The Structural Evolution of V2O5 Nanocrystals during Electrochemical Cycling Studied Using In operando Synchrotron Techniques

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yadong Liu
  • Cheng-Jun Sun
  • Zhe-fei Li
  • Wenquan Lu
  • Eric A. Stach
  • Jian Xie

Detail(s)

Original languageEnglish
Pages (from-to)318-322
Journal / PublicationElectrochimica Acta
Volume136
Online published26 May 2014
Publication statusPublished - 1 Aug 2014
Externally publishedYes

Abstract

The structural evolution of vanadium oxide (V2O5) nanocrystals was studied during Li+ ion intercalation and deintercalation (i.e. electrochemical discharge/charge) processes using in operando high-energy x-ray diffraction (HEXRD) and in operando x-ray adsorption near edge spectroscopy (XANES). The HEXRD results clearly show that V2O5 undergoes phase transformations during the first Li+ ion intercalation (i.e. discharge) process. The analysis of the XANES data suggests that the average oxidation state of vanadium in fully charged V2O5 nanocrystals decreases to less than +5 after the first four cycles. The combined results of the unchanged crystal structure (HEXRD) and the decreased oxidation state (XANES) lead to the conclusion that some of the Li+ ions are trapped within the V2O 5 framework and the V2O5 exists as Li0.18V2O5 instead of pure V2O 5 after the first four cycles, while the trapped Li+ ion may increase the stability of V2O5 framework.

Research Area(s)

  • vanadium oxide, Li-ion battery, synchrotron, high-energy x-ray diffraction, x-ray adsorption near edge spectroscopy

Citation Format(s)

The Structural Evolution of V2O5 Nanocrystals during Electrochemical Cycling Studied Using In operando Synchrotron Techniques. / Liu, Qi; Liu, Yadong; Sun, Cheng-Jun; Li, Zhe-fei; Ren, Yang; Lu, Wenquan; Stach, Eric A.; Xie, Jian.

In: Electrochimica Acta, Vol. 136, 01.08.2014, p. 318-322.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review