nz0c00251_si_002.mp4 (2.37 MB)
Thin and Flexible Solid Electrolyte Membranes with Ultrahigh Thermal Stability Derived from Solution-Processable Li Argyrodites for All-Solid-State Li-Ion Batteries
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posted on 2020-02-11, 20:35 authored by Dong Hyeon Kim, Yong-Hyeok Lee, Yong Bae Song, Hiram Kwak, Sang-Young Lee, Yoon Seok JungSheet-type
solid electrolyte (SE) membranes are essential for practical
all-solid-state Li batteries (ASLBs). To date, SE membrane development
has mostly been based on polymer electrolytes with or without the
aid of liquid electrolytes, which offset thermal stability (or safety).
In this study, a new scalable fabrication protocol for thin (40–70
μm) and flexible single-ion conducting sulfide SE membranes
with high conductance (29 mS) and excellent thermal stability (up
to ∼400 °C) is reported. Electrospun polyimide (PI) nonwovens
provide a favorable porous structure and ultrahigh thermal stability,
thus accommodating highly conductive infiltrating solution-processable
Li6PS5Cl0.5Br0.5 (2.0
mS cm–1). LiNi0.6Co0.2Mn0.2O2/graphite ASLBs using 40 μm thick Li6PS5Cl0.5Br0.5-infiltrated
PI membranes show promising performances at 30 °C (146 mA h g–1) and excellent thermal stability (marginal degradation
at 180 °C). Moreover, a new proof-of-concept fabrication protocol
for ASLBs at scale that involves the injection of liquefied SEs into
the electrode/PI/electrode assemblies is successfully demonstrated
for LiCoO2/PI–Li6PS5Cl0.5Br0.5/Li4Ti5O12 ASLBs.
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stabilityPI membranes showStability DerivedAll-Solid-State Li-Ion Batteries Sheet-type40 μ mscalable fabrication protocolASLBproof-of-concept fabrication protocolElectrolyte MembranesElectrospun polyimidepolymer electrolytesSolution-Processable Li Argyroditesall-solid-state Li batteriessulfide SE membranesLi 6 PS 5 Cl 0.5 Br 0.5SE membrane development
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