通过在碳表面再包覆一层碳，得到了三明治状碳包覆CNTs/Si。所制备的材料作为锂离子电池的负极材料显示出上级的循环性能，其电流密度高达500 mA g（-1），在充电/放电过程中没有可观察到的结构变化。此外，在1000次循环后，其可逆放电容量高达1508.5mAh·g（-1）。在1Ag（-1）和2Ag（-1）的较高电流密度下，CNTs/Si/C纳米管也表现出理想的循环性能，可逆放电容量分别为1216.6mAhg（-1）和932.2mAhg（-1）。碳纳米管/硅/碳复合材料的中空管状结构不仅减小了循环过程中的体积变化，而且有利于锂离子和电子的传输，并稳定了SEI层。这些结果表明，类碳纳米管/硅/碳纳米管是一种有前途的锂离子电池负极材料。
Co-axial silicon-coated carbon nanotubes (CNTs/Si) were successfully synthesized via a hydrothermal method. Sandwich-like carbon-coated CNTs/Si were obtained by an additional carbon coating. The as-prepared materials show superior cycling performance as anode materials in lithium ion batteries with a current density as high as 500 mA g(-1) with no observable structural changes during the charge/ discharge process. In addition, stable reversible discharge capacities as high as 1508.5 mA h g(-1) after 1000 cycles were obtained. At higher current densities of 1 A g(-1) and 2 A g(-1), the CNTs/Si/C nanotubes also showed ideal cycling performance with reversible discharge capacities of 1216.6 mA h g(-1) and 932.2 mA h g(-1), respectively. The sandwich-like hollow tube structure of CNTs/Si/C not only alleviates the volume change during cycling, but also facilitates Li-ion and electron transport, and stabilizes the SEI layer. These results suggest that sandwich-like CNTs/Si/C nanotubes are a promising anode material for lithium ion batteries.