Vanadium oxide nanotubes as cathode material for Mg-ion batteries

Christian Kolle Christensen, Daniel Risskov Sørensen, Espen Drath Bøjesen, Jonas Hyldahl Kristensen, Bo Brummerstedt Iversen, Dorthe Bomholdt Ravnsbæk

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Abstract

Vanadium oxide compounds as cathode material for secondary Li-ion batteries gained interest in the 1970’s due to high specific capacity (>250mAh/g), but showed substantial capacity fading.1 Developments in the control of nanostructured morphologies have led to more advanced materials, and recently vanadium oxide nanotubes (VOx-NT) were shown to perform well as a cathode material for Mg-ion batteries.2 The VOx-NTs are easily prepared via a hydrothermal process to form multiwalled scrolls of VO layer with primary amines interlayer spacer molecules.3 The tunable and relative large layer spacing 1-3 nm along with the open ended tube structure may allow for easy diffusion of the Mg-ions and thereby circumvents one of the problems of most cahode materials i.e. the sluggish mobility of the divalent Mg ions. Chemically exchanging the amine spacer molecules with Mg2+ ions decreases the layer spacing significantly without destroying structural integrity of the NTs,4 indicating the degree of flexibility of the VOx-NTs.

In this study, we have synthesized series of multiwalled VOx-NTs with varying spacer molecules. The mechanism for Mg-intercalation and deintercalation was studied by TEM-EDX and operando synchrotron powder X-ray diffraction measured during battery operation. These results indicate Mg-intercalation in the multiwalled VOx-NTs occurs within the space between the individual vanadium oxide layers while the underlying VOx frameworks constructing the walls are affected only to a minor degree by the intercalation up to a certain extent.
We thank the Villum Foundation under the Young Investigator Program for funding. We also thank the beamline staff at I711 for their kind assistance and Max-lab for providing beamtime.
References
1.McNulty, D. et al. Synthesis and electrochemical properties of vanadium oxide materials and structures as Li-ion battery positive electrodes. J. Power Sources 267, 831–873 (2014).
2.Jiao, L. et al. Electrochemical insertion of magnesium in open-ended vanadium oxide nanotubes. J. Power Sources 156, 673-676 (2006).
3.Sparh, M. E. et al. Vanadium oxide nanotubes: A new nanostructured redox-active material for the electrochemical insertion og lithium. J. Electrochem. Soc. 146 (8) 2780-2783 (1999).
4.Reinoso, J. M. et al. Controlled uptake and release of metal cations by vanadium oxide nanotubes. Helvetica Chimica Acta 83 1724-1733 (2000).
Translated title of the contributionVanadiumoxid nanorør som katodemateriale i Mg-ion batterier
Original languageEnglish
Publication date21. Jul 2016
Publication statusPublished - 21. Jul 2016
Event1st International Symposium on Magnesium Batteries - Helmholtz Institute Ulm - Tagungszentrum Blaubeuren, Hessenhöfe 33, 89143 Blaubeuren, Germany
Duration: 21. Jul 201622. Jul 2016
Conference number: 1
http://www.mg-batt.de/

Conference

Conference1st International Symposium on Magnesium Batteries
Number1
LocationHelmholtz Institute Ulm - Tagungszentrum Blaubeuren, Hessenhöfe 33
Country/TerritoryGermany
City89143 Blaubeuren
Period21/07/201622/07/2016
Internet address

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