In situ sulfur K-edge X-ray absorption near edge structure of an embedded pyrite particle electrode in a non-aqueous Li+-based electrolyte solution

Dana A. Totir, Mark R. Antonio, Paul Schilling, Roland Tittsworth, Daniel Alberto Scherson*

*この研究の対応する著者

研究成果: Article査読

19 被引用数 (Scopus)

抄録

Changes in the composition of embedded pyrite (FeS2) particle electrodes in 1 M LiClO4 propylene carbonate solutions as a function of the applied potential have been examined in situ by S K-edge fluorescence X-ray absorption near edge structure (XANES), using a specially designed cell that minimizes attenuation of low energy X-rays. Pyrite electrodes that had been scanned from 3.0 V versus Li/Li+, i.e. close to the open circuit voltage, down to 1.0 V (fully discharged state, i.e. 4e--reduction) and then half recharged (2e--reoxidation) by scanning the potential in the positive direction up to 2.2 V versus Li/Li+, revealed features consistent with the presence of Li2FeS2, in agreement with in situ Fe K-edge results reported earlier by this research group. Moreover, only subtle changes were discerned between the in situ S K-edge XANES of the half-, and fully-recharged electrodes. This close resemblance may reflect similarities between the spectral signatures of Li2FeS2 and Fe1-xS (pyrrhotite), which is the main product of the discharge reaction. Evidence for the formation of elemental sulfur and Li2S, which are believed to be minor products of the reaction, was obtained from analysis of the first differential S XANES and selected difference spectra. The compositional variations of the embedded pyrite particles throughout the course of the electrochemical processes occur in the presence of a persistent sulfate coating.

本文言語English
ページ(範囲)3195-3200
ページ数6
ジャーナルElectrochimica Acta
47
19
DOI
出版ステータスPublished - 2002 7月 27
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 電気化学

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