Abstract
Na3V2(PO4)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 Na3V2−x(Mg0.5Mn0.5)x(PO4)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 Na3V2(PO4)3 effectively. Our work provides a novel idea to construct high performance SIBs via a bimetallic co-doped strategy.
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