Hartung, Steffen and Bucher, Nicolas and Chen, Han-Yi and Al-Oweini, Rami and Sreejith, Sivaramapanicker and Borah, Parijat and Yanli, Zhao and Kortz, Ulrich and Stimming, Ulrich and Hoster, Harry and Srinivasan, Madhavi (2015) Vanadium-based polyoxometalate as new material for sodium-ion battery anodes. Journal of Power Sources, 288. pp. 270-277. ISSN 0378-7753
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Abstract
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.