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Enhanced charge storage of nanometric ζ-V₂O₅ in Mg electrolytes

Johnson, ID; Nolis, G; Yin, L; Yoo, HD; Parajuli, P; Mukherjee, A; Andrews, JL; ... Darr, JA; + view all (2020) Enhanced charge storage of nanometric ζ-V₂O₅ in Mg electrolytes. Nanoscale , 12 (43) pp. 22150-22160. 10.1039/d0nr05060a. Green open access

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Abstract

V2O5 is of interest as a Mg intercalation electrode material for Mg batteries, both in its thermodynamically stable layered polymorph (α-V2O5) and in its metastable tunnel structure (ζ-V2O5). However, such oxide cathodes typically display poor Mg insertion/removal kinetics, with large voltage hysteresis. Herein, we report the synthesis and evaluation of nanosized (ca. 100 nm) ζ-V2O5 in Mg-ion cells, which displays significantly enhanced electrochemical kinetics compared to microsized ζ-V2O5. This effect results in a significant boost in stable discharge capacity (130 mA h g−1) compared to bulk ζ-V2O5 (70 mA h g−1), with reduced voltage hysteresis (1.0 V compared to 1.4 V). This study reveals significant advancements in the use of ζ-V2O5 for Mg-based energy storage and yields a better understanding of the kinetic limiting factors for reversible magnesiation reactions into such phases.

Type: Article
Title: Enhanced charge storage of nanometric ζ-V₂O₅ in Mg electrolytes
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d0nr05060a
Publisher version: https://doi.org/10.1039/d0nr05060a
Language: English
Additional information: This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence (http://creativecommons.org/licenses/by-nc/3.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10114708
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