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电化学(中英文) ›› 2004, Vol. 10 ›› Issue (4): 391-396. 

• 研究论文 • 上一篇    下一篇

BaFeSi/C复合物作为锂离子电池负极材料的研究

冯瑞香,董华,艾新平,杨汉西   

  1. 武汉大学化学学院,武汉大学化学学院,武汉大学化学学院,武汉大学化学学院 湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072
  • 收稿日期:2004-11-28 修回日期:2004-11-28 出版日期:2004-11-28 发布日期:2004-11-28

The Investigation of BaFeSi/C Alloy Composite as Anode Materials for Li-ion Battery

FENG Rui-xiang, DONG Hua, AI Xin-ping~*,YANG Han-xi   

  1. (Department of Chemistry, Wuhan University, Wuhan 430072, China
  • Received:2004-11-28 Revised:2004-11-28 Published:2004-11-28 Online:2004-11-28

摘要:  采用机械球磨法制备BaFeSi/C复合物,并考察了其作为锂离子电池负极材料的电化学性能.结果表明,这种复合材料具有较高的初始放电容量、合适的充放电平台和良好的循环可逆性.XRD和XPS研究证明:BaFeSi/C复合物循环性能的提高主要源于惰性导电组分FeSi2、BaSi2和外层石墨骨架的协同作用,它们的存在不仅有效地缓冲了活性组分硅的体积变化,同时在很大程度上增强了复合材料的电子导电性和离子导电性.

关键词: BaFeSi/C复合物, 机械球磨, 负极材料, 锂离子电池

Abstract: A novel BaFeSi/C composite was prepared by mechanical ball milling, and lithium insertion reactions on the composite electrode were investigated by cyclic voltammetry ,charge-discharge measurements, XRD and XPS spectroscopy. It is demonstrated that the capacity retention with indiscernible capacity decas during charge-discharge cycling. The improved cycling ability of the composite is suggested from a cooperative action by inactive FeSi_(2 )and BaSi_2 matrix and outer graphite shell, which both buffer the volumetric changes of the active Si phase and provide a good connection for electronic and ionic conduction during lithium insertion and extraction processes.

Key words: BaFeSi/C composite, Mechanical ball milling, Anode materials

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