Amorphous sulfurized polyacrylonitrile suppresses polysulfide shuttling in Li–S batteries, enabling long cycle life, but the structural processes involved during synthesis and initial cycling remained unclear. An operando pair distribution function, wide-angle scattering and sulfur absorption spectroscopy reveal S–C bond formation, π–π stacking and sulfur-chain shortening, which enable reversible sulfur redox.
- Nan Wang
- Shen Wang
- Enyuan Hu