Li_2Fe_(1-x)Mn_xSiO_4正极材料的合成及电化学性能

Synthesis and Electrochemical Performance of Li_2Fe_(1-x)Mn_xSiO_4 Cathode Material

采用真空固相法成功地合成了锂离子电池正极材料Li2Fe1-xMnxSiO4,并用FTIR、XRD和电化学性能测试对材料进行了表征。FTIR和XRD测试表明,Mn很好地固溶到Li2FeSiO4中。电化学性能测试表明,当w(Mn)=0.1%时,合成的Li2Fe1-xMnxSiO4电化学性能最佳,首次放电容量达到67.7mAh/g,20次循环后容量仍保持在44.8mAh/g。

Li2Fe1-xMnxSiO4 was synthesized by solid-state reaction combining with vacuum sintering.The crystal structure and charge/discharge performance of Li2Fe1-xMnxSiO4 were analyzed by X-ray diffraction（XRD）,infrared spectroscopy and electrochemical performance measurement.The electrochemical tests demonstrate that Li2Fe1-xMnxSiO4（x=0.1） shows the best electrochemical performance with an initial discharge capacity of 67.7 mAh/g,and the discharge capacity remains 44.8 mAh/g after 20 cycles.