Chemical state of iron of LiFePO4 during charge-discharge cycles studied by in-situ X-ray absorption spectroscopy

  • Inoue Katsuya
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Fujieda Shun
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Shinoda Kozo
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Suzuki Shigeru
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Waseda Yoshio
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

書誌事項

タイトル別名
  • Chemical State of Iron of LiFePO<SUB>4</SUB> during Charge-Discharge Cycles Studied by <I>In-Situ</I> X-ray Absorption Spectroscopy

この論文をさがす

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 LiFePO4, 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 heterogeneous electrochemical reactions in electrode materials during charge-discharge cycles.

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 51 (12), 2220-2224, 2010

    公益社団法人 日本金属学会

被引用文献 (1)*注記

もっと見る

参考文献 (25)*注記

もっと見る

関連プロジェクト

もっと見る

詳細情報

問題の指摘

ページトップへ