Interfacial Reactivity Benchmarking of the Sodium Ion Conductors Na3PS4and Sodium β-Alumina for Protected Sodium Metal Anodes and Sodium All-Solid-State Batteries.
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 Na3PS4as a solid electrolyte against metallic Na and compare it to that of Na-β″-Al2O3(sodium β-alumina). As expected, Na-β″-Al2O3is stable against sodium, whereas Na3PS4decomposes with an increasing overall resistance, making Na-β″-Al2O3the electrolyte of choice for protected sodium anodes and all-solid-state batteries.
Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
Sebastian
S
Wenzel
Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
Thomas
T
Leichtweiss
Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
Dominik A
DA
Weber
Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
Joachim
J
Sann
Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
Wolfgang G
WG
Zeier
Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 17, 35392 Gießen, Germany.
Jürgen
J
Janek
Na3PS4; alkali metal; interface stability; sodium-ion conductor; solid electrolyte interphase; solid-state batteries