Electrochemical and Mechanical Evolution of Sulfide-Based Solid Electrolytes: Insights from Operando XPS and Cell Pressure Measurements.

ABSTRACT: Understanding the electrochemical and mechanical behavior of solid electrolytes beyond their electrochemical stability window is crucial for enabling high energy density all-solid-state batteries. Accordingly, this work systematically studies a model working electrode of Li₃PS₄, ball milled with vapor grown carbon fiber (VGCF). Operando X-ray photoelectron spectroscopy can identify and quantify the potential-dependent redox byproducts, their reversibility, and electrical properties, while operando cell pressure measurements correlate these with volume changes and mechanical instability. The study examines voltages up to 5.0 V and down to -0.05 V versus Li/Li⁺, mimicking cathode and anode cycling. It demonstrates that within the 2.4-5.0 V region, Li₃

SUBMITTER: Siller V 

PROVIDER: S-EPMC12632433 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature