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Synthesis and electrochemical performance of Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2-V_2O_5 composite cathode material

Zhang Weibo;Guo Bing;Chen Fei;Xu Jiangsheng;School of Chemistry and Chemical Engineering,Hefei University of Technology;  
One dimensional(1D)micro/nanostructured porous Li [Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2microrods have been prepared by a stepwise co-precipitation route followed by post-heat treatment.Li [Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2-V_2O_5 has been obtained by making use of the porous structure of Li [Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2microrods.The chemical composition,morphology,and structure of the material were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).The Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2-V_2O_5 composite cathode material with 10%(mass fraction)V2O5has a better layered structure according to calculated lattice parameters.The electrochemical performance of the as-prepared material was studied by galvanostatic charging/discharging measurements.The initial coulombic efficiency of the Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2with 10% V_2O_5 was improved from 86% to 111%,and the discharge capacity was also enhanced,indicating an effective route to solve initial irreversible capacity loss of lithium-rich materials.
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