Mg2+and Mn2+ bimetallic co-doped Na3V2(PO4)3 as advanced cathode for sodium-ion batteries.

• Mg2+ and Mn2+ co-doped Na 3 V 2 (PO 4) 3 is prepared via a simple high temperature solid method. • Mg2+ and Mn2+ co-doping can propel kinetics behavior and enhance electronic conductivity. • The NVP-(MM) 0.01 exhibits an outstanding rate and cycling performance. • Ex-situ XRD revealed that the structure of NVP-(MM) 0.01 is well maintained after 500 cycles at 10 C. In this article, Mg2+ and Mn2+ co-doped Na 3 V 2 (PO 4) 3 cathode material is prepared, which exhibits enhanced rate capability and long-term cyclic stability for sodium-ion batteries. [Display omitted] Na 3 V 2 (PO 4) 3 with open 3D framework structure is perceived as the most potential cathode material for sodium-ion batteries (SIBs). Nevertheless, its electrochemical properties are generally restricted by the larger radius of Na+ and the intrinsic poor electrical conductivity. Herein, we adopt a unique bimetallic doping strategy to prepare Mg2+ and Mn2+ co-doped Na 3 V 2−x (Mg 0.5 Mn 0.5) x (PO 4) 3 [NVP-(MM) x (x = 0, 0.01, 0.02)] through a high temperature solid state reaction. The as-prepared NVP-(MM) 0.01 presents a high initial discharge capacity of 107.7 mA h g−1 at 1 C. Furthermore, NVP-(MM) 0.01 displays a highly rate capability (75.5 mA h g−1 at 15 C) and excellent cycling performance (71 mA h g−1 after 1000 cycles at 20 C). Electrochemical results exhibit that Mg2+ and Mn2+ co-doped with appropriate proportion can enhance the electronic conductivity and sodium storage kinetics process of Na 3 V 2 (PO 4) 3 effectively. Our work provides a novel idea to construct high performance SIBs via a bimetallic co-doped strategy. [ABSTRACT FROM AUTHOR]