Electrospun V2O5 micro/nanorods as cathode materials for lithium ion battery
Electrospun V2O5 micro/nanorods as cathode materials for lithium ion battery
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静电纺丝V2O5微纳米棒作为锂离子电池正极材料
DOI：
10.1016/j.jelechem.2015.11.013
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发表时间：
2015-12-15
影响因子：
4.5
通讯作者：
Li, Xing
中科院分区：
文献类型：
--
作者：
Zhu, Congcong;Shu, Jie;Li, Xing
以廉价的NH 4VO 3和H2 C2 O 4为原料，在室温下对静电纺复合纤维进行热处理，制备出V2 O 5微/纳米棒。粉末X射线衍射分析表明，微/纳米棒为正交晶系V2 O 5（空间群Pmmn（59），a = 1.1516，B = 03566，c = 0.4373 nm），场发射扫描电子显微镜的结果表明，V2 O 5微/纳米棒的直径约为300 nm，长径比为5-10。同时，当半电池在2.0 ~ 4.0 V、50 mA g（-1）的电流密度下循环时，V2 O 5微/纳米棒阴极表现出较高的储锂性能，首次放电容量为418.8 mAh g（-1），第50次放电容量为180.5 mAh g（-1）。这可能归因于这样的事实，即微/纳米结构样品是良好的分散性，并且它们具有高的结构稳定性和在充电和放电过程中的有效的电子/离子传输。(C)2015爱思唯尔B. V.保留所有权利。
V2O5 micro/nanorods are produced through the heat treatment for the electrospun composite fibers which are prepared by using inexpensive NH4VO3 and H2C2O4 as starting materials at room temperature. Powder X-ray diffraction analysis reveals that the micro/nanorods are orthorhombic V2O5 (space group Pmmn (59), a = 1.1516, b = 03566, c = 0.4373 nm), and the results of field emission scanning electron microscopy indicate that the V2O5 micro/nanorods have a diameter of roughly 300 nm and a length-to-diameter ratio of 5-10. Meanwhile, the V2O5 micro/nanorod cathodes show a high lithium storage performance with the first discharge capacity of 418.8 mAh g(-1) and the 50th discharge capacity of 180.5 mAh g(-1), when the half cell is cycled between 2.0 and 4.0 V at a current density of 50 mA g(-1). This is possibly attributed to the fact that the micro/nanostructure samples are well dispersive and they have high structural stability and efficient electron/ion transport in the charging and discharging processes. (C) 2015 Elsevier B.V. All rights reserved.