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Applied surface science v.433, 2018년, pp.428 - 436   SCI SCIE
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In-situ grown CNTs modified SiO2/C composites as anode with improved cycling stability and rate capability for lithium storage

Wang, Siqi (School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China ) ; Zhao, Naiqin (School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China ) ; Shi, Chunsheng (School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China ) ; Liu, Enzuo (School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China ) ; He, Chunnian (School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China ) ; He, Fang (School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China ) ; Ma, Liying (School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functiona ) ;
  • 초록  

    Abstract Silica (SiO 2 ) is regarded as one of the most promising anode materials for lithium ion batteries owing to its high theoretical specific capacity, relatively low operation potentials, abundance, environmental benignity and low cost. However, the low intrinsic electrical conductivity and large volume change of SiO 2 during the discharge/charge cycles usually results in poor electrochemical performance. In this work, carbon nanotubes (CNTs) modified SiO 2 /C composites have been fabricated through an in-situ chemical vapor deposition method. The results show that the electrical conductivity of the SiO 2 /C/CNTs is visibly enhanced through a robust connection between the CNTs and SiO 2 /C particles. Compared with the pristine SiO 2 and SiO 2 /C composites, the SiO 2 /C/CNTs composites display a high initial capacity of 1267.2mAhg −1 . Besides, an excellent cycling stability with the capacity of 315.7mAhg −1 is achieved after 1000th cycles at a rate of 1Ag −1 . The significantly improved electrochemical properties of the SiO 2 /C/CNTs composites are mainly attributed to the formation of three dimensional CNT networks in the SiO 2 /C substrate, which can not only shorten the Li-ion diffusion path but also relieve the volume change during the lithium-ion insertion/extraction processes. Highlights SiO 2 /C/CNTs composites were fabricated via an in-situ CVD method. SiO 2 /C/CNTs electrode exhibited an excellent long life cycling stability. Three dimensional CNTs networks formed in the SiO 2 /C/CNTs composites. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Lithium ion batteries .   In-situ synthesis .   Chemical vapor deposition .   Carbon nanotubes .   SiO2/C/CNTs composites.  

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