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Evaluating bulk Nb2O2F3 for Li-battery electrode applications
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik. Uppsala universitet, Sweden.
2016 (Engelska)Ingår i: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 18, nr 5, s. 3530-3535Artikel i tidskrift (Refereegranskat) Published
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Abstract [en]

This investigation has the primary objective of elucidating the lithium intercalation process in the crystal structure of a new niobium oxyfluoride compound Nb2O2F3. The framework of the density functional theory was applied in a generalized gradient approximation together with the hybrid functional method. It is revealed that lithium atoms intercalate in this material in a maximum concentration of one Li atom per formula unit forming LiNb2O2F3. Moreover, octahedral positions in between the layers of Nb-O-F appear as the Li preferred occupancy resulting in a structural volume expansion of only 5%. Electronic structure evolution with the insertion of lithium displays a transformation from semi-conductor to metal when half of the lithium atoms are added. This transformation occurs due to a symmetry break induced by the transition from the + 8 to + 7 oxidation state of half of the Nb2 dimers. Then, after full lithiation the symmetry is recovered and the material becomes a semiconductor again with a band gap amounting to 1 eV. The evaluated average deintercalation potential reaches 1.29 V vs. Li/Li+ with activation energy for lithium ion migration of 0.79 eV. The computed low potential of the redox reaction Nb-2(8+) to Nb-2(7+) includes niobium oxyfluoride in the map of possible materials for the anode application of Li-ion batteries.

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Royal Society of Chemistry, 2016. Vol. 18, nr 5, s. 3530-3535
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URN: urn:nbn:se:kth:diva-183191DOI: 10.1039/c5cp06829kISI: 000369508100020PubMedID: 26751421Scopus ID: 2-s2.0-84956939620OAI: oai:DiVA.org:kth-183191DiVA, id: diva2:908924
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Tillgänglig från: 2016-03-03 Skapad: 2016-03-03 Senast uppdaterad: 2017-11-30Bibliografiskt granskad

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