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Super Long-Cycling All-Solid-State Battery with Thin Li_6PS_5Cl-Based Electrolyte

机译:Super Long-Cycling All-Solid-State Battery with Thin Li_6PS_5Cl-Based Electrolyte

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摘要

All-solid-state batteries (ASSBs) using sulfide electrolytes have attracted everincreasinginterest due to high ionic conductivity of the sulfides. Nevertheless,a thin, strong solid-state sulfide electrolyte membrane maintaining highionic conductivity is highly desired for ASSBs. Here, a thin, flexible compositesolid electrolyte membrane composed of argyrodite sulfide Li6PS5Cl and apolar poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) framework isprepared via an electrospinning-infiltration-hot-pressing method. The interactionbetween Li_6PS_5Cl and polar P(VDF-TrFE) ensures a high lithium-ion conductivity(≈1.2 mS cm–1) at room temperature and good mechanical ductilityof the composite electrolyte membrane. The coin-type ASSB cells with thethin composite electrolyte membrane, a composite cathode of LiNbO3-coatedLiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 and Li6PS5Cl, and a lithium-indium anode, show supercycling performance, and the capacity retention is 92% after 1000 cycles and71% even after 20 000 cycles at 1.0 mA cm~(–2) (i.e., 1.61 C) at room temperature.Moreover, pouch-type ASSB cells with a high mass loading of active materialsare made to demonstrate the potential and feasibility in future commercialapplications.

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