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Improving cycling performance of the NaNiO$_2$ cathode in sodium-ion batteries by titanium substitution

An, Siyu 1; Karger, Leonhard 1; Dreyer, Sören L. 1; Hu, Yang; Barbosa, Eduardo 1; Zhang, Ruizhuo 1; Lin, Jing 1; Fichtner, Maximilian 2; Kondrakov, Aleksandr 1; Janek, Jürgen 1; Brezesinski, Torsten ORCID iD icon 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)

Abstract:

O3-type layered oxide cathodes, such as NaNi$_{0.5}$Mn$_{0.5}$O$_{2}$, have garnered significant attention due to their high theoretical specific capacity while using abundant and low-cost sodium as intercalation species. Unlike the lithium analog (LiNiO$_{2}$), NaNiO$_{2}$ (NNO) exhibits poor electrochemical performance resulting from structural instability and inferior Coulomb efficiency. To enhance its cyclability for practical application, NNO was modified by titanium substitution to yield the O3-type NaNi$_{0.9}$Ti$_{0.1}$O$_2$ (NNTO), which was successfully synthesized for the first time via a solid-state reaction. The mechanism behind its superior performance in
comparison to that of similar materials is examined in detail using a variety of characterization techniques. NNTO delivers a specific discharge capacity of ∼190 mAh g$^{−1}$ and exhibits good reversibility, even in the presence of multiple phase transitions during cycling in a potential window of 2.0−4.2 V vs. Na$^+$/Na. This behavior can be attributed to the substituent, which helps maintain a larger interslab distance in the Na-deficient phases and to mitigate Jahn–Teller activity by reducing the average oxidation state of nickel. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000173697
Veröffentlicht am 26.08.2024
Originalveröffentlichung
DOI: 10.1088/2752-5724/ad5faa
Scopus
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.09.2024
Sprache Englisch
Identifikator ISSN: 2752-5724
KITopen-ID: 1000173697
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Materials Futures
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 3
Heft 3
Seiten 035103
Vorab online veröffentlicht am 25.07.2024
Nachgewiesen in Scopus
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Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie
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