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Unveiling the correlation between structural alterations and enhanced high‐voltage cyclability in Na‐deficient P3‐type layered cathode materials via Li incorporation

Yang, Xiaoxia; Wang, Suning; Li, Hang; Tseng, Jochi; Wu, Zhonghua; Indris, Sylvio ORCID iD icon 1; Ehrenberg, Helmut 1; Guo, Xiaodong ; Hua, Weibo
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)

Abstract:

With exceptional capacity during high-voltage cycling, P3-type Na-deficient layered oxide cathodes have captured substantial attention. Nevertheless, they are plagued by severe capacity degradation over cycling. In this study, tuning and optimizing the phase composition in layered oxides through Li incorporation are proposed to enhance the high-voltage stability. The structural dependence of layered Na2/3LixNi0.25Mn0.75O2+δ oxides on the lithium content (0.0 ≤ x ≤ 1.0) offered during synthesis is investigated systematically on an atomic scale. Surprisingly, increasing the Li content triggers the formation of mixed P2/O3-type or P3/P2/O3-type layered phases. As the voltage window is 1.5–4.5 V, P3-type Na2/3Ni0.25Mn0.75O2 (NL0.0NMO, R
m) material exhibits a sequence of phase transformations throughout the process of (de)sodiation, that is, O3⇌P3⇌O3′⇌O3″. Such complicated phase transitions can be effectively suppressed in the Na2/3Li0.7Ni0.25Mn0.75O2.4 (NL0.7NMO) oxide with P2/P3/O3-type mixed phases. Consequently, cathodes made of NL0.7NMO exhibit a substantially enhanced cyclic performance at high voltages compared to that of the P3-type layered NL0.0NMO cathode. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000174254
Veröffentlicht am 16.09.2024
Originalveröffentlichung
DOI: 10.1002/elt2.18
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2024
Sprache Englisch
Identifikator ISSN: 2751-2606, 2751-2614
KITopen-ID: 1000174254
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Electron
Verlag John Wiley and Sons
Band 2
Heft 1
Seiten Art.-Nr. e18
Vorab online veröffentlicht am 12.01.2024
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