Fabrication and High-temperature Electrochemical Stability of LiFePO<sub>4</sub> Cathode/Li<sub>3</sub>PO<sub>4</sub> Electrolyte Interface

DOI Web Site 研究データあり 参考文献49件
  • KANG Dongho
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • ITO Kotaro
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • SHIMIZU Keisuke
    Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
  • WATANABE Kenta
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
  • MATSUI Naoki
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
  • SUZUKI Kota
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
  • KANNO Ryoji
    Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
  • HIRAYAMA Masaaki
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology

抄録

<p>A thin-film battery composed of a LiFePO4 cathode/Li3PO4 electrolyte/Li anode was fabricated on a Pt/Ti/Si (PTS) substrate via RF magnetron sputtering. The amorphous Li3PO4 film was densely stacked on a 60 nm-thick LiFePO4 film, which provided a suitable reaction field for understanding the electrochemical properties of LiFePO4 at the interface with the solid electrolyte. The LiFePO4 cathode film exhibited highly reversible lithium desertion/insertion at the interface at room temperature and 60 °C, without any side reactions. An irreversible oxidation reaction occurred during the initial charging process at 100 °C, leading to an increase in the charge-transfer resistance of the LiFePO4/Li3PO4 interface with no significant decrease in the lithium desertion/insertion capacity of LiFePO4. This result suggests the formation of a resistive interphase via the decomposition of Li3PO4 at 100 °C. A severe decrease in capacity is observed at 125 °C, which indicates the LiFePO4-side interface contributed to the side reactions. The film battery exhibits a severe decrease in capacity at 125 °C.</p>

収録刊行物

  • Electrochemistry

    Electrochemistry 92 (3), 037008-037008, 2024-03-28

    公益社団法人　電気化学会

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