The crucial role of oxygen substitution in argyrodite solid electrolytes from the bulk to the surface under atmospheric conditions

Abstract

Argyrodite-type sulfide-based solid electrolytes (SEs) have received immense interest because of their high ionic conductivity. In contrast, poor structural and electrochemical stabilities of argyrodite-type SEs have recently emerged as a...

Fundamentals of the Cathode‐Electrolyte Interface in All‐solid‐state Lithium Batteries

“…directly sulfurize the LNMO itself to obtain a new series of sulfurized LNMO (LNMO‐S), which remarkably reduced the interfacial reactivity between the cathode and SE during charging and enabled the stable operation with a cut‐off voltage of 5 V (Figure 8f). [173] The consequent LNMO‐S/sulfide SE‐based ASSB showed three times higher initial discharge capacity and significantly reduced polarization than LNMO counterparts.…”

A perspective on the building blocks of a solid-state battery: from solid electrolytes to quantum power harvesting and storage

“…This approach combines the best attributes of sulfur and oxygen, leading to meaningful results. 89 Hwang et al 89 investigated the substitution of oxygen (O) by sulfur (S) in Li 6 PO x S 5−x Br 0.5 Cl 0.5 SEs to comprehend the underlying mechanisms and improve the stability of these materials. In his study, the author combined rst-principles calculations and electrochemical experiments, spanning from bulk to surface models.…”

Conductive carbon embedded beneath cathode active material for longevity of solid-state batteries

“…Whereas cation substitutions barely affect their intrinsic oxidative electrochemical stability when sulfur remains a major part of the chemical composition, 22 partial substitution of oxygen with sulfur has been suggested to increase the oxidation limit. 23,24 Coating of halide SEs with higher oxidative stability on the CAM also results in improved cycling stability as the formation of a detrimental interface between the CAM and argyrodite SE can be avoided, and the halide SE functions as a Li-conducting buffer layer in this composite cathode design. 25 The use of an electronically conductive carbon additive in the composite cathode is necessary to provide facile electron transfers to the CAMs and create uniform current distributions.…”