A Comparative Study on Na(2)Fe(0.6)Mn(0.4)PO(4)F/C Cathode Materials Synthesized With Various Carbon Sources for Na-ion Batteries.
A Comparative Study on Na(2)Fe(0.6)Mn(0.4)PO(4)F/C Cathode Materials Synthesized With Various Carbon Sources for Na-ion Batteries.
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不同碳源合成的钠离子电池正极材料Na2Fe0.6Mn0.4PO4F/C的对比研究
DOI：
10.3389/fchem.2020.633949
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发表时间：
2020
影响因子：
5.5
通讯作者：
Wu L
中科院分区：
文献类型：
--
作者：
Tang S;Zhang X;Sui Y;Wang B;Li J;Wu L
本文采用喷雾干燥法制备了不同碳源的Na2Fe0.6Mn0.4PO4F/C复合材料，详细研究了碳源对Na2Fe0.6Mn0.4PO4F/C材料的结构、形貌和电化学性能的影响。X射线衍射和扫描电子显微镜结果表明，碳源的还原能力对Na2Fe0.6Mn0.4PO4F/C复合材料的结构和形貌有重要影响。在这些Na2Fe0.6Mn0.4PO4F/C材料中，用抗坏血酸制备的样品呈均匀的中空球形结构。电化学分析表明，用抗坏血酸制备的Na2Fe0.6Mn0.4PO4F/C样品具有最佳的电化学性能。样品在0.05C和1C倍率下的放电容量分别为95.1mAHg−1和48.1mAhg PO4F/C，循环稳定性提高(0.5C循环100次后保持率为91.7%)，优于其他碳源制备的Na2Fe0.6Mn0.4PO4F/C材料。研究表明，碳源的还原能力对氟磷酸盐/碳复合材料的电化学性能有显著影响。这项工作也为获得高性能的钠离子电池正极材料提供了一种很有前途的策略。
Na2Fe0.6Mn0.4PO4F/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 Na2Fe0.6Mn0.4PO4F/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 Na2Fe0.6Mn0.4PO4F/C composite materials. Among these Na2Fe0.6Mn0.4PO4F/C materials, the sample prepared with ascorbic acid presents a uniform hollow spherical architecture. Electrochemical analysis demonstrates that the Na2Fe0.6Mn0.4PO4F/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 Na2Fe0.6Mn0.4PO4F/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.
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