Chemical state of Iron of LiFePO4during charge-discharge cycles studied by in-situ X-ray absorption spectroscopy

Katsuya Inoue, Shun Fujieda, Kozo Shinoda, Shigeru Suzuki, Yoshio Waseda

研究成果: Article査読

17 被引用数 (Scopus)

抄録

In-situ X-ray absorption spectroscopy (XAS) at the Fe K-edge X-ray absorption near edge was used to investigate the chemical change of LiFePO 4, which is a candidate cathode material for lithium ion batteries, during charge-discharge cycles. The relative amount of FePO4 formed in the LiFePO4 by the charge-discharge cycles was estimated from the XAS spectra. The results show that the amount Of FePO4 in the LiFePO4 increased with charging and decreased with discharging. While a linear relationship between the relative amount of FePO4 and electrical capacity was observed during the initial charging, it deviated from linearity during the charge-discharge cycles. This may be attributed to the irreversible diffusion paths of lithium ions and/or the partial formation of inactive FePO4 in the LiFePO4 during the charge-discharge cycles. It is shown that in-situ XAS has sufficient potential to nondestructively characterize heteroseneous electrochemical reactions in electrode materials during charge-discharge cycles.

本文言語English
ページ(範囲)2220-2224
ページ数5
ジャーナルMaterials Transactions
51
12
DOI
出版ステータスPublished - 2010 12月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

フィンガープリント

「Chemical state of Iron of LiFePO4during charge-discharge cycles studied by in-situ X-ray absorption spectroscopy」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル