CNT@Fe3O4@C Coaxial Nanocables: One‐Pot,Additive‐Free Synthesis and Remarkable Lithium Storage Behavior |
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| Authors: | Dr Jianli Cheng Dr Bin Wang Prof?Dr Cheol‐Min Park Prof?Dr Yuping Wu Dr Hui Huang Dr Fude Nie |
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| Institution: | 1. New Materials R&D Center, Institute of Chemical Materials, China Academy of Engineering Physics, Chengdu, Sichuan 621900 (P.R. China), Fax:(+86)?816‐2544‐426;2. New Energy and Materials Laboratory (NEML), Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, No. 220, Handan Road, Shanghai 200433 (P.R. China), Fax: (+86)?21‐5566‐4223;3. School of Advanced Materials and System Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 730‐701 (Republic of Korea) |
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| Abstract: | By using carbon nanotubes (CNTs) as a shape template and glucose as a carbon precursor and structure‐directing agent, CNT@Fe3O4@C porous core/sheath coaxial nanocables have been synthesized by a simple one‐pot hydrothermal process. Neither a surfactant/ligand nor a CNT pretreatment is needed in the synthetic process. A possible growth mechanism governing the formation of this nanostructure is discussed. When used as an anode material of lithium‐ion batteries, the CNT@Fe3O4@C nanocables show significantly enhanced cycling performance, high rate capability, and high Coulombic efficiency compared with pure Fe2O3 particles and Fe3O4/CNT composites. The CNT@Fe3O4@C nanocables deliver a reversible capacity of 1290 mA h g?1 after 80 cycles at a current density of 200 mA g?1, and maintain a reversible capacity of 690 mA h g?1 after 200 cycles at a current density of 2000 mA g?1. The improved lithium storage behavior can be attributed to the synergistic effect of the high electronic conductivity support and the inner CNT/outer carbon buffering matrix. |
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| Keywords: | carbon coaxial nanocables electrochemistry lithium‐ion batteries nanotubes |
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