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Probing the Effect of Titanium Substitution on the Sodium Storage in Na₃Ni₂BiO₆ Honeycomb-Type Structure

Zemlyanushin, Eugen; Pfeifer, Kristina; Sarapulova, Angelina; Etter, Martin; Ehrenberg, Helmut; Dsoke, Sonia

Na$_{3}$Ni$_{2}$BiO$_{6}$ with Honeycomb structure suffers from poor cycle stability when applied as cathode material for sodium-ion batteries. Herein, the strategy to improve the stability is to substitute Ni and Bi with inactive Ti. Monoclinic Na$_{3}$Ni$_{2-x}$Bi$_{1-y}$Ti$_{x+y}$O$_{6}$ powders with different Ti content were successfully synthesized via sol gel method, and 0.3 mol of Ti was determined as a maximum concentration to obtain a phase-pure compound. A solid-solution in the system of O3-NaNi$_{0.5}$Ti$_{0.5}$O$_{2}$ and O3-Na$_{3}$Ni$_{2}$BiO$_{6}$ is obtained when this critical concentration is not exceeded. The capacity of the first desodiation process at 0.1 C of Na$_{3}$Ni$_{2}$BiO$_{6}$ (~93 mAh g$^{-1}$) decreases with the increasing Ti concentration to ~77 mAh g$^{-1}$ for Na$_{3}$Ni$_{2}$Bi$_{0.9}$Ti$_{0.1}$O$_{6}$ and to ~82 mAh g$^{-1}$ for Na$_{3}$Ni$_{Zahl0.9}$Bi$_{0.8}$Ti$_{0.3}$O$_{6}$, respectively. After 100 cycles at 1 C, a better electrochemical kinetics is obtained for the Ti-containing structures, where a fast diffusion effect of Na$^{+}$-ions is more pronounced. As a result of in operando synchrotron radiation diffraction, during the first sodiation (O1-P3-O’3-O3) the O’3 phase, which is formed in the Na$_{3}$Ni$_{2}$BiO$_{6}$ is fully or partly replaced by P’3 phase in the Ti substituted compounds. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000127872
Veröffentlicht am 18.12.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Helmholtz-Institut Ulm (HIU)
Post Lithium Storage (POLiS)
Institut für Angewandte Materialien (IAM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000127872
HGF-Programm 37.01.12 (POF III, LK 01) Intercalation
Erschienen in Energies
Verlag MDPI
Band 13
Heft 24
Seiten Article: 6498
Vorab online veröffentlicht am 09.12.2020
Schlagwörter sodium-ion batteries; honeycomb-layer; solid-solution; cathode material
Nachgewiesen in Web of Science
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