Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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In Situ X-ray Absorption Spectroscopic Study for α-MoO3 Electrode upon Discharge/Charge Reaction in Lithium Secondary Batteries

  • Kang, Joo-Hee (Center for Intelligent Nano-Bio Materials (CIMBN), Department of Chemistry and Nanoscience, and Department of Bioinspired Science, Ewha Womans University) ;
  • Paek, Seung-Min (Department of Chemistry, Kyungpook National University) ;
  • Choy, Jin-Ho (Center for Intelligent Nano-Bio Materials (CIMBN), Department of Chemistry and Nanoscience, and Department of Bioinspired Science, Ewha Womans University)
  • Received : 2010.08.21
  • Accepted : 2010.10.09
  • Published : 2010.12.20
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Abstract

In-situ X-ray absorption spectroscopy (XAS) was used to elucidate the structural variation of $\alpha-MoO_3$ electrode upon discharge/charge reaction in a lithium ion battery. According to the XAS analysis, hexavalent Mo atoms in $\alpha-MoO_3$ framework are reduced as the amount of intercalated lithium ions increases. As lithium de-intercalation proceeds, most of pre-edge peaks are restored again. However, according to the Fourier transforms of the extended X-ray absorption fine structure (EXAFS) spectra, lithium de-intercalation reaction is partially irreversible upon the charge reaction, which is one of the main reasons why the capacity of $\alpha-MoO_3$ electrode decreases upon successive discharge/charge cycles.

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