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Electronic structure and ionic diffusion of green battery cathode material: Mg2Mo6S8
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Condensed Matter Theory Group, Department of Physics and Astronomy, Uppsala University.
2014 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 261, 17-20 p.Article in journal (Refereed) Published
Abstract [en]

We report ab-initio density functional theory calculations of crystal and electronic structure of Mg2Mo6S8, a candidate material to be used in rechargeable magnesium batteries, by employing hybrid exchange-correlation functionals. We find that Mg2Mo6S8 crystalizes in a triclinic geometry and it is a semiconductor with an indirect band gap. Ab-initio molecular dynamics shows that Mg ions present progressive diffusion starting at 200 K with a preferable path through the channel between Mo6S8 blocks along the [010] direction. The intercalation voltage of the system is also determined and the results show that the voltage evaluated by PBE and hybrid functionals likely implies the lower and the upper limit of the experimental value. Lastly, we confirm the dynamical stability of the crystal structure by the calculated phonon dispersion relation.

Place, publisher, year, edition, pages
2014. Vol. 261, 17-20 p.
Keyword [en]
Mg-ion batteries, First-principle calculations, Hybrid functionals, Molecular dynamics
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Other Physics Topics
URN: urn:nbn:se:kth:diva-148604DOI: 10.1016/j.ssi.2014.03.023ISI: 000338819500004ScopusID: 2-s2.0-84899025061OAI: diva2:737189
Swedish Research Council, 2012-4379

QC 20140812

Available from: 2014-08-12 Created: 2014-08-11 Last updated: 2014-08-12Bibliographically approved

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Ahuja, Rajeev
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