In Operando Synchrotron Diffraction and in Operando X-ray Absorption Spectroscopy Investigations of Orthorhombic V₂O₅ Nanowires as Cathode Materials for Mg-Ion Batteries
2019
Fu, Qiang | Sarapulova, Angelina | Trouillet, Vanessa | Zhu, Lihua | Fauth, Francois | Mangold, Stefan | Welter, Edmund | Indris, Sylvio | Knapp, Michael | Dsoke, Sonia | Bramnik, Natalia | Ehrenberg, Helmut
Orthorhombic V₂O₅ nanowires were successfully synthesized via a hydrothermal method. A cell-configuration system was built utilizing V₂O₅ as the cathode and 1 M Mg(ClO₄)₂ electrolyte within acetonitrile, together with MgₓMo₆S₈ (x ≈ 2) as the anode to investigate the structural evolution and oxidation state and local structural changes of V₂O₅. The V₂O₅ nanowires deliver an initial discharge/charge capacity of 103 mAh g–¹/110 mAh g–¹ and the highest discharge capacity of 130 mAh g–¹ in the sixth cycle at C/20 rate in the cell-configuration system. In operando synchrotron diffraction and in operando X-ray absorption spectroscopy together with ex situ Raman and X-ray photoelectron spectroscopy reveal the reversibility of magnesium insertion/extraction and provide information on the crystal structure evolution and changes of the oxidation states during cycling.
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