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Degradation Mechanisms in Li2VO2F Li-Rich Disordered Rock-Salt Cathodes
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0001-5641-7778
Helmholtz Inst Ulm, Helmholtzstr 11, D-89081 Ulm, Germany.ORCID iD: 0000-0002-1512-2735
Helmholtz Inst Ulm, Helmholtzstr 11, D-89081 Ulm, Germany.
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2019 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 31, no 16, p. 6084-6096Article in journal (Refereed) Published
Abstract [en]

The increased energy density in Li-ion batteries is particularly dependent on the cathode materials that so far have been limiting the overall battery performance. A new class of materials, Li-rich disordered rock salts, has recently been brought forward as promising candidates for next-generation cathodes because of their ability to reversibly cycle more than one Li-ion per transition metal. Several variants of these Li-rich cathode materials have been developed recently and show promising initial capacities, but challenges concerning capacity fade and voltage decay during cycling are yet to be overcome. Mechanisms behind the significant capacity fade of some materials must be understood to allow for the design of new materials in which detrimental reactions can be mitigated. In this study, the origin of the capacity fade in the Li-rich material Li2VO2F is investigated, and it is shown to begin with degradation of the particle surface that spreads inward with continued cycling.

Place, publisher, year, edition, pages
2019. Vol. 31, no 16, p. 6084-6096
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-394265DOI: 10.1021/acs.chemmater.9b00829ISI: 000483435400005OAI: oai:DiVA.org:uu-394265DiVA, id: diva2:1359475
Funder
Swedish Research Council, 2016-03545EU, Horizon 2020, 711792EU, Horizon 2020, 730872StandUpSwedish National Infrastructure for Computing (SNIC)Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-09Bibliographically approved

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Källquist, IdaNaylor, Andrew J.Kullgren, JollaEdström, KristinaBrandell, DanielHahlin, Maria

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