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A new approach: Li2S-P2S5 thin-films prepared by thermal evaporation as solid electrolytes

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Abstract

Li2S-P2S5 thin-film solid electrolytes are synthesized by using room-temperature thermal evaporation for use as lithium-ion conductors for all-solid-state Li-ion batteries. The local structures of 75.51Li2S:24.49P2S5 and 77.64Li2S:22.36P2S5 prepared in this way have hetero units that facilitate lithium-ion mobility. The lithium-ion conductivity at room temperature for the 77.64Li2S:22.36P2S5 thin-film (4.0 × 10−6 S cm−1) is higher than that for the 75.51Li2S:24.49P2S5 thin-film (1.2 × 10−6 S cm−1). The increased ion conductivity in the 77.64Li2S:22.36P2S5 film is due to the additional local P2S7 4− structure that forms a glassy state during the thermal evaporation process. The local structure can lead to a high mobility of Li+ ions in the Li2S-P2S5 system due to the non-bridging sulfide ions. Lithium-ion-conducting thin-films prepared by using thermal evaporation, as reported in this study, are promising solid electrolytes.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Korea

    Sung Pil Woo

  2. Department of Chemical and Biological Engineering, Gachon University, Seongnam, 13120, Korea

    Nitul Kakati, In Yea Kim, Seok Hee Lee & Young Soo Yoon

Authors
  1. Sung Pil Woo
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  2. Nitul Kakati
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  3. In Yea Kim
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  4. Seok Hee Lee
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  5. Young Soo Yoon
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Correspondence to Seok Hee Lee or Young Soo Yoon.

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Woo, S.P., Kakati, N., Kim, I.Y. et al. A new approach: Li2S-P2S5 thin-films prepared by thermal evaporation as solid electrolytes. Journal of the Korean Physical Society 69, 617–622 (2016). https://doi.org/10.3938/jkps.69.617

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  • DOI: https://doi.org/10.3938/jkps.69.617

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