Glass Electrolytes with High Ion Conductivity and High Chemical Stability in the System LiI-Li<sub>2</sub>O-Li<sub>2</sub>S-P<sub>2</sub>S<sub>5</sub>

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  • OHTOMO Takamasa
    Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University Battery Research Division, Toyota Motor Corporation, Higashifuji Technical Center
  • HAYASHI Akitoshi
    Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
  • TATSUMISAGO Masahiro
    Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
  • KAWAMOTO Koji
    Battery Research Division, Toyota Motor Corporation, Higashifuji Technical Center

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  • Glass Electrolytes with High Ion Conductivity and High Chemical Stability in the System LiI-Li₂O-Li₂S-P₂S₅

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The Li2O-Li2S-P2S5 glasses, which were prepared by a reaction of the Li2S-P2S5 glass and Li2O, hardly generated H2S gas in air. These glasses showed relatively high ion conductivities about 10−4 S cm−1 at room temperature. However, these conductivities were lower than those of original sulfide glasses. In this study, an addition of LiI to the Li2O-Li2S-P2S5 glasses was examined in order to improve ion conductivities. The 30LiI·70(0.07Li2O·0.68Li2S·0.25P2S5) glass showed high ion conductivity of 1.3 × 10−3 S cm−1 at room temperature, and hardly generated H2S gas in air. On the other hand, the 30LiI·70(0.07Li2O·0.68Li2S·0.25P2S5) glass was electrochemically stable in the potential range of 0–10 V. Moreover, the all-solid-state C/LiCoO2 cell using the 30LiI·70(0.07Li2O·0.68Li2S·0.25P2S5) glass as solid electrolytes worked as lithium secondary batteries at room temperature, and exhibited a good cycle performance. Therefore, the 30LiI·70(0.07Li2O·0.68Li2S·0.25P2S5) glass was a suitable electrolyte for all-solid-state cells because the glass had high conductivity, wide electrochemical window and high chemical stability to moisture.

Journal

  • Electrochemistry

    Electrochemistry 81 (6), 428-431, 2013

    The Electrochemical Society of Japan

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