以V2O5粉末、H2O2和Mn(CH3COO)2·4H2O为原料,采用水热法制备了纳米结构的锂离子电池阴极材料MnxV2O5.运用X射线衍射(XRD)、X射线光电子能谱分析(XPS)和扫描电镜(SEM)测试对制备的材料进行结构和形貌表征,并利用充放电测试和交流阻抗测试研究了样品的电化学性能.结果表明:随着锰掺杂量的增加,V2O5的正交晶型层状结构未发生改变,其层间距逐渐扩大,形貌由纳米短棒状向纳米带簇状变化.电化学测试表明:Mn2+掺杂提高了V2O5的电化学性能,其首次充放电效率由70.8％提高到90％以上;Mn0.01V2O5经过90次充放电循环后,其容量仍为192.2 mAh/g.Mn2+掺杂对V2O5电极材料的离子电导率有影响,Mn0.02V2O5离子电导率由未掺杂时的6.27× 10-4 S/cm提高到1.58×10-3 S/cm.
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