Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 41, Pages 28216-28224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10119
Keywords
solid-state batteries; sodium-ion conductor; alkali metal; interface stability; Na3PS4; solid electrolyte interphase
Funding
- BASF Scientific Network for Electrochemistry and Batteries
- LOEWE program of excellence of the Federal State of Hessen (Project Initiative STORE-E)
- Laboratory of Materials Research (LaMa) of JLU
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The interfacial stability of solid electrolytes at the electrodes is crucial for an application of all-solid-state batteries and protected electrodes. For instance, undesired reactions between sodium metal electrodes and the solid electrolyte form charge transfer hindering interphases. Due to the resulting large interfacial resistance, the charge transfer kinetics are altered and the overvoltage increases; making the interfacial stability of electrolytes the limiting factor in these systems. Driven by the promising ionic conductivities of Na3PS4, here we explore the stability and viability of Na3PS4 as a solid electrolyte against metallic Na and compare it to that of Na-beta ''-Al2O3 (sodium beta-alumina). As expected, Na-beta ''-Al2O3 is stable against sodium, whereas Na3PS4 decomposes with an increasing overall resistance, making Na-beta ''-Al2O3 the electrolyte of choice for protected sodium anodes and all-solid-state batteries.
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