Atomic-scale regulation of anionic and cationic migration in alkali metal batteries

Abstract The regulation of anions and cations at the atomic scale is great significance in membrane-based separation technologies. Ionic transport techniques could also play a crucial role developing high-performance alkali metal batteries such as metal-sulfur metal-selenium batteries, which suffer from non-uniform ions (e.g., Li + or Na ) detrimental shuttling effect polysulfide/polyselenide anions. These drawbacks cause unfavourable growth depositions electrode irreversible consumption cathode active materials, leading to capacity decay short cycling life. Herein, we propose use polypropylene separator coated with negatively charged Ti 0.87 O 2 nanosheets vacancies tackle these issues. In particular, demonstrate that electrostatic interactions between reduce effect. Moreover, -coated regulates migration ensuring homogeneous ion flux vacancies, acting sub-nanometric pores, promote fast alkali-ion diffusion.