J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (9): 817-822.

• Reviews • 上一篇    下一篇

Influence of Nb5＋ doping on structure and electrochemical properties of spinel Li1.02Mn2O4

李建中   

  1. 东北大学
  • 收稿日期:2011-10-12 修回日期:2012-02-12 出版日期:2012-09-28 发布日期:2012-09-28
  • 通讯作者: 李建中
  • 基金资助:

    无锡钢电镀过程中铬离子、氟离子对阳极腐蚀行为的研究

Influence of Nb5+ Doping on Structure and Electrochemical Properties of Spinel Li1.02Mn2O4

Jianzhong Li, Yanwen Tian, Chaqing Xu   

  1. northeastern university
  • Received:2011-10-12 Revised:2012-02-12 Online:2012-09-28 Published:2012-09-28
  • Contact: Jianzhong LI
  • Supported by:

    the National Natural Science Foundation of China (No. 51004028) and the Special Fund for Basic Scientific Research of Central Colleges, China (No. N100402002).

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摘要：

The Li1.02NbxMn2-xO4（x=0, 0.005, 0.01, 0.02, 0.04 and 0.1）were prepared by solid-state reaction method in which Li2CO3, electrolytic MnO2 and Nb2O5 were used as reactants. The influence of the Nb5+ doping on structure, morphology and electrochemical performance were systemically investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV) and AC impedance. XRD test showed that the prepared samples have single spinel structure although there was impurity phase of LiNbO3 existing in Li1.02NbxMn2-xO4 phase after Nb5+ doping. The doped materials with Nb5+ have smaller lattice parameters and the crystal volume compared with pristine Li1.02Mn2O4. The endurance of overcharge was largely improved. In addition, the small amount of Nb5+ doping can increase the material conductivity.

Abstract:

The Li1.02NbxMn2-xO4 (x=0, 0.005, 0.01, 0.02, 0.04 and 0.1) materials were prepared by solid-state reaction method in which Li2CO3, electrolytic MnO2 and Nb2O5 were used as reactants. The influences of the Nb5+ doping on structure, morphology and electrochemical performance were systemically investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV) and AC impedance. XRD test showed that the prepared samples had single spinel structure although there was impurity phase of LiNbO3 existing in  Li1.02NbxMn2-xO4 phase after Nb5+ doping. The doped materials with Nb5+ had smaller lattice parameters and crystal volume compared with pristine Li1.02Mn2O4. The endurance of overcharge was
largely improved. In addition, the small amount of Nb5+ doping could increase the material conductivity.

Key words: Lithium-ion battery, Cathode material, Nb-doping, Cyclic voltammograms