Reversible dual anionic-redox chemistry in NaCrSSe with fast charging capability

Utilizing the anionic redox reaction opens new approaches for development of cathode materials with extra capacities. Although, it suffers from several obstacles such as voltage hysteresis and sluggish kinetics. In this paper, a layered chalcogenide-based on dual anionic-redox is reported. The newly designed NaCrSSe exhibits capacity almost all Na + intercalation/deintercalation (137 mAh g−1 at 50 mA g−1), unique charge/discharge feature small polarization 0.15 V high energy efficiencies ~92% in initial cycles. Furthermore, superior high-rate charge 115.5mAh (83.7% retention) was achieved 27.8 C (4000 g−1). Systematic characterization studies structure evolution DFT calculation show compensation S Se anions during cycling. These results will enrich anion chemistry provide valuable information developing anion-redox based fast