能源化学(英文版)

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (3): 357-362.

• Communication •    下一篇

Nb2O5-carbon core-shell nanocomposite as anode material for lithium ion battery

Ge Lia,b, Xiaolei Wangb, Xueming Maa   

  1. a. Department of Physics, East China Normal University, Shanghai 200241, China;
    b. Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, United States
  • 收稿日期:2012-10-17 修回日期:2012-12-04 出版日期:2013-05-20 发布日期:2013-05-31
  • 通讯作者: Xiaolei Wang
  • 基金资助:

    This work was supported by Nano Special Plan from Shanghai Municipal Science and Technology Plan of Commission (No.1052nm06900).

Nb2O5-carbon core-shell nanocomposite as anode material for lithium ion battery

Ge Lia,b, Xiaolei Wangb, Xueming Maa   

  1. a. Department of Physics, East China Normal University, Shanghai 200241, China;
    b. Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, United States
  • Received:2012-10-17 Revised:2012-12-04 Online:2013-05-20 Published:2013-05-31
  • Supported by:

    This work was supported by Nano Special Plan from Shanghai Municipal Science and Technology Plan of Commission (No.1052nm06900).

摘要： Nb2O5-carbon nanocomposite is synthesized through a facile one-step hydrothermal reaction from sucrose as the carbon source, and studied as an anode material for high-performance lithium ion battery. The structural characterizations reveal that the nanocomposite possesses a core-shell structure with a thin layer of carbon shell homogeneously coated on the Nb2O5 nanocrystals. Such a unique structure enables the composite electrode with a long cycle life by preventing the Nb2O5 from volume change and pulverization during the charge-discharge process. In addition, the carbon shell efficiently improves the rate capability. Even at a current density of 500 mA·g-1, the composite electrode still exhibits a specific capacity of ～100 mAh·g-1. These results suggest the possibility to utilize the Nb2O5-carbon core-shell composite as a high performance anode material in the practical application of lithium ion battery.

关键词: niobium pentoxide, core-shell, long cycle life, high performance anode, lithium ion battery

Abstract: Nb2O5-carbon nanocomposite is synthesized through a facile one-step hydrothermal reaction from sucrose as the carbon source, and studied as an anode material for high-performance lithium ion battery. The structural characterizations reveal that the nanocomposite possesses a core-shell structure with a thin layer of carbon shell homogeneously coated on the Nb2O5 nanocrystals. Such a unique structure enables the composite electrode with a long cycle life by preventing the Nb2O5 from volume change and pulverization during the charge-discharge process. In addition, the carbon shell efficiently improves the rate capability. Even at a current density of 500 mA·g-1, the composite electrode still exhibits a specific capacity of ～100 mAh·g-1. These results suggest the possibility to utilize the Nb2O5-carbon core-shell composite as a high performance anode material in the practical application of lithium ion battery.

Key words: niobium pentoxide, core-shell, long cycle life, high performance anode, lithium ion battery