Surface characterization of Li-substituted compositionally heterogeneous NaLi0.045Cu0.185Fe0.265Mn0.505O2 sodium-ion cathode material

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dc.contributor.authorRahman, MMen_AU
dc.contributor.authorZhang, Yen_AU
dc.contributor.authorXia, Sen_AU
dc.contributor.authorKan, WHen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorMu, Len_AU
dc.contributor.authorSokaras, Den_AU
dc.contributor.authorKroll, Ten_AU
dc.contributor.authorDu, XWen_AU
dc.contributor.authorNordlund, Den_AU
dc.contributor.authorLiu, Yen_AU
dc.contributor.authorLin, Fen_AU
dc.date.accessioned2021-06-03T06:54:30Zen_AU
dc.date.available2021-06-03T06:54:30Zen_AU
dc.date.issued2019-04-11en_AU
dc.date.statistics2021-04-26en_AU
dc.description.abstractThe understanding of surface chemical and structural processes can provide some insights into designing stable sodium cathode materials. Herein, Li-substituted and compositionally heterogeneous NaLi0.045Cu0.185Fe0.265Mn0.505O2 is used as a platform to investigate the interplay between Li substitution, surface chemistry, and battery performance. Li substitution improves the initial discharge capacity and energy density. However, there is no noticeable benefit in the long-term cycling stability of this material. The Li substitution in the transition-metal (TM) layer also seems to influence the transition-metal (TM) 3d–oxygen (O) 2p hybridization. Upon desodiation, the surface of active particles undergoes significant transition-metal reduction, especially Mn. Furthermore, the presence of electrolyte drastically accelerates such surface degradation. In general, the Li-substituted material experiences severe surface degradation, which is partially responsible for the performance degradation upon long-term cycling. While some studies have reported the benefits of Li substitution, the present study suggests that the effectiveness of the Li substitution strategy depends on the TM compositional distribution. More efforts are needed to improve the surface chemistry of Li-substituted sodium cathode materials. © 2019 American Chemical Societyen_AU
dc.identifier.citationRahman, M. M., Zhang, Y., Xia, S., Kan, W. H., Avdeev, M., Mu, L., Sokaras, D., Kroll, T., Du, X.-W., Nordlund, D., Liu, Y., & Lin, F. (2019). Surface characterization of Li-substituted compositionally heterogeneous NaLi0.045Cu0.185Fe0.265Mn0.505O2 sodium-ion cathode material. The Journal of Physical Chemistry C, 123(18), 11428–11435. doi:10.1021/acs.jpcc.9b01126en_AU
dc.identifier.issn1932-7455en_AU
dc.identifier.issue18en_AU
dc.identifier.journaltitleThe Journal of Physical Chemistry Cen_AU
dc.identifier.pagination11428-11435en_AU
dc.identifier.urihttps://doi.org/10.1021/acs.jpcc.9b01126en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10823en_AU
dc.identifier.volume123en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectOxidesen_AU
dc.subjectHybridizationen_AU
dc.subjectSodiumen_AU
dc.subjectTransition elementsen_AU
dc.subjectElectric batteriesen_AU
dc.subjectCathodesen_AU
dc.titleSurface characterization of Li-substituted compositionally heterogeneous NaLi0.045Cu0.185Fe0.265Mn0.505O2 sodium-ion cathode materialen_AU
dc.typeJournal Articleen_AU
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