On the electrochemical encounter between sodium and mesoporous anatase TiO2 as a Na-ion electrode

Abstract : Mesoporous anatase titanium dioxide (TiO2) is prepared by an easily up-scalable synthesis protocol, using relatively inexpensive precursors. We demonstrate here that submicronic anatase TiO2 crystals show unexpected performances as electrodes of Na-ion batteries (NaBs). They exhibit highly stable reversible specific capacities of up to 200 mA h g−1 and excellent cyclability at moderate current rates at an average potential of 1.0 V vs. Na+/Na. While pseudocapacitance may appear to be the main process driving the reactions between the sodium ions and TiO2 during the first discharge above 1 V vs. Na+/Na, operando Raman and X-ray diffraction studies show that the TiO2 anatase structure is nearly entirely lost below 0.25 V vs. Na+/Na. The subsequent cycling is based on amorphous sodium titanate materials.
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Contributor : Lorenzo Stievano <>
Submitted on : Wednesday, July 13, 2016 - 6:00:26 PM
Last modification on : Tuesday, May 28, 2019 - 2:06:13 PM

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Nicolas Louvain, Aurélien Henry, Léa Daenens, Bruno Boury, Lorenzo Stievano, et al.. On the electrochemical encounter between sodium and mesoporous anatase TiO2 as a Na-ion electrode. CrystEngComm, Royal Society of Chemistry, 2016, 18 (23), pp.4431-4437. ⟨10.1039/C5CE02598B⟩. ⟨hal-01345469⟩

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