The increase in energy density is i.a. a result of the divalent Mg2+ carrying twice as much charge as the monovalent Li+.1,2 However, the higher charge also poses a problem as it significantly increases the charge density of the ion, which results in stronger interactions with the host lattice of the electrodes and hampers facile ion transport. Therefore, development of novel electrode materials for effective Mg-ion storage is a vital step for the realization of this battery technology.3
In this study, we have synthesized series of vanadium oxides with varying chemical composition and varying nanotopologies, e.g. multiwalledVOx-nanotubes. The mechanism for Mg-intercalation and deintercalation is studied by operando synchrotron powder X-ray diffraction measured during battery operation. These results Mg-intercalation in the multiwalled VOx -nanotubes occurs within the space between the individual vanadium oxide layers building the walls of the nanotubes while the underlying VOx-frameworks constructing the walls are affected only to a minor degree by the intercalation. Our investigation provides new insights into the size requirements of the channels/layers in the host frameworks that will allow for efficient Mg-ion storage.
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.
1. R. van Noorden, Nature 2014, 507, 26
2. Pellion Technologies, “Moving Beyond Lithium with Low-Cost, High-Energy, Rechargeable Magnesium Batteries”, Pellion White Paper, September 2011
3. P. Saha, M. K. Datta, O. I. Velikokhatnyi, A. Manivannan, D. Alman, P. N. Kumta, Progress in Materials Science 2014, 66, 1.
|Translated title of the contribution||Operando pulver diffraktion af vanadiumbaserede nanomaterialer som katode i Mg-ion batterier|
|Publication date||26. May 2016|
|Publication status||Published - 26. May 2016|
|Event||Danscatt annual meeting 2016 - Auditorium A3, Universitetsparken 2, 2100 Copenhagen, Denmark, Copenhagen, Denmark|
Duration: 26. May 2016 → 27. May 2016
|Conference||Danscatt annual meeting 2016|
|Location||Auditorium A3, Universitetsparken 2, 2100 Copenhagen, Denmark|
|Period||26/05/2016 → 27/05/2016|