Li_2FeSiO_4正极材料的合成及电化学性能  

Synthesis and electrochemical performance of Li_2FeSiO_4 cathode material

作　　者：黄锋涛[1] 徐丹[1] 舒杰[1] 水淼[1] 

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《电池工业》2010年第5期300-303,共4页Chinese Battery Industry

基　　金：浙江省教育厅科研项目(项目编号:Y200907481)

摘　　要：采用液相-真空固相法合成锂离子电池正极材料Li2FeSiO4,并用TG-DTA、XRD、红外和电化学性能测试等方法对材料的性能进行了表征。前驱体的TG-DTA曲线表明,合成Li2FeSiO4时烧结温度应高于600℃。XRD显示Li2FeSiO4结晶良好。红外测试的主要官能团来源于Li2FeSiO4的特征吸收峰。电化学测试表明,Li2FeSiO4具有优良的电化学性能,30次循环后仍保持47.4mAh/g的可逆容量,显示了它作为锂离子电池正极材料的巨大潜力。In this paper,Li2FeSiO4 was prepared with solution assistant vacuum solid-state reaction method.The sample was characterized by thermo gravimetric-differential thermal analysis（TG-DTA）,X-ray diffraction（XRD）,infrared spectroscopy and electrochemical performance measurement.The TG-DTA curves of the precursor showed that the Li2FeSiO4 could be obtained at 600 ℃ or above.The XRD pattern indicated that the Li2FeSiO4 crystallized in an orthorhombic structure with a space group of Pmn21.The electrochemical test demonstrated the initial discharge capacity of the prepared Li2FeSiO4 material was 41 mAh/g at 60 ℃.After 30 cycles,this cathode material could deliver a reversible discharge capacity of 47.4mAh/g.Therefore,it was a promising cathode material for Li-ion batteries.

关 键 词：锂离子电池 正极材料 LI2FESIO4 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]