https://doi.org/10.1002/adfm.202505185Abstract:Na4Fe3(PO4)2(P2O7) (NFPP) is a promising cathode material for sodium-ion batteries (SIBs) due to its low cost, facile synthesis, environmental compatibility, high structural stability, and suitable operating voltage. However, its practical application is hindered by poor cycling stability, limited rate capability, and low electronic/ionic conducti...