期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 30, 页码 14797-14804出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta04686g
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51202117]
- Natural Science Foundation of Beijing [2162037]
- Beijing Nova program [Z171100001117077]
- Beijing outstanding talent program [2015000020124G121]
- Fundamental Research Funds for the Central Universities [2014QJ02]
- State Key Laboratory of Coal Resources and Safe Mining [SKLCRSM16KFB04]
- Key Laboratory of Advanced Materials of Ministry of Education [2018AML03]
- Yue Qi Young Scholar Project of China University of Mining & Technology (Beijing) [2017QN17]
- Pengcheng Scholar Program of Shenzhen
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.
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