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

► Fe2V4O13 is rarely investigated for its electrochemical properties. ► It is found that amorphous film has small amounts of Fe2+ and V4+ ions which lead to both Fe3+/Fe2+ and V5+/V4+ mixed valences and enhanced electronic conductivity. ► The lithiation and delithiation are reversible in the voltage...

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Bibliographic Details
Published in:Journal of alloys and compounds 2012-04, Vol.520, p.77-82
Main Authors: Li, Si-Rong, Yesibolati, Nulati, Qiao, Yu, Ge, Si-Yuan, Feng, Xu-Yong, Zhu, Jun-Fa, Chen, Chun-Hua
Format: Article
Language:English
Subjects:
Chemistry
Crystal structure
Electric potential
Electrochemistry
Electrode material
Electrodes: preparations and properties
Electrostatic spray deposition
Electrostatics
Exact sciences and technology
General and physical chemistry
Iron
Iron vanadate
Lithium ion battery
Spray deposition
Thin film
Thin films
Voltage
X-ray photoelectron spectroscopy
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Summary:► Fe2V4O13 is rarely investigated for its electrochemical properties. ► It is found that amorphous film has small amounts of Fe2+ and V4+ ions which lead to both Fe3+/Fe2+ and V5+/V4+ mixed valences and enhanced electronic conductivity. ► The lithiation and delithiation are reversible in the voltage range of 2.5–4.0V. Porous thin films composed of complex Fe/V oxides (crystalline Fe2V4O13 and amorphous Fe2V4O12.29) are prepared by electrostatic spray deposition technique. The crystalline Fe2V4O13 thin film shows a high initial capacity of 409mAhg−1. 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 2.5V. Compared with the crystalline Fe2V4O13, the amorphous Fe2V4O12.29 thin film delivers a lower initial capacity of 349.9mAhg−1 but exhibits better cycling performance in the voltage range of 1.0–4.0V. After 50 cycles, its capacity can still reach around 200mAhg−1. X-ray photoelectron spectroscopy (XPS) reveals that the Fe2V4O12.29 thin film contains ions of mixed valence states V5+/V4+ and Fe3+/Fe2+, resulting in better rate capability for Fe2V4O12.29 than for Fe2V4O13. These results indicate that the amorphous Fe/V-oxide film is a promising electrode material for high energy applications.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2011.12.092