Issue 43, 2020

Enhanced charge storage of nanometric ζ-V2O5 in Mg electrolytes


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.

Graphical abstract: Enhanced charge storage of nanometric ζ-V2O5 in Mg electrolytes

Supplementary files

Article information

Article type
06 Jul 2020
23 Oct 2020
First published
30 Oct 2020
This article is Open Access
Creative Commons BY license

Nanoscale, 2020,12, 22150-22160

Enhanced charge storage of nanometric ζ-V2O5 in Mg electrolytes

I. D. Johnson, G. Nolis, L. Yin, H. D. Yoo, P. Parajuli, A. Mukherjee, J. L. Andrews, M. Lopez, R. F. Klie, S. Banerjee, B. J. Ingram, S. Lapidus, J. Cabana and J. A. Darr, Nanoscale, 2020, 12, 22150 DOI: 10.1039/D0NR05060A

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