Preparation and Electrochemical Performance of Si@C/SiO x as Anode Material for Lithium-ion Batteries

【Author】

YANG Tao;LI Xiao;TIAN Xiao-Dong;SONG Yan;LIU Zhan-Jun;GUO Quan-Gui

【Institution】

CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences;CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences;CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences;CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences;CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences;CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences

【Abstract】

Silicon is one of candidates for graphite anode on account of its high theoretical specific capacity and low discharge plateau. But, the severe decay caused by huge volume change during the process of charge/discharge hinders the realization of Si commercial use in lithium-ion batteries (LIBs). A new material named Si@C/SiO x nanocomposite with core-shell structure was prepared via a facile one-step method and used as anode material for LIBs. The micromorphology, structure and electrochemical performance of Si@C/SiO x nanomaterial were investigated by SEM, TEM, XRD, and XPS measurements. It is found that the electrochemical performance of Si@C/SiO x is better than Si@C core-shell nanomaterial. After 45 cycles at current density of 200 mA/g, the capacity retentions of Si@C electrode and Si@C/SiO x electrode are 60.2% and 87.3%, respectively, and the reversible capacity of Si@C/SiO x electrode remains 787.2 mAh/g. The electrochemical performance improvement of Si@C/SiO x electrode is ascribed to the combination of carbon and SiO x , which maintains the integrity of electrode structure through buffering the big pressure more effectively. And it improves the possibility of commercial use for Si anodes.

【Keywords】

lithium-ion batteries;Si@C/SiO x nanocomposite;core-shell structure;cycle stability

References

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Total: 22 articles

  • [1] HUANG Yan-Hua;HAN Xiang;CHEN Hui-Xin;CHEN Song-Yan;YANG Yong;College of Chengyi, Jimei University;College of Physics and Mechanical & Electrical Engineering, Xiamen University;College of Chemistry & Chemical Engineering, Xiamen University;, Investigation of Porous Silicon/Carbon Composite as Anodes for Lithium Ion Batteries, Journal of Inorganic Materials,
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  • [3] Yoon Seok Jung;;Kyu T. Lee;;Seung M. Oh, Si–carbon core–shell composite anode in lithium secondary batteries, Electrochimica Acta,
  • [4] Liwen Ji;;Xiangwu Zhang, Electrospun carbon nanofibers containing silicon particles as an energy-storage medium, Carbon,

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