Electrostatic spray deposition of porous Fe₂V₄O₁₃ films as electrodes for Li-ion batteries

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• 作者：Si-Rong Li^a ; Nulati Yesibolati^a ; Yu Qiao^a ; Si-Yuan Ge^a ; Xu-Yong Feng^a ; Jun-Fa Zhu^b ; Chun-Hua Chen^a ; ^{cchchen@ustc.edu.cn}
• 关键词：Electrostatic spray deposition ; Thin film ; Iron vanadate ; Lithium ion battery ; Electrode material
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 April, 2012
• 卷：520
• 期：Complete
• 页码：77-82
• 文件大小：1354 K

摘要

Porous thin films composed of complex Fe/V oxides (crystalline Fe₂V₄O₁₃ and amorphous Fe₂V₄O_12.29) are prepared by electrostatic spray deposition technique. The crystalline Fe₂V₄O₁₃ thin film shows a high initial capacity of 409 mAh g^鈭?. The cyclic voltammetry analysis of a Fe₂V₄O₁₃/Li cell reveals that the crystalline Fe₂V₄O₁₃ undergoes an irreversible phase transition when the lower cut-off voltage is below 2.5 V. Compared with the crystalline Fe₂V₄O₁₃, the amorphous Fe₂V₄O_12.29 thin film delivers a lower initial capacity of 349.9 mAh g^鈭? but exhibits better cycling performance in the voltage range of 1.0-4.0 V. After 50 cycles, its capacity can still reach around 200 mAh g^鈭?. X-ray photoelectron spectroscopy (XPS) reveals that the Fe₂V₄O_12.29 thin film contains ions of mixed valence states V⁵⁺/V⁴⁺ and Fe³⁺/Fe²⁺, resulting in better rate capability for Fe₂V₄O_12.29 than for Fe₂V₄O₁₃. These results indicate that the amorphous Fe/V-oxide film is a promising electrode material for high energy applications.