Synergetic impact of high-entropy microdoping modification in Na3V2(PO4)3

Abstract

High entropy polyanionic Na₃V_1.9(Ca,Mg,Cr,Ti,Mn)_0.1(PO₄)₃ was synthesized, which activated a reversible redox reaction of V⁴⁺/V⁵⁺ and reached a remarkable capacity of 116 mA h g⁻¹ at 1C and maintained 90% capacity retention after 1000 cycles at 10C. Structure evolution and sodium storage mechanisms were revealed by an in situ XRD method, which disclosed the high-entropy effect of material design. Together with the full battery tests, these findings promote the wide applications of high-entropy polyanionic cathodes in SIBs.