High-performance Na 3.5 Fe 0.5 V 1.5 (PO 4 ) 3 cathodes enabled by phase control and CQD-containing carbon coating

A CQD-integrated hybrid carbon coating enables the fabrication of phase-pure Na 3.5 Fe 0.5 V 1.5 (PO 4 ) 3 cathodes with fast kinetics, excellent rate capability, and ultralong cycle life, offering a scalable route for high-performance sodium-ion batteries.