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    Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Power Sources. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Power Sources 288, 2015 DOI: 10.1016/j.jpowsour.2015.04.009

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Vanadium-based polyoxometalate as new material for sodium-ion battery anodes

Research output: Contribution to journalJournal articlepeer-review

Published
  • Steffen Hartung
  • Nicolas Bucher
  • Han-Yi Chen
  • Rami Al-Oweini
  • Sivaramapanicker Sreejith
  • Parijat Borah
  • Zhao Yanli
  • Ulrich Kortz
  • Ulrich Stimming
  • Harry Hoster
  • Madhavi Srinivasan
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<mark>Journal publication date</mark>15/08/2015
<mark>Journal</mark>Journal of Power Sources
Volume288
Number of pages8
Pages (from-to)270-277
Publication StatusPublished
Early online date9/04/15
<mark>Original language</mark>English

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.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Journal of Power Sources. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Power Sources 288, 2015 DOI: 10.1016/j.jpowsour.2015.04.009