Critical role of Ti4+ in stabilizing high-voltage redox reactions in Li-rich layered material

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dc.contributor.authorCho, Men_AU
dc.contributor.authorSong, SHen_AU
dc.contributor.authorHong, Sen_AU
dc.contributor.authorKim, KSen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorYoo, JGen_AU
dc.contributor.authorKo, KTen_AU
dc.contributor.authorHong, Jen_AU
dc.contributor.authorKim, Jen_AU
dc.contributor.authorLee, Sen_AU
dc.contributor.authorKim, Hen_AU
dc.date.accessioned2021-09-21T23:02:30Zen_AU
dc.date.available2021-09-21T23:02:30Zen_AU
dc.date.issued2021-07-01en_AU
dc.date.statistics2021-09-14en_AU
dc.description.abstractLi-rich layered oxide materials are considered promising candidates for high-capacity cathodes for battery applications and improving the reversibility of the anionic redox reaction is the key to exploiting the full capacity of these materials. However, permanent structural change of the electrode occurring upon electrochemical cycling results in capacity and voltage decay. In view of these factors, Ti4+-substituted Li2IrO3 (Li2Ir0.75Ti0.25O3) is synthesized, which undergoes an oxygen redox reaction with suppressed voltage decay, yielding improved electrochemical performance and good capacity retention. It is shown that the increased bond covalency upon Ti4+ substitution results in structural stability, tuning the phase stability from O3 to O1′ upon de-lithiation during charging compared with O3 to T3 and O1 for pristine Li2IrO3, thereby facilitating the oxidation of oxygen. This work unravels the role of Ti4+ in stabilizing the cathode framework, providing insight for a fundamental design approach for advanced Li-rich layered oxide battery materials.© 2021 Wiley-VCH GmbHen_AU
dc.identifier.articlenumber2100840en_AU
dc.identifier.citationCho, M., Song, S. H., Hong, S., Kim, K. S., Avdeev, M., Yoo, J.-G., Ko, K.-T., Hong, J., Kim, J., Lee, S., & Kim, H. (2021). Critical role of Ti4+ in stabilizing high-voltage redox reactions in Li-rich layered material. Small, 17(32), 2100840. doi:10.1002/smll.202100840en_AU
dc.identifier.issn1613-6829en_AU
dc.identifier.issue32en_AU
dc.identifier.journaltitleSmallen_AU
dc.identifier.urihttps://doi.org/10.1002/smll.202100840en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11764en_AU
dc.identifier.volume17en_AU
dc.language.isoenen_AU
dc.publisherWileyen_AU
dc.subjectOxidesen_AU
dc.subjectCathodesen_AU
dc.subjectRedox reactionsen_AU
dc.subjectElectrodesen_AU
dc.subjectElectrochemistryen_AU
dc.subjectLithium ion batteriesen_AU
dc.titleCritical role of Ti4+ in stabilizing high-voltage redox reactions in Li-rich layered materialen_AU
dc.typeJournal Articleen_AU
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