Electrochemical properties of NaFe 2 PO 4 (SO 4 ) 2 via Cr 3+ doping as cathode material for sodium-ion batteries
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Sodium, as an abundant resource, has garnered significant attention in sodium-ion battery research. This study investigates Cr 3+ -doped NaFe 2 PO 4 (SO 4 ) 2 as a cathode material for sodium batteries. Six groups of NaCr x Fe 2-x PO 4 (SO 4 ) 2 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) were prepared by high temperature sintering and solid state method. Characterization through X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and electrochemical tests revealed that Cr 3+ doping improves the conductivity of the cathode material, enhancing structural resilience. Cr elements showed no segregation in the lattice. At a current density of 25 mA·g -1 , the material retains considerable capacity after 80 cycles. Comparative analysis demonstrated that the sample with Cr 3+ doping concentration of 0.08 maintains high specific capacity while exhibiting superior cycling stability and coulombic efficiency.
