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Article

Laboratory Operando XAS Study of Sodium Iron Titanite Cathode in the Li-Ion Half-Cell

1
The Smart Materials Research Institute, Southern Federal University, 178/24 A. Sladkova Street, 344090 Rostov-on-Don, Russia
2
Department of Chemistry, Southern Federal University, 7 Zorge Street, 344090 Rostov-on-Don, Russia
*
Authors to whom correspondence should be addressed.
Nanomaterials 2021, 11(1), 156; https://doi.org/10.3390/nano11010156
Received: 10 December 2020 / Revised: 5 January 2021 / Accepted: 7 January 2021 / Published: 9 January 2021
Electrochemical characterization of the novel sodium iron titanate Na0.9Fe0.45Ti1.55O4 was performed upon cycling in the Li-ion half-cell. The material exhibited stable cycling in the voltage range 2–4.5 V, and the number of alkali ions extracted per formula unit was approximately half of the Na stoichiometry value. Using laboratory X-ray absorption spectrometry, we measured operando Fe K-edge X-ray absorption spectra in the first 10 charge–discharge cycles and quantified the portion of charge associated with the transition metal redox reaction. Although 3d metals are commonly accepted redox-active centers in the intercalation process, we found that in all cycles the amount of oxidized and reduced Fe ions was almost 20% less than the total number of transferred electrons. Using density functional theory (DFT) simulations, we show that part of the reversible capacity is related to the redox reaction on oxygen ions. View Full-Text
Keywords: Na-ion; cathode material; sodium iron titanate; operando study; X-ray absorption spectroscopy; DFT calculations Na-ion; cathode material; sodium iron titanate; operando study; X-ray absorption spectroscopy; DFT calculations
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MDPI and ACS Style

Shapovalov, V.; Guda, A.; Butova, V.; Shukaev, I.; Soldatov, A. Laboratory Operando XAS Study of Sodium Iron Titanite Cathode in the Li-Ion Half-Cell. Nanomaterials 2021, 11, 156. https://doi.org/10.3390/nano11010156

AMA Style

Shapovalov V, Guda A, Butova V, Shukaev I, Soldatov A. Laboratory Operando XAS Study of Sodium Iron Titanite Cathode in the Li-Ion Half-Cell. Nanomaterials. 2021; 11(1):156. https://doi.org/10.3390/nano11010156

Chicago/Turabian Style

Shapovalov, Victor, Alexander Guda, Vera Butova, Igor Shukaev, and Alexander Soldatov. 2021. "Laboratory Operando XAS Study of Sodium Iron Titanite Cathode in the Li-Ion Half-Cell" Nanomaterials 11, no. 1: 156. https://doi.org/10.3390/nano11010156

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