Enhanced performance as a lithium-ion battery cathode of electrodeposited V2O5 thin films by e-beam irradiation |
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Authors: | Kyung-Hwa Kim Dong-Kyun Roh In Kyu Song Byung-Cheol Lee Sung-Hyeon Baeck |
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Institution: | (1) Department of Chemical Engineering, Inha University, Incheon, South Korea;(2) Department of Chemical and Biological Engineering, Seoul National University, Seoul, South Korea;(3) Quantum Optics Division, Korea Atomic Energy Research Institute, Daejeon, South Korea; |
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Abstract: | The influence of electron beam irradiation on the electrochemical properties of electrodeposited V2O5 thin films was investigated. V2O5 thin films were deposited electrochemically onto indium tin oxide-coated glass from an aqueous vanadyl sulfate hydrate (VOSO4⋅nH2O) solution using Pt and Ag/AgCl as the counter electrode and reference electrode, respectively. Electrodeposition was performed
potentiostatically at 1.7 V vs. Ag/AgCl. Electrodeposited samples were then subjected to a 1-MeV electron beam using an electron
beam accelerator at the Korea Atomic Energy Research Institute. For comparison, a control sample was not irradiated with the
electron beam. Crystallinity change before and after electron beam irradiation was investigated by X-ray diffraction and the
oxidation state of vanadium determined by X-ray photoelectron spectroscopy. Scanning electron microscopy was utilized to examine
surface morphology. It was observed that electron beam irradiation altered the oxidation state of vanadium and increased crystallinity.
Significant morphological changes of V2O5 thin films were also observed with electron beam irradiation. Cyclic voltammetry was employed to evaluate the electrochemical
properties of the synthesized V2O5 films in terms of their application as electrodes of lithium-ion battery. Compared with the control sample, which was not
irradiated with an electron beam, the electron beam-irradiated V2O5 specimens showed much higher capacitance. |
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