Influence of Nb^(5+) Doping on Structure and Electrochemical Properties of Spinel Li_(1.02)Mn_2O_4  

作　　者：Jianzhong Li Yanwen Tian Chaqing Xu 

机构地区：[1]School of Material and Metallurgy,Northeastern University,Shenyang 110819,China

出　　处：《Journal of Materials Science & Technology》2012年第9期817-822,共6页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 51004028);the Special Fund for Basic Scientific Research of Central Colleges, China (No.N100402002)

摘　　要：The Li1.02NbxMn2-xO4 （x=0, 0.005, 0.01, 0.0：2, 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.The Li1.02NbxMn2-xO4 （x=0, 0.005, 0.01, 0.0：2, 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.

关 键 词：Lithium-ion battery Cathode material Nb-doping Cyclic voltammograms 

分 类 号：TQ137.12[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]