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Article

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

1
Institute for Applied Materials (IAM) Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2
Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, D-22607 Hamburg, Germany
3
Helmholtz-Institute for Electrochemical Energy Storage (HIU), P.O. Box 3640, 76021 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Energies 2020, 13(24), 6498; https://doi.org/10.3390/en13246498
Received: 23 October 2020 / Revised: 4 December 2020 / Accepted: 6 December 2020 / Published: 9 December 2020
(This article belongs to the Special Issue Novel Technologies for Metal-Ion and Metal Batteries)
Na3Ni2BiO6 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 Na3Ni2-xBi1-yTix+yO6 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-NaNi0.5Ti0.5O2 and O3-Na3Ni2BiO6 is obtained when this critical concentration is not exceeded. The capacity of the first desodiation process at 0.1 C of Na3Ni2BiO6 (~93 mAh g−1) decreases with the increasing Ti concentration to ~77 mAh g−1 for Na3Ni2Bi0.9Ti0.1O6 and to ~82 mAh g−1 for Na3Ni0.9Bi0.8Ti0.3O6, 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 Na3Ni2BiO6 is fully or partly replaced by P’3 phase in the Ti substituted compounds. This leads to an improvement in the kinetics of the electrochemical process. The pathway through prismatic sites of Na+-ions in the P’3 phase seems to be more favourable than through octahedral sites of O’3 phase. Additionally, at high potential, a partial suppression of the reversible phase transition P3-O1-P3 is revealed. View Full-Text
Keywords: sodium-ion batteries; honeycomb-layer; solid-solution; cathode material sodium-ion batteries; honeycomb-layer; solid-solution; cathode material
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MDPI and ACS Style

Zemlyanushin, E.; Pfeifer, K.; Sarapulova, A.; Etter, M.; Ehrenberg, H.; Dsoke, S. Probing the Effect of Titanium Substitution on the Sodium Storage in Na3Ni2BiO6 Honeycomb-Type Structure. Energies 2020, 13, 6498. https://doi.org/10.3390/en13246498

AMA Style

Zemlyanushin E, Pfeifer K, Sarapulova A, Etter M, Ehrenberg H, Dsoke S. Probing the Effect of Titanium Substitution on the Sodium Storage in Na3Ni2BiO6 Honeycomb-Type Structure. Energies. 2020; 13(24):6498. https://doi.org/10.3390/en13246498

Chicago/Turabian Style

Zemlyanushin, Eugen, Kristina Pfeifer, Angelina Sarapulova, Martin Etter, Helmut Ehrenberg, and Sonia Dsoke. 2020. "Probing the Effect of Titanium Substitution on the Sodium Storage in Na3Ni2BiO6 Honeycomb-Type Structure" Energies 13, no. 24: 6498. https://doi.org/10.3390/en13246498

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