A comparative study of polarization during the initial lithiation step in tungsten-oxide negative electrodes for lithium-ion batteries

A comparative study of polarization during the initial lithiation step in tungsten-oxide negative... In this study, polarization behavior during initial lithiation step was comparatively investigated using a tungsten oxide (WO3) and its reduced one (WO3−x). Ex-situ X-ray diffraction revealed that the overall lithiation process in WO3 was mostly similar to that of WO3−x, which was associated with the typical conversion reaction of transition-metal oxide. In the WO3−x anode, however, insertional lithiation was initiated above 2V vs. Li/Li+ and a following conversion reaction was observed, which was different charging behavior from WO3 electrode. The severe polarization related with the conversion reaction was alleviated owing to the high electrical conductivity in the mixed-valance state of WO3−x. Furthermore, the different initial polarization in WO3−x anode resulted in the improvement of cycle performance and efficiency. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

A comparative study of polarization during the initial lithiation step in tungsten-oxide negative electrodes for lithium-ion batteries

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2017.09.004
Publisher site
See Article on Publisher Site

Abstract

In this study, polarization behavior during initial lithiation step was comparatively investigated using a tungsten oxide (WO3) and its reduced one (WO3−x). Ex-situ X-ray diffraction revealed that the overall lithiation process in WO3 was mostly similar to that of WO3−x, which was associated with the typical conversion reaction of transition-metal oxide. In the WO3−x anode, however, insertional lithiation was initiated above 2V vs. Li/Li+ and a following conversion reaction was observed, which was different charging behavior from WO3 electrode. The severe polarization related with the conversion reaction was alleviated owing to the high electrical conductivity in the mixed-valance state of WO3−x. Furthermore, the different initial polarization in WO3−x anode resulted in the improvement of cycle performance and efficiency.

Journal

Solid State IonicsElsevier

Published: Nov 15, 2017

References

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