Oxygen-Substitution Effects on the Properties of Argyrodite-Type Sulfide Solid Electrolytes (Li<sub>5.5</sub>PS<sub>4.5−</sub><i><sub>x</sub></i>Br<sub>1.5</sub>O<i><sub>x</sub></i>, 0 ≦ <i>x</i> ≦ 0.5)

DOI Web Site Research Data 25 References
  • TSUKAZAKI Rei
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo Enpower Japan Corp.
  • MATSUI Naoki
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo Research Center for All-Solid-State Battery, Institute of Integrated Research, Institute of Science Tokyo
  • HORI Satoshi
    Research Center for All-Solid-State Battery, Institute of Integrated Research, Institute of Science Tokyo
  • SUZUKI Kota
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo Research Center for All-Solid-State Battery, Institute of Integrated Research, Institute of Science Tokyo
  • KANNO Ryoji
    Research Center for All-Solid-State Battery, Institute of Integrated Research, Institute of Science Tokyo

Description

<p>Li-deficient argyrodite-type Li conductors are promising solid electrolytes for all-solid-state batteries because of their high ionic conductivity, favorable mechanical properties, and low synthesis cost. However, challenges such as incompatibility at the electrode/electrolyte interface must be addressed. In this study, Li-deficient argyrodite-type Li5.5PS4.5−xBr1.5Ox (0 ≦ x ≦ 0.5) was synthesized by oxygen substitution and its crystal structure and electrochemical properties were investigated. Oxygen is soluble at specific crystallographic sites (16e), with substitution increasing systematically as the value of x in Li5.5PS4.5−xBr1.5Ox increases. Furthermore, it was found that Li5.5PS4.5−xBr1.5Ox (x = 0.1) showed relatively high ionic conductivity and improved compatibility with the positive electrode. The cells incorporating Li5.5PS4.5−xBr1.5Ox (x = 0.1) in the cathode composite demonstrate excellent cycle stability, retaining 71.5 % of their capacity after 100 cycles at a 0.1C-rate. These findings clarify the effects and mechanisms of oxygen substitution in argyrodite-type Li5.5PS4.5Br1.5 and provide a strategy for advancing the practical application of all-solid-state batteries.</p>

Journal

  • Electrochemistry

    Electrochemistry advpub (0), 2025

    The Electrochemical Society of Japan

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