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Stabilizing the Interface between Sodium Metal Anode and Sulfide-Based Solid-State Electrolyte with an
Pu Hu1, Ye Zhang1, Xiaowei Chi1
1Department of Electrical and Computer Engineering and Materials Science and Engineering Program , University of Houston , Houston , Texas 77204 , United States.
Abstract:
Sulfide-based Na-ion conductors are promising electrolytes for all-solid-state sodium batteries (ASSSBs) because of high ionic conductivity and favorable formability. However, no effective strategy has been reported for long-duration Na cycling with sulfide-based electrolytes because of interfacial challenges. Here we demonstrate that a cellulose-poly(ethylene oxide) (CPEO) interlayer can stabilize the interface between sulfide electrolyte (Na3SbS4) and Na by shutting off the electron pathway of the electrolyte decomposition reaction. As a result, we achieved stable Na plating/stripping for 800 cycles at 0.1 mA cm-2 in all-solid-state devices at 60 °C.
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