Lookup NU author(s): Professor Ulrich Stimming
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Affordable energy storage is crucial for a variety of technologies. One option is sodium-ion batteries (NIBs) for which, however, suitable anode materials are still a problem. We report on the application of a promising new class of materials, polyoxometalates (POMs), as an anode in NIBs. Specifically, Na6[V10O28]·16H2O is being synthesized and characterized. Galvanostatic tests reveal a reversible capacity of approximately 276 mA h g-1 with an average discharge potential of 0.4 V vs. Na/Na+, as well as a high cycling stability. The underlying mechanism is rationalized to be an insertion of Na+ in between the [V10O28]6- anions rather than an intercalation into a crystal structure; the accompanying reduction of V+V to V+IV is confirmed by X-Ray Photoelectron Spectroscopy. Finally, a working full-cell set-up is presented with the POM as the anode, substantiating the claim that Na6[V10O28]·16H2O is a promising option for future high-performing sodium-ion batteries. Vanadium-based polyoxometalate as new material for sodium-ion battery anodes - ResearchGate. Available from: http://www.researchgate.net/publication/274899627_Vanadium-based_polyoxometalate_as_new_material_for_sodium-ion_battery_anodes [accessed Nov 2, 2015].
Author(s): Hartung S, Bucher N, Chen H-Y, Al-Oweini R, Sreejith S, Borah P, Yanil Z, Kortz U, Stimming U, Hoster HE, Srinivasan M
Publication type: Article
Publication status: Published
Journal: Jounal of Power Sources
Print publication date: 15/08/2015
Online publication date: 09/04/2015
Acceptance date: 03/04/2015
ISSN (print): 0378-7753
ISSN (electronic): 1873-2755
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