Sulfide
solid electrolytes (SEs) with high Li-ion conductivities
(σ
ion
) 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 σ
ion
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 σ
ion
. 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.
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