$\text{NaFe}{\left({\text{SO}}_4\right)}_2$ materials partially substituted with ${\text{SeO}}_4^{2-}$, ${\text{HPO}}_4^{2-}$ and ${\text{PO}}_3{\text{F}}^{2-}$ were prepared and investigated as possible cathode materials for sodium-ion batteries. Neutron diffraction and Raman spectroscopy studies confirmed the successful incorporation of ${\text{SeO}}_4^{2-}$ and ${\text{HPO}}_4^{2-}$, while the Raman studies suggested that significant hydrolysis of ${\text{PO}}_3{\text{F}}^{2-}$ had occurred during the synthesis. The effective diffusion coefficients were determined from conductivity and electrochemical kinetics studies, showing low Na ion diffusion. Galvanostatic and cyclic voltammetry investigations demonstrated more significant degradation and a narrowing of the electrochemical stability window for the doped materials, which was most significant for the ${\text{SeO}}_4$ and ${\text{HPO}}_4$ doped samples. Therefore, while doped $\text{NaFe}{\left({\text{SO}}_4\right)}_2$ were successfully prepared, the best electrochemical performance was shown for the undoped system.

$\text{钠铁}{（{\text{所以}}_4）}_2$ 被部分替代的材料 ${\text{硒}}_4^{2-}$， ${\text{高压氧}}_4^{2-}$ 和 ${\text{PO}}_3{\text{F}}^{2-}$制备并研究了钠离子电池的正极材料。中子衍射和拉曼光谱研究证实了成功引入${\text{硒}}_4^{2-}$ 和 ${\text{高压氧}}_4^{2-}$，而拉曼研究表明， ${\text{PO}}_3{\text{F}}^{2-}$在合成过程中发生过。有效的扩散系数由电导率和电化学动力学研究确定，显示出低的Na离子扩散。恒电流和循环伏安法研究表明，掺杂材料的降解更严重，电化学稳定性窗口变窄，这对掺杂材料最重要。${\text{硒}}_4$ 和 ${\text{高压氧}}_4$掺杂样品。因此，在掺杂时$\text{钠铁}{（{\text{所以}}_4）}_2$ 制备成功后，未掺杂系统显示出最佳的电化学性能。