Carbon quantum dot modified Na3V2(PO4)2F3as a high-performance cathode material for sodium-ion batteries

We fabricate carbon quantum dot-modified Na₃V₂(PO₄)₂F₃hierarchical microspheres, which exhibit outstanding high-rate and ultralong-life performance as a half-cell cathode. A Na-ion full-cell (with a hard carbon anode) delivers high cell voltage and good cycling stability.