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Liquid-phase synthesis of Li3PS4 solid electrolyte using ethylenediamine

  • Original Paper: Sol-gel and hybrid materials for energy, environment and building applications
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Abstract

Li3PS4 is the most typical solid electrolyte for all-solid-state lithium batteries. However, to date, there are few reports on Li3PS4 solid electrolyte synthesized using the solution process. Here, β-Li3PS4 solid electrolytes were prepared via liquid-phase synthesis by dissolving Li2S and P2S5 in ethylenediamine (EDA) to form a homogeneous solution of Li3PS4. Since EDA is a basic protonic solvent, it effectively suppressed the decomposition of Li3PS4. An intermediate phase consisting of Li3PS4 and EDA was formed as a precursor after drying the EDA solution at 200 °C under vacuum. After heat treatment at temperatures above 260 °C, β-Li3PS4 was crystallized from the precursor. The ionic conductivity of the prepared β-Li3PS4 was 5.0 × 10−5 S cm−1 at 25 °C and the activation energy for conduction was 35 kJ mol−1. The obtained EDA solution of Li3PS4 will be effective in forming electrolyte-electrode interfaces with the large contact areas in all-solid-state batteries.

Highlights

  • β-Li3PS4 is prepared via liquid-phase synthesis using a ethylenediamine solution.

  • Ethylenediamine effectively suppresses the decomposition of PS43−.

  • The ionic conductivity of the prepared β-Li3PS4 is 5.0 × 10−5 S cm−1 at 25 °C.

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Funding

This work was partially supported by JST ALCA-SPRING (Grant JPMJAL1301), Japan.

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Authors and Affiliations

  1. Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan

    Akane Ito, Takuya Kimura, Atsushi Sakuda, Masahiro Tatsumisago & Akitoshi Hayashi

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  1. Akane Ito
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  2. Takuya Kimura
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  3. Atsushi Sakuda
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  4. Masahiro Tatsumisago
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  5. Akitoshi Hayashi
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Correspondence to Atsushi Sakuda or Akitoshi Hayashi.

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Ito, A., Kimura, T., Sakuda, A. et al. Liquid-phase synthesis of Li3PS4 solid electrolyte using ethylenediamine. J Sol-Gel Sci Technol 101, 2–7 (2022). https://doi.org/10.1007/s10971-021-05524-y

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  • DOI: https://doi.org/10.1007/s10971-021-05524-y

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