In Operando Synchrotron Diffraction and in Operando X-ray Absorption Spectroscopy Investigations of Orthorhombic V2O5 Nanowires as Cathode Materials for Mg-Ion Batteries

• DOI: 10.1021/jacs.8b08998
• Publication Date: 2019-01-17T15:38:01Z
• Authors: Qiang Fu; Angelina Sarapulova; Vanessa Trouillet; Lihua Zhu; Francois Fauth; Stefan Mangold; Edmund Welter; Sylvio Indris; Michael Knapp; Sonia Dsoke; Natalia Bramnik; Helmut Ehrenberg
• Keywords: Technology; ddc:600; info:eu-repo/classification/ddc/540; info:eu-repo/classification/ddc/600; 600; 02 engineering and technology; 540; 0210 nano-technology; 530

Orthorhombic $\mathrm{V_{2}O_{5}}$ nanowires were successfully synthesized via a hydrothermal method. A cell-configuration system was built utilizing $\mathrm{V_{2}O_{5}}$ as the cathode and 1 M Mg(ClO$_4$)$_2$ electrolyte within acetonitrile, together with Mg$_x$Mo$_6$S$_8$ (x ≈ 2) as the anode to investigate the structural evolution and oxidation state and local structural changes of $\mathrm{V_{2}O_{5}}$. The $\mathrm{V_{2}O_{5}}$ 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.<br/>Journal of the American Chemical Society 141(6), 2305 - 2315 (2019). doi:10.1021/jacs.8b08998<br/>Published by American Chemical Society, Washington, DC<br/>