Tang Shibao, Zhang Xiaoping, Sui Yulei, Wang Bingjue, Li Jiangpeng, Wu Ling
School of Iron and Steel, Soochow University, Suzhou, China.
Front Chem. 2021 Jan 13;8:633949. doi: 10.3389/fchem.2020.633949. eCollection 2020.
NaFe6MnPOF/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 NaFeMnPOF/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 NaFeMnPOF/C composite materials. Among these NaFeMnPOF/C materials, the sample prepared with ascorbic acid presents a uniform hollow spherical architecture. Electrochemical analysis demonstrates that the NaFeMnPOF/C sample prepared with ascorbic acid has optimal electrochemical performance. The sample shows high discharge capacities of 95.1 and 48.1 mAh g 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 NaFeMnPOF/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法，用各种碳源合成了NaFe6MnPOF/C复合材料，并详细研究了碳源对NaFeMnPOF/C材料的结构、形貌和电化学性能的影响。XRD和SEM结果表明，碳源的还原能力对NaFeMnPOF/C复合材料的结构和形貌有关键影响。在这些NaFeMnPOF/C材料中，用抗坏血酸制备的样品呈现出均匀的空心球形结构。电化学分析表明，用抗坏血酸制备的NaFeMnPOF/C样品具有最佳的电化学性能。该样品在0.05C和1C倍率下的放电容量分别为95.1和48.1 mAh g，并且表现出改善的循环稳定性（在0.5C下100次循环后保持率为91.7%），优于用其他碳源制备的NaFeMnPOF/C材料。本研究表明，碳源的还原能力显著影响氟磷酸盐/C复合材料的电化学性能。这项工作还为获得高性能钠离子电池正极材料提供了一种有前景的策略。
