Issue 23, 2016

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
31 ธ.ค. 2558
Accepted
13 เม.ย. 2559
First published
03 พ.ค. 2559

CrystEngComm, 2016,18, 4431-4437

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

N. Louvain, A. Henry, L. Daenens, B. Boury, L. Stievano and L. Monconduit, CrystEngComm, 2016, 18, 4431 DOI: 10.1039/C5CE02598B

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