Na₂Fe_0.6Mn_0.4PO₄F/C composite materials are synthesized with various carbon sources via a simple spray-drying method in this study, and the effect of carbon sources on structure, morphology, and electrochemical properties of Na₂Fe_0.6Mn_0.4PO₄F/C materials are investigated in detail. XRD and SEM results indicate that the reduction ability of carbon sources has a key impact on the structure and morphology of Na₂Fe_0.6Mn_0.4PO₄F/C composite materials. Among these Na₂Fe_0.6Mn_0.4PO₄F/C materials, the sample prepared with ascorbic acid presents a uniform hollow spherical architecture. Electrochemical analysis demonstrates that the Na₂Fe_0.6Mn_0.4PO₄F/C sample prepared with ascorbic acid has optimal electrochemical performance. The sample shows high discharge capacities of 95.1 and 48.1 mAh g⁻¹ at 0.05C and 1C rates, respectively, and it exhibits an improved cycle stability (91.7% retention after 100 cycles at 0.5C), which are superior to Na₂Fe_0.6Mn_0.4PO₄F/C materials prepared with other carbon sources. This study demonstrates that the reduction ability of carbon sources significantly influences the electrochemical properties of fluorophosphate/C composite materials. This work also provides a promising strategy to obtain high performance cathode materials for sodium-ion batteries.

本研究通过简单的喷雾干燥方法，用多种碳源合成了Na ₂ Fe _0. 6Mn _0.4 PO ₄ F / C复合材料，以及碳源对Na ₂ Fe _0.6的结构，形貌和电化学性能的影响。详细研究了Mn _0.4 PO ₄ F / C材料。XRD和SEM结果表明，碳源的还原能力对Na ₂ Fe _0.6 Mn _0.4 PO ₄ F / C复合材料的结构和形貌具有关键影响。其中Na ₂ Fe _0.6 Mn用抗坏血酸制备的_0.4 PO ₄ F / C材料具有均匀的空心球形结构。电化学分析表明，用抗坏血酸制备的Na ₂ Fe _0.6 Mn _0.4 PO ₄ F / C样品具有最佳的电化学性能。该样品在0.05C和1C的速率下分别显示出95.1和48.1 mAh g ^-1的高放电容量，并且显示出改善的循环稳定性（在0.5C下100次循环后保留率为91.7％），优于Na ₂ Fe _0.6锰_0.4 PO ₄用其他碳源制备的氟碳材料。这项研究表明，碳源的还原能力显着影响氟磷酸盐/碳复合材料的电化学性能。这项工作也为获得用于钠离子电池的高性能阴极材料提供了一种有前途的策略。