Nanocomposite Fe2O3-Se as a new lithium storage material |
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Authors: | Wen-Jing Li |
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Affiliation: | Department of Chemistry & Laser Chemistry Institute, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, PR China |
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Abstract: | The electrochemical properties of nanocomposite Fe2O3-Se thin film prepared by pulsed laser deposition (PLD) method have been investigated by cyclic voltammetry and charge/discharge measurements. A large reversible capacity of nanocomposite Fe2O3-Se thin film was found to be around 650 mAh g−1. A new couple of reduction and oxidation peaks at 1.4 and 1.8 V were observed from cyclic voltammogram for the first time. Our data demonstrated that nanocomposite Fe2O3-Se exhibit larger capacity and better cycle performance than pure Fe2O3. The electrochemical reaction mechanisms of Fe2O3-Se with lithium were examined by X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM) and selected-area electron diffraction (SAED). The reversible conversions reaction of nanosized metal Fe with Li2Se and Li2O formed after initial discharge process into FeSe and Fe2O3 respectively were revealed. |
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Keywords: | Fe2O3-Se Pulsed laser deposition Lithium-ion batteries |
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