Development of <i>in situ</i> Soft X-Ray Absorption Spectroscopy Technique for Light Element Analysis in Lithium Ion Secondary Batteries

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  • NAKANISHI Koji
    The SR Center, Ritsumeikan University Office of Society-Academia Collaboration for Innovation, Kyoto University
  • TANIDA Hajime
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • KOMATSU Hideyuki
    Office of Society-Academia Collaboration for Innovation, Kyoto University Advanced Materials Laboratory, Nissan Motor Co., Ltd.
  • TAKAHASHI Ikuma
    Office of Society-Academia Collaboration for Innovation, Kyoto University Advanced Materials Laboratory, Nissan Motor Co., Ltd.
  • TAMENORI Yusuke
    Japan Synchrotron Radiation Research Institute/SPring-8
  • TSURUTA Kazuki
    Japan Synchrotron Radiation Research Institute/SPring-8
  • YAJI Toyonari
    The SR Center, Ritsumeikan University
  • YOSHIMURA Masashi
    The SR Center, Ritsumeikan University
  • YAMANAKA Keisuke
    The SR Center, Ritsumeikan University
  • KIKUZAKI Shota
    Department of Life Sciences, Ritsumeikan University
  • ORIKASA Yuki
    Department of Life Sciences, Ritsumeikan University Graduate School of Human and Environmental Studies, Kyoto University
  • KOJIMA Kazuo
    Department of Life Sciences, Ritsumeikan University
  • YAMAMOTO Kentaro
    Graduate School of Human and Environmental Studies, Kyoto University
  • UCHIMOTO Yoshiharu
    Graduate School of Human and Environmental Studies, Kyoto University
  • OGUMI Zempachi
    Office of Society-Academia Collaboration for Innovation, Kyoto University
  • OHTA Toshiaki
    The SR Center, Ritsumeikan University

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Other Title
  • リチウムイオン二次電池中軽元素成分観察のためのその場軟X線吸収分光技術の開発
  • リチウムイオン ニジ デンチ チュウ ケイゲンソ セイブン カンサツ ノ タメ ノ ソノ ジョウナンXセン キュウシュウ ブンコウ ギジュツ ノ カイハツ

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Abstract

<p>A spectro-electrochemical cell was developed for in situ soft X-ray absorption spectroscopy (SX-XAS) to investigate the non-equilibrium states of light elements in lithium ion secondary batteries (LIBs). Operando SX-XAS experiments were performed during charge/discharge processes for three cases: (1) a LiFePO4 positive electrode, (2) an amorphous silicon (a-Si) thin film negative electrode, and (3) a fluoroethylene carbonate (FEC) additive. For the case (1), P K-edge XAS spectral changes indicated the local structural change of a PO4 cage, associated with a redox reaction of Fe2+/Fe3+. For the case (2), Si K-edge XAS spectral changes exhibited the reversible LixSi alloying/dealloying reactions with the formation of a small amount of irreversible Si compounds. For the case (3), F K-edge XAS spectra showed the formation of decomposed products of the FEC additive by X-ray radiation damage, instead of the formation of passive films on the electrode.</p>

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