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Partial substitution of V by other transition metals in Na3V2(PO4)3 (NVP) can improve the electrochemical performance of NVP as a cathode for sodium–ion batteries (SIBs). Herein, phosphate Na–V–Mn–Ni–containing composites based on NASICON (Natrium Super Ionic Conductor)–type structure have been fabricated by sol–gel method. The synchrotron–based X–ray study, X–ray diffraction (XRD), and X–ray photoelectron...