Epitaxial nickel rerrocyanide stabilizes Jahn–Teller distortions of manganese ferrocyanide for sodium‐ion batteries

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dc.contributor.authorGebert, Fen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorBouwer, JCen_AU
dc.contributor.authorWang, Wen_AU
dc.contributor.authorYan, Zen_AU
dc.contributor.authorDou, SXen_AU
dc.contributor.authorChou, SLen_AU
dc.date.accessioned2024-02-23T03:11:24Zen_AU
dc.date.available2024-02-23T03:11:24Zen_AU
dc.date.issued2021-06-06en_AU
dc.date.statistics2024-02-23en_AU
dc.description.abstractManganese‐based Prussian Blue, Na2−δMn[Fe(CN)6] (MnPB), is a good candidate for sodium‐ion battery cathode materials due to its high capacity. However, it suffers from severe capacity decay during battery cycling due to the destabilizing Jahn–Teller distortions it undergoes as Mn2+ is oxidized to Mn3+. Herein, the structure is stabilized by a thin epitaxial surface layer of nickel‐based Prussian Blue (Na2−δNi[Fe(CN)6]). The one‐pot synthesis relies on a chelating agent with an unequal affinity for Mn2+ and Ni2+ ions, which prevents Ni2+ from reacting until the Mn2+ is consumed. This is a new and simpler synthesis of core–shell materials, which usually needs several steps. The material has an electrochemical capacity of 93 mA h g−1, of which it retains 96 % after 500 charge–discharge cycles (vs. 37 % for MnPB). Its rate capability is also remarkable: at 4 A g−1 (ca. 55 C) it can reversibly store 70 mA h g−1, which is also reflected in its diffusion coefficient of ca. 10−8 cm2 s−1. The epitaxial outer layer appears to exert an anisotropic strain on the inner layer, preventing the Jahn–Teller distortions it normally undergoes during de‐sodiation. © 1999-2024 John Wiley & Sons, Incen_AU
dc.description.sponsorshipThis work is supported by Australian Research Council (ARC DP160102627) and the Australian Renewable Energy Agency (ARENA S4) projects, the National Natural Science Foundation of China (Grant Nos. 11704114, 61427901, 51971124), the Hunan Provincial Natural Science Foundation of China (Grant No. 2018JJ3110), the Scientific Research Fund of the Hunan Provincial Education Department of China (Grant No. 17C0462), and a China Postdoctoral Science Foundation Funded Project (Grant No. 2017M620872). The authors would like to thank Dr. Gilberto Casillas-Garcia for the STEM technique support and Dr. Tania Silver for critical reading of the manuscript. Parts of the experiments were carried out at the Powder Diffraction Beamline, Australian Synchrotron, and parts of the experiments were carried out at the P64 beamline at the DESY Synchrotron, Hamburg, Germany.en_AU
dc.format.mediumPrint-Electronicen_AU
dc.identifier.citationGebert, F., Cortie, D. L., Bouwer, J. C., Wang, W., Yan, Z., Dou, S.-X., & Chou, S.-L. (2021). Epitaxial nickel rerrocyanide stabilizes Jahn–Teller distortions of manganese ferrocyanide for sodium‐ion batteries. Angewandte Chemie International Edition, 60(34), 18519-18526. doi:10.1002/anie.202106240en_AU
dc.identifier.issn1433-7851en_AU
dc.identifier.issn1521-3773en_AU
dc.identifier.issue34en_AU
dc.identifier.journaltitleAngewandte Chemie International Editionen_AU
dc.identifier.pagination18519-18526en_AU
dc.identifier.urihttp://dx.doi.org/10.1002/anie.202106240en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15419en_AU
dc.identifier.volume60en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherWileyen_AU
dc.subjectNickelen_AU
dc.subjectFerrocyanidesen_AU
dc.subjectJahn-Teller effecten_AU
dc.subjectManganeseen_AU
dc.subjectSodium ionsen_AU
dc.subjectElectric batteriesen_AU
dc.subjectCoatingsen_AU
dc.subjectCathodesen_AU
dc.titleEpitaxial nickel rerrocyanide stabilizes Jahn–Teller distortions of manganese ferrocyanide for sodium‐ion batteriesen_AU
dc.typeJournal Articleen_AU
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