Chemical Imaging of Cathode–Electrolyte Interphase in Sulfide Solid-State Batteries
Abstract
The cathode–electrolyte interphase critically impacts the performance of solid-state batteries, yet its chemical evolution remains poorly understood, especially in sulfide systems. Here, we employ scanning transmission X-ray microscopy (STXM) to directly map the NMC–argyrodite interphase. We show that sulfide oxidation primarily occurs at the electrolyte surrounding the NMC particles, while the bulk electrolyte remains electrochemically stable. This interfacial oxidation, accompanied by Ni reduction, leads to the formation of P 2 S x, S 0, and SO x 2– species at interphase. Our results provide direct evidence of cathode–electrolyte interactions and elucidate interfacial degradation.
Fields of Study & Subjects
Advanced Battery Materials and Technologies
Advancements in Battery Materials
Advanced battery technologies research
Publication details
- Journal / source
- ACS Energy Letters
- Publisher
- American Chemical Society (ACS)
- Volume
- 11
- Issue
- 3
- Pages
- 2668–2676
- Publication date
- 13 February 2026
- Language
- EN