Li_3V_2(PO_4)_3掺锰的改性研究  

Study on modification of Li_3V_2(PO_4)_3 by Mn doping

作　　者：刘云霞[1] 朱先军[2] 詹晖[1] 周运鸿[1] 

机构地区：[1]武汉大学化学与分子科学院,湖北武汉430079 [2]华中师范大学化学学院,湖北武汉430079

出　　处：《电源技术》2011年第2期173-175,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金项目(20873094)

摘　　要：采用溶胶凝胶法制备了锂离子电池正极材料Li3+xMnxV2-x(PO4)3(x=0、0.05、0.10、0.20)。通过X射线衍射(XRD)和扫描电子显微镜(SEM)分别对材料的结构及表面形貌进行了表征,结果表明:Li3+xMnxV2-x(PO4)3与Li3V2(PO4)3具有相同的结构,均属单斜晶系P21/n,且随着锰含量的增加,样品的颗粒变大。循环伏安和充放电测试结果表明,随着锰含量的增加,样品的首次比容量减少,但Li3.1Mn0.1V1.9(PO4)3循环性能较好,说明少量Mn的掺杂可以改善Li3V2(PO4)3的循环性能。Li-ion battery cathode materials Li3＋xMnxV2-x（PO4）3（x=0,0.05,0.10,0.20） were synthesized by sol-gel method.The structure and morphology of samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The electrochemical behaviors were characterized by galvanostatic charge/discharge and cyclic voltammetry.The results show that the particle size of products are increased by adding small amountof Mn in Li3V2（PO4）3,but the crystal structure does not changed comparing with Li3V2（PO4）3 without Mn2＋.The initial ca-pacity of Li3＋xMnxV2-x（PO4）3 decreases with the Mn content increasing,however,Li3.1Mn0.1V1.9（PO4）3 displays a more stable cycle performance than Li3V2（PO4）3,which indicates that a small mount of Mn doping can enhance its cycle stability.

关 键 词：LI3V2(PO4)3 锰掺杂 溶胶凝胶法 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]