Development of a Polychromatic Simultaneous Wavelength Dispersive XRF Spectrometer and Its Application to Chemical State Analysis for Cathode Materials in Lithium-ion Batteries

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  • YONEDA Tetsuya
    X-ray/Surface Business Unit, Analytical & Measuring Instruments Division, Shimadzu Corporation
  • OMORI Takashi
    Advanced Analysis Unit, Technology Research Laboratory, Shimadzu Corporation
  • SATO Kenji
    Advanced Analysis Unit, Technology Research Laboratory, Shimadzu Corporation
  • KOBAYASHI Misako
    Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST)
  • TANAKA Hideaki
    Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST)
  • YANAGIDA Masahiro
    Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST)

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Other Title
  • 同時多波長分散型蛍光X線分析装置の開発及びリチウムイオン電池正極材の状態分析への応用
  • ドウジ タハチョウ ブンサンガタ ケイコウ Xセン ブンセキ ソウチ ノ カイハツ オヨビ リチウムイオン デンチ セイキョクザイ ノ ジョウタイ ブンセキ エ ノ オウヨウ

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Abstract

<p>Lithium-ion batteries (LIBs) have been improved to achieve higher energy density and a longer life cycle. State analysis of each element in LIBs helps to understand the reaction mechanism and causes of degradation. In order to conduct in-house state analysis of cathode materials in LIB, we have developed a new type of wavelength dispersive X-ray fluorescence spectrometer. The spectrometer simultaneously detects the X-ray spectrum from 6 keV to 8 keV without mechanical scanning. The system precisely identifies fluorescent X-rays of chemical shifts; the precision is around 0.1 eV. The spectrometer detected slight chemical shifts in some types of manganese materials with different valence. Moreover, for Li(Ni0.5Co0.2Mn0.3)O2, a typical cathode active material used in LIBs, the system successfully confirmed that the changes in the valence during the charge and discharge cycle was high for nickel, but low for cobalt.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 69 (9), 471-479, 2020-09-05

    The Japan Society for Analytical Chemistry

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