Journal article
Electrostatic spray deposition of porous Fe2V4O13 films as electrodes for Li-ion batteries
CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Anhui Hefei 230026, China1
National Synchrotron Radiation Laboratory, Anhui Hefei 230026, China2
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.
| Language: | English |
|---|---|
| Year: | 2012 |
| Pages: | 77-82 |
| ISSN: | 18734669 and 09258388 |
| Types: | Journal article |
| DOI: | 10.1016/j.jallcom.2011.12.092 |
