Functionalized Sulfide Solid Electrolyte with Air-Stable and Chemical-Resistant Oxysulfide Nanolayer for All-Solid-State Batteries

Wo Dum Jung, Minjae Jeon, Sung Soo Shin, Ji Su Kim, Hun Gi Jung, Byung Kook Kim, Jong Heun Lee, Yong Chae Chung, Hyoungchul Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Sulfide solid electrolytes (SEs) with high Li-ion conductivities (σion) and soft mechanical properties have limited applications in wet casting processes for commercial all-solid-state batteries (ASSBs) because of their inherent atmospheric and chemical instabilities. In this study, we fabricated sulfide SEs with a novel core-shell structure via environmental mechanical alloying, while providing sufficient control of the partial pressure of oxygen. This powder possesses notable atmospheric stability and chemical resistance because it is covered with a stable oxysulfide nanolayer that prevents deterioration of the bulk region. The core-shell SEs showed a σion of more than 2.50 mS cm-1 after air exposure (for 30 min) and reaction with slurry chemicals (mixing and drying for 31 min), which was approximately 82.8% of the initial σion. The ASSB cell fabricated through wet casting provided an initial discharge capacity of 125.6 mAh g-1. The core-shell SEs thus exhibited improved powder stability and reliability in the presence of chemicals used in various wet casting processes for commercial ASSBs.

Original languageEnglish
Pages (from-to)26015-26022
Number of pages8
JournalACS Omega
Volume5
Issue number40
DOIs
Publication statusPublished - 2020 Oct 13

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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