Dual-Defect Engineering Strategy Enables High-Durability Rechargeable Magnesium-Metal Batteries

MVOH/rGO cathode with dual defect of Mg 2+ pre-intercalation defect (P-Mg d ) and surface oxygen defect (O d ) is prepared. The dual defect of O d and P-Mg d in MVOH/rGO lamellar structure effectively enhances Mg 2+ migration kinetics, structural stability, and electronic conductivity. The Mg foil//MVOH/rGO full cell achieves an ultralong lifespan of 850 cycles at 0.1 A g −1 and powers an orange light-emitting diode.