CoPSe: A New Ternary Anode Material for Stable and High?Rate Sodium/Potassium?Ion Batteries

The exploration of ideal electrode materials overcoming the critical problems large volume changes and sluggish redox kinetics induced by ionic radius Na+/K+ ions is highly desirable for sodium/potassium-ion batteries (SIBs/PIBs) toward large-scale applications. present work demonstrates that single-phase ternary cobalt phosphoselenide (CoPSe) in form nanoparticles embedded a layered metal–organic framework (MOF)-derived N-doped carbon matrix (CoPSe/NC) represents an ultrastable high-rate anode material SIBs/PIBs. CoPSe/NC fabricated using MOF as both template precursor, coupled with situ synchronous phosphorization/selenization reactions. CoPSe holds set intrinsic merits such lower mechanical stress, enhanced reaction kinetics, well higher theoretical capacity discharge voltage relative to its counterpart CoSe2, suppressed shuttle effect electrical conductivity CoPS. involved mechanisms are evidenced substantial characterizations density functional theory (DFT) calculations. Consequently, shows outstanding long-cycle stability rate performance SIBs PIBs. Moreover, CoPSe/NC-based Na-ion full cell can achieve energy 274 Wh kg?1, surpassing based on CoSe2/NC most state-of-the-art cells P-, Se-, or S-containing binary/ternary anodes date.