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Coatings 2017, 7(7), 100; doi:10.3390/coatings7070100

Electrodeposition of Vanadium Oxides at Room Temperature as Cathodes in Lithium-Ion Batteries

1
Mechanical Engineering Department, Technological Educational Institute of Crete, 710 04 Heraklion, Crete, Greece
2
Center of Materials Technology and Photonics, School of Applied Technology, Technological Educational Institute of Crete, 710 04 Heraklion, Crete, Greece
*
Author to whom correspondence should be addressed.
Received: 8 June 2017 / Revised: 3 July 2017 / Accepted: 11 July 2017 / Published: 12 July 2017
(This article belongs to the Special Issue Thin Film Deposition and Characterization Techniques)
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Abstract

Electrodeposition of vanadium pentoxide coatings was performed at room temperature and a short growth period of 15 min based on an alkaline solution of methanol and vanadyl (III) acetyl acetonate. All samples were characterized by X-ray diffraction, Raman spectroscopy, field-emission scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The current density and electrolyte concentration were found to affect the characteristics of the as-grown coatings presenting enhanced crystallinity and porous structure at the highest values employed in both cases. The as-grown vanadium pentoxide at current density of 1.3 mA·cm−2 and electrolyte concentration of 0.5 M indicated the easiest charge transfer of Li+ across the vanadium pentoxide/electrolyte interface presenting a specific discharge capacity of 417 mAh·g−1, excellent capacitance retention of 95%, and coulombic efficiency of 94% after 1000 continuous Li+ intercalation/deintercalation scans. One may then suggest that this route is promising to prepare large area vanadium pentoxide electrodes with excellent stability and efficiency at very mild conditions. View Full-Text
Keywords: electrodeposition; V2O5; room temperature; electrochemical performance electrodeposition; V2O5; room temperature; electrochemical performance
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Rasoulis, M.; Vernardou, D. Electrodeposition of Vanadium Oxides at Room Temperature as Cathodes in Lithium-Ion Batteries. Coatings 2017, 7, 100.

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