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Unfolding the Mechanism of Sodium Insertion in Anatase TiO 2 Nanoparticles

Unfolding the Mechanism of Sodium Insertion in Anatase TiO 2 Nanoparticles It is frequently assumed that sodium‐ion battery chemistry exhibits a behavior that is similar to the more frequently investigated lithium‐ion chemistry. However, in this work it is shown that there are great, and rather surprising, differences, at least in the case of anatase TiO2. While the generally more reducing lithium ion is reversibly inserted in the anatase TiO2 lattice, sodium ions appear to partially reduce the rather stable oxide and form metallic titanium, sodium oxide, and amorphous sodium titanate, as revealed by means of in situ X‐ray diffraction, ex situ X‐ray photoelectron spectroscopy, scanning electron microscopy, and Raman spectroscopy. Nevertheless, once the electrochemical transformation of anatase TiO2 is completed, the newly formed material presents a very stable long‐term cycling performance, excellent high rate capability, and superior coulombic efficiency, highlighting it as a very promising anode material for sodium‐ion battery applications. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

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References (49)

Publisher
Wiley
Copyright
Copyright © 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.201401142
Publisher site
See Article on Publisher Site

Abstract

It is frequently assumed that sodium‐ion battery chemistry exhibits a behavior that is similar to the more frequently investigated lithium‐ion chemistry. However, in this work it is shown that there are great, and rather surprising, differences, at least in the case of anatase TiO2. While the generally more reducing lithium ion is reversibly inserted in the anatase TiO2 lattice, sodium ions appear to partially reduce the rather stable oxide and form metallic titanium, sodium oxide, and amorphous sodium titanate, as revealed by means of in situ X‐ray diffraction, ex situ X‐ray photoelectron spectroscopy, scanning electron microscopy, and Raman spectroscopy. Nevertheless, once the electrochemical transformation of anatase TiO2 is completed, the newly formed material presents a very stable long‐term cycling performance, excellent high rate capability, and superior coulombic efficiency, highlighting it as a very promising anode material for sodium‐ion battery applications.

Journal

Advanced Energy MaterialsWiley

Published: Jan 1, 2015

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