Studies on Electrochemical Oxidation of Propylene Carbonate Electrolyte on LiMn<sub>2</sub>O<sub>4</sub> Thin Film Electrode

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  • DOKKO Kaoru
    Department of Applied Chemistry, Graduate School of Engineering, Tokyo Metropolitan University CREST, Japan Science and Technology Agency
  • MATSUSHITA Tadashi
    Department of Applied Chemistry, Graduate School of Engineering, Tokyo Metropolitan University CREST, Japan Science and Technology Agency
  • KANAMURA Kiyoshi
    Department of Applied Chemistry, Graduate School of Engineering, Tokyo Metropolitan University CREST, Japan Science and Technology Agency

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  • Studies on Electrochemical Oxidation of Propylene Carbonate Electrolyte on LiMn2O4 Thin Film Electrode

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Abstract

<p>In situ FTIR measurements were performed to analyze the electrochemical oxidation of propylene carbonate with 1.0 mol dm-3 LiClO4 on LiMn2O4 cathode used in rechargeable lithium batteries. A thin film electrode of LiMn2O4 was prepared by rf-sputtering method. The prepared LiMn2O4 film had a high quality as an electrode for the in situ FTIR measurement. The subtractively normalized interfacial FTIR (SNIFTIR) spectra were obtained at various electrode potentials from 3.8 V to 4.8 V vs. Li/Li+. The peaks in the SNIFTIR spectra corresponding to decomposition products of propylene carbonate showed that the electrochemical oxidation of propylene carbonate started at 4.4 V. The oxidation products of propylene carbonate were assigned to compounds having carboxylic groups. Furthermore, from the comparison of in situ FTIR spectra for LiCoO2 and LiMn2O4 cathodes, it was shown that final products depend on the kind of transition metal oxides.</p>

Journal

  • Electrochemistry

    Electrochemistry 73 (1), 54-59, 2005-01-05

    The Electrochemical Society of Japan

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