层状锂锰钒氧化物的合成与电化学性能研究  

Preparation and Electrochemical Properties of Layered Lithium Vanadium Oxides Doped with Manganese

作　　者：吴阳[1] 叶兆宝[1] 陈前火[1] 童庆松[1] 连锦明[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2006年第2期60-63,共4页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省自然科学基金资助项目(E0110021);福建省教育厅基金资助项目(JA02159;JB03137);福建师范大学青年教师扶苗基金资助项目(F023)

摘　　要：用高温固相反应法合成掺锰的层状锂钒氧化物Li1.2V3-xMnxF0.02O7.98．通过FTIR和XRD对样品进行表征，并研究了样品的充放电性能．实验结果表明：除Li1.2V2.50Mn0.05F0.02O7.98样品外，所合成的其余4个样品均为层状锂锰钒氧化物．掺锰量最少的样品Li1.2V2.98Mn0.02F0.02O7.98，在4．0～2．0V区间放电时，其初始放电容量可达233．4mAh／g，但循环性能不佳．随着掺锰量的增加，样品的循环性能有了显著改善，初始放电容量降低．掺锰量较大的样品Li1.2V2.80Mn0.20F0.02O7.98的初始放电容量较低（164．8mAh／g），但其循环性能在所有样品中是最好的，说明掺杂适量的锰可以使层状锂钒氧化物的结构更稳定，从而提高样品的循环性能．The layered Li1.2V3-xMnxF0.02O7.98 materials doped with manganese were synthesized by high temperature solid-state reaction. The synthetic materials were characterized by FTIR and XRD. Meantime, electrochemical properties of the materials in the organic electrolyte were researched. The results showed that all the materials had the layered structure except Li1.2V2.50Mn0.05F0.02O7.98. The first discharge capacities of Li1.2V2.98Mn0.02F0.02O7.98 doped with the least amount manganese were 233.4 mAh/g in 4.0～2.0 V region. But its cyclic stability was very poor. The Li1.2V2.80Mn0.20F0.02O7.98 doped with the more amount manganese had lower initial discharge capacities （164.8 mAh/g）. However its cycle performance was the best in all samples, which indicated appropriate doped manganese could make the structure more stable and increase the cycle performance of the samples.

关 键 词：锂离子电池 层状 锂锰钒氧化物 

分 类 号：TM911[电气工程—电力电子与电力传动]