Mechanical Properties of Li<sub>10.35</sub>Ge<sub>1.35</sub>P<sub>1.65</sub>S<sub>12</sub> with Different Particle Sizes

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  • KIM Hanseul
    Dept. Chemical Science and Engineering, Tokyo Inst. Tech.
  • HIKIMA Kazuhiro
    Dept. Electrical and Electronic Information Engineering, Toyohashi Univ. Tech.
  • WATANABE Kenta
    Dept. Chemical Science and Engineering, Tokyo Inst. Tech.
  • MATSUI Naoki
    Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology
  • SUZUKI Kota
    Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology
  • OBOKATA Satoshi
    Dept. Electrical and Electronic Information Engineering, Toyohashi Univ. Tech.
  • MUTO Hiroyuki
    Dept. Electrical and Electronic Information Engineering, Toyohashi Univ. Tech. Institute of Liberal Arts and Sciences, Toyohashi University of Technology
  • MATSUDA Atsunori
    Dept. Electrical and Electronic Information Engineering, Toyohashi Univ. Tech.
  • KANNO Ryoji
    Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology
  • HIRAYAMA Masaaki
    Dept. Chemical Science and Engineering, Tokyo Inst. Tech. Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology

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Other Title
  • 硫化物固体電解質Li<sub>10.35</sub>Ge<sub>1.35</sub>P<sub>1.65</sub>S<sub>12</sub>の微細化による機械的強度の向上
  • 硫化物固体電解質Li[10.35]Ge[1.35]P[1.65]S₁₂の微細化による機械的強度の向上
  • リュウカブツ コタイ デンカイシツ Li[10.35]Ge[1.35]P[1.65]S ₁ ₂ ノ ビサイカ ニ ヨル キカイテキ キョウド ノ コウジョウ

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Abstract

<p>Mechanical properties of Li10.35Ge1.35P1.65S12(LGPS) solid electrolytes with different grain sizes were investigated via indentation tests. Hand-milled LGPS (HM LGPS, d50:1.32 µm) and wet-milled LGPS (WM LGPS, d50:0.46 µm) powders were uniaxially pressed to obtain pellet samples. The HM LGPS and WM LGPS pellets had a similar bulk density of 1.63 g cm–3. At the initial loading/unloading, the WM LPGS pellet showed a large deformation owing to a decrease in cavities compared with the HM LGPS. In the subsequent cycles, both pellets exhibited elastic deformation behavior in the pressure range up to 20 N. The elastic modulus and relative residual depth of HM LGPS and WM LGPS were 21.7 GPa and 0.41 GPa and 0.75 and 0.71, respectively. This result revealed that WM LGPS is more elastically deformable and less plastically deformable than HM LGPS, which could be associated with the grain boundary strengthening interpreted by the Hall-Petch relation. Based on these mechanical properties, the superior cycle stability at the In-Li electrode/WM LGPS electrolyte interface during charging/discharging was discussed. Controlling the mechanical properties of sulfide solid electrolytes by the grain size is important for suppressing physical degradation in all-solid-state batteries.</p>

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