Broad Redox Density of States and S-O Functionalities Drive Stable Pseudocapacitive Behavior in Sulfurized Polyacrylonitrile (SPAN) Cathodes.

ABSTRACT: Sulfurized polyacrylonitrile (SPAN) cathodes offer a promising route for improving Li-S batteries by eliminating polysulfide shuttling and enabling stable, high-rate performance. Here, a comprehensive mechanistic study of SPAN cathodes with varying sulfur content (0-35 wt.%), revealing how structural and electronic factors that govern charge storage is presented. Cyclic voltammetry shows that SPAN exhibits distinct redox features without soluble polysulfides, and that higher sulfur content leads to sharper redox peaks and increased capacity. In situ Raman spectroscopy reveals that electrochemical cycling induces the formation of nanocrystalline sp² carbon domains and a decline in φ-S_x species. X-ray photoelectron spectroscopy shows the presence of stable S- O function

SUBMITTER: Mohonta SK 

PROVIDER: S-EPMC12631823 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature