锂离子电池正极材料Li_(1+x)V_3O_8合成及电化学性能的研究  

Preparation of Li_(1+x)V_3O_8 and its electrochemical performance for cathode of lithium ion batteries

作　　者：叶琬玲[1] 刘恒[1] 班文俊[1] 吕玲[1] 陈渝[1] 余艳丽[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《功能材料》2008年第12期2022-2024,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50574063);四川省国际合作资助项目(2008HH0011)

摘　　要：利用液相沉淀法合成得到超细、粒径分布窄的球形V2O5，以该V2O5和LiOH·H2O为原料在较低温度下煅烧得到棒状Li1＋xV3O8颗粒。采用XRD、SEM对样品的结构和形貌分别进行了表征。并在电压为1．8～3．8V范围，放电倍率为0．2C对制备的电极材料进行了电池性能测量。结果表明，采用比传统固相法低的温度和时间可以获得单斜晶系的纯相L1＋xV3O8。450℃合成的Li1＋xV3O8首次放电比容量达到275mAh／g，550℃合成的Li1＋xV308在循环15次后的比容量保持率为85％。Li1＋xV3O8, as cathode material for Li-ion battery, was synthesized with LiOH· H2O ana V2O5 as raw materials at low temperature. The V2O5 particles which were synthesized by liquid phase precipitation were ultrafine, spherical and their size distribution was narrow. The structure and morphology of samples were characterized by means of XRD and SEM respectively. The Li1＋xV3O8 particles were galvanostatically cycled at rate of 0.2C and over the potential region of 1.8-3.8V. The results indicated that pure monoclinic Li1＋xV3O8 can be found and the reaction time and temperature is shorter than that of conventional high solid-state method. The Li1＋xV3O8 synthesized at 450, 550℃ respectively delivered an initial discharge capacity 275mAh/g and 220mAh/g, and the latter remained 85% after 15 cycles.

关 键 词：锂离子电池 正极材料 LI1+XV3O8 V2O5 

分 类 号：TM912.9[电气工程—电力电子与电力传动]