Electrochemical and mechanical properties and chemical stability of Li10GeP2S12/Al2O3 composite electrolytes

Takumi Yabuzaki; Miho Sato; Hanseul Kim; Kenta Watanabe; Naoki Matsui; Kota Suzuki; Satoshi Hori; Kazuhiro Hikima; Satoshi Obokata; Hiroyuki Muto; Atsunori Matsuda; Ryoji Kanno; Masaaki Hirayama

doi:10.2109/jcersj2.23070

Feature: Frontiers in Ceramic Research Based on Materials Science of Crystal Defect Cores: Full papers

Electrochemical and mechanical properties and chemical stability of Li₁₀GeP₂S₁₂/Al₂O₃ composite electrolytes

Takumi Yabuzaki, Miho Sato, Hanseul Kim, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Satoshi Hori, Kazuhiro Hikima, Satoshi Obokata, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama

Author information

Takumi Yabuzaki
Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
Miho Sato
Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
Hanseul Kim
Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
Kenta Watanabe
Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
Naoki Matsui
Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology
Kota Suzuki
Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology
Satoshi Hori
Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology
Kazuhiro Hikima
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
Satoshi Obokata
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
Hiroyuki Muto
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
Institute of Liberal Arts and Sciences, Toyohashi University of Technology
Atsunori Matsuda
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
Ryoji Kanno
Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology
Masaaki Hirayama
Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology

Keywords: Solid electrolyte, Lithium ion conductor, Sulfide, Li–Ge–P–S, Aluminum oxide, All solid-state battery

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Supplementary material

2023 Volume 131 Issue 10 Pages 675-684

DOI https://doi.org/10.2109/jcersj2.23070

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Abstract

Sulfide-type solid electrolytes for all-solid-state lithium-ion batteries are required to have high ionic conductivity, high (electro) chemical stability, and suitable mechanical properties. Compositing different materials is widely performed in developing multifunctional materials. However, only a few studies have investigated sulfide electrolytes due to the concern of lowering ionic conductivity. In this study, composite electrolytes comprising Li₁₀GeP₂S₁₂ (LGPS)-type electrolytes and nanosized Al₂O₃ are fabricated by a solid-state reaction. Al₂O₃ particles are mainly located in the voids between LGPS particles, whereas very limited oxygen content is substituted for sulfur in the LGPS structure. LGPS–Al₂O₃ composites exhibit ionic conductivities of ∼5 mS cm⁻¹ without significant changes by compositing Al₂O₃. LGPS–Al₂O₃ composites are softer and have higher atmospheric stability than uncomposed LGPS. All solid-state cells that use air-exposed LGPS–Al₂O₃ as a separator layer exhibit an improved cycle retention compared with that using air-exposed LGPS. These results demonstrate that electrolyte compositing is an effective means of improving other properties while maintaining high lithium ionic conductivity.

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