Influence of Nb(5+) Doping on Structure and Electrochemical Properties of Spinel Li(1.02)Mn(2)O(4)

The Li(1.02)Nb(x)Mn(2-x)O(4) (x=0, 0.005, 0.01, 0.02, 0.04 and 0.1) materials were prepared by solid-state reaction method in which IJ2CO(3), electrolytic MnO(2) and Nb(2)O(5) were used as reactants. The influences of the Nb(5+) doping on structure, morphology and electrochemical performance were sy...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 28; no. 9; pp. 817 - 822
Main Authors Li, Jianzhong, Tian, Yanwen, Xu, Chaqing
Format Journal Article
LanguageEnglish
Published 01.09.2012
Subjects
Diffraction
Doping
Endurance
Lattice parameters
Phase (cyclic)
Scanning electron microscopy
Spinel
X-rays
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Summary:The Li(1.02)Nb(x)Mn(2-x)O(4) (x=0, 0.005, 0.01, 0.02, 0.04 and 0.1) materials were prepared by solid-state reaction method in which IJ2CO(3), electrolytic MnO(2) and Nb(2)O(5) were used as reactants. The influences of the Nb(5+) 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 LiNbO(3) existing in Li(1.02)Nb(x)Mn(2-x)O(4) phase after Nb(5+) doping. The doped materials with Nb(5+) had smaller lattice parameters and crystal volume compared with pristine Li(1.02)Mn(2)O(4). The endurance of overcharge was largely improved. In addition, the small amount of Nb(5+) doping could increase the material conductivity.
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ISSN:1005-0302