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

Title
Functionalized Sulfide Solid Electrolyte with Air-Stable and Chemical-Resistant Oxysulfide Nanolayer for All-Solid-State Batteries
Authors
김병국김형철정훈기김지수신성수전민재정으뜸이종흔정용재
Keywords
solid electrolyte; sulfide; environmental mechanical alloying; core-shell structure; all-solid-state battery
Issue Date
2020-10
Publisher
ACS omega
Citation
VOL 5, NO 40-26022
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.
URI
http://pubs.kist.re.kr/handle/201004/71935
ISSN
2470-1343
Appears in Collections:
KIST Publication > Article
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