期刊
ELECTROCHIMICA ACTA
卷 64, 期 -, 页码 81-86出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.12.131
关键词
Electrostatic spray deposition (ESD); Thin film; Vanadium pentoxide; Lithium ion battery; Cathode material
资金
- National Science Foundation of China [20971117, 10979049]
- Education Department of Anhui Province [KJ2009A142]
Three-dimensional (3D) porous V2O5 and Fe0.1V2O5.15 thin films have been prepared by electrostatic spray deposition technique. X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy are employed to investigate the structures and valence states of the films. Galvanostatic cell cycling, cyclic voltammetry and impedance spectroscopy are used to characterize their electrochemical properties. The Fe0.1V2O5.15 thin film shows much better cycling performance than the non-doped V2O5 thin film. Fe3+ can act as a stabilizing agent in the layered V2O5 and increase the reversibility of the charge and discharge processes towards deeper depth of lithium insertion/extraction. The dissolution of the active material in the electrolyte can also be significantly suppressed in the Fe-doped sample. Nevertheless, the Fe-doping causes a slight decrease in lithium ion diffusion coefficient. (C) 2012 Elsevier Ltd. All rights reserved.
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