Magnesium batteries have attracted great attention as an alternative to Li-ion batteries but still suffer from limited choice of positive electrode materials. V2O5 exhibits high theoretical capacities, but previous studies have been mostly limited to α-V2O5. Herein, we report on the β-V2O5 polymorph as a Mg intercalation electrode.
The structural changes associated with the Mg2+ (de-) intercalation were analyzed by a combination of several characterization techniques: in situ high resolution X-ray diffraction, scanning transmission electron microscopy, electron energy-loss spectroscopy, and X-ray absorption spectroscopy. The reversible capacity reached 361 mAh g–1, the highest value found at room temperature for V2O5 polymorphs.
Sustainable energy conversion & storage systems
β-V2O5 as Magnesium Intercalation Cathode
Rafael Trócoli, Prakash Parajuli, Carlos Frontera, Ashley P. Black, Grant C. B. Alexander, Indrani Roy, M. Elena Arroyo-de Dompablo, Robert F. Klie, Jordi Cabana, and M. Rosa Palacín*