Supervalent doping and its effect on the thermal, structural and electrochemical properties of Li7La3Zr2O12 solid electrolytes

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKošir, Janezen_US
dc.contributor.authorMousavihashemi, Seyedabolfazlen_US
dc.contributor.authorSuominen, Millaen_US
dc.contributor.authorKobets, Annaen_US
dc.contributor.authorWilson, Benjamin P.en_US
dc.contributor.authorRautama, Eeva-Leenaen_US
dc.contributor.authorKallio, Tanjaen_US
dc.contributor.departmentDepartment of Chemistry and Materials Scienceen
dc.contributor.departmentDepartment of Chemical and Metallurgical Engineeringen
dc.contributor.groupauthorElectrochemical Energy Conversionen
dc.contributor.groupauthorHydrometallurgy and Corrosionen
dc.date.accessioned2024-08-06T07:48:25Z
dc.date.available2024-08-06T07:48:25Z
dc.date.issued2024-06-21en_US
dc.descriptionPublisher Copyright: © 2024 RSC.
dc.description.abstractSupervalent doping is one of the most common methods used to stabilize the highly conductive cubic phase of Li7La3Zr2O12 (LLZO) solid electrolytes. While several different doping elements have shown that they are capable of stabilizing the cubic LLZO structure, there is still no clear consensus as to an optimal doping strategy. In this study we present one of the most extensive comparative analyses on supervalent doping of LLZO done to date. Herein, we compare the effects of eight different doping elements (Al, Ga, Fe, Ta, Nb, Sb, W and Mo) on the synthesis, crystal structure, morphology, and electrochemical properties of LLZO. We also propose a new guideline that would allow for the quick and easy identification of doping elements in LLZO and the estimation of their concentration using Raman spectroscopy. Our results show how Ga doping leads to exceptionally high ionic conductivities (1.30 × 10−3 S cm−1) and low activation energies (0.26 eV) due to changes in the crystal symmetry of LLZO. On top of that, Ga doping also significantly lowers the required synthesis temperatures and increases the relative density of the LLZO structure, making Ga the most suitable element for LLZO doping. On the other hand, Nb doping shows the lowest ionic conductivity (1.91 × 10−4 S cm−1) and a high activation energy (0.44 eV) of the investigated dopants, due to a poor sintering performance.en
dc.description.versionPeer revieweden
dc.format.extent15
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationKošir, J, Mousavihashemi, S, Suominen, M, Kobets, A, Wilson, B P, Rautama, E-L & Kallio, T 2024, ' Supervalent doping and its effect on the thermal, structural and electrochemical properties of Li 7 La 3 Zr 2 O 12 solid electrolytes ', Materials Advances, vol. 5, no. 12, pp. 5260-5274 . https://doi.org/10.1039/d4ma00119ben
dc.identifier.doi10.1039/d4ma00119ben_US
dc.identifier.issn2633-5409
dc.identifier.otherPURE UUID: 852307ac-c33d-4da4-ae5d-e124756e67e9en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/852307ac-c33d-4da4-ae5d-e124756e67e9en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85193834212&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/150710849/CHEM_Kosir_et_al_Supervalent_doping_2024_Materials_Advances.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/129694
dc.identifier.urnURN:NBN:fi:aalto-202408065267
dc.language.isoenen
dc.publisherRoyal Society of Chemistry
dc.relation.ispartofseriesMaterials Advances
dc.relation.ispartofseriesVolume 5, issue 12, pp. 5260-5274
dc.rightsopenAccessen
dc.titleSupervalent doping and its effect on the thermal, structural and electrochemical properties of Li7La3Zr2O12 solid electrolytesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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