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Improving cycling performance of the NaNiO2 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 NaNi0.5Mn0.5O2, 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 (LiNiO2), NaNiO2 (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 NaNi0.9Ti0.1O2 (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 g1 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

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 Dimensions
OpenAlex
Scopus
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie

Verlagsausgabe §
DOI: 10.5445/IR/1000173697
Veröffentlicht am 26.08.2024
Originalveröffentlichung
DOI: 10.1088/2752-5724/ad5faa
Scopus
Zitationen: 6
Dimensions
Zitationen: 6
Seitenaufrufe: 72
seit 26.08.2024
Downloads: 28
seit 02.09.2024
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