Preparation and electrochemical studies of Y-doped LiVPO₄F cathode materials for lithium-ion batteries

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• 作者：Shengkui Zhong (12) zhongshk@glite.edu.cn
  Fengpeng Li (1)
  Jiequn Liu (12)
  Yanhong Li (3)
  Xingsheng Deng (12)
• 关键词：lithium ; ion batteries ; cathode material ; LiVPO4F ; Y ; doping ; carbothermal reduction method ; cyclic voltammogram (CV)
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版时间：August 2009
• 出版年：2009
• 期刊代码：pc358_1000-2413
• 类别：ch
• 卷：24
• 期：4
• 页码：552-556
• 数据来源：sp

摘要

Y-doped LiVPO₄F cathode materials were prepared by a carbothermal reduction(CTR) process. The properties of the Y-doped LiVPO₄F samples were investigated by X-ray diffraction (XRD) and electrochemical measurements. XRD studies show that the Y-doped LiVPO₄F samples have the same triclinic structure as the undoped LiVPO₄F. The Li extraction/insertion performances of Y-doped LiVPO₄F samples were investigated through charge/discharge, cyclic voltammogram (CV), and electrochemical impedance spectra(EIS). The optimal doping content of Y is x=0.04 in LiY _x V_1−x PO₄F system. The Y-doped LiVPO₄F samples show a better cyclic ability. The electrode reaction reversibility is enhanced, and the charge transfer resistance is decreased through the Y-doping. The improved electrochemical performances of the Y-doped LiVPO₄F cathode materials are attributed to the addition of Y3+ ion by stabilizing the triclinic structure.