Abstract
以V 2 O 5 粉末、H 2 O 2 和Mn(CH 3 COO) 2 ·4H 2 O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Mn x V 2 O 5 。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, V 2 O 5 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: Mn 2+ 掺杂提高了V 2 O 5 的电化学性能, 其首次充放电效率由70.8%提高到90%以上; Mn 0.01 V 2 O 5 经过90次充放电循环后, 其容量仍为192.2 mAh/g。Mn 2+ 掺杂对V 2 O 5 电极材料的离子电导率有影响, Mn 0.02 V 2 O 5 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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