Ionics ( IF 2.4 ) Pub Date : 2023-09-12 , DOI: 10.1007/s11581-023-05208-3
Shaocong Wang , Wei Li , Dan Sun , Yifei Guo , Zheng Liu , Guo-Cheng Han
The effects of the two materials, Ti3C2-CQDs and Na3V2(PO4)2F3, on the electrochemical properties of Na2MnPO4F were systematically investigated by double modification of Na2MnPO4F by spray drying method combined with high-temperature calcination. Firstly, different ratios of xNa2MnPO4F-(1-x)Na3V2(PO4)2F3 materials were synthesized and discussed to obtain 0.6Na2MnPO4F-0.4Na3V2(PO4)2F3 material as optimal ratio. Ti3C2-CQDs were added on this basis, and electrochemical tests were performed at the same time. The initial discharge-specific capacity of 0.6Na2MnPO4F-0.4Na3V2(PO4)2F3/Ti3C2-CQDs was 137.4 mAh-g−1, indicating that Ti3C2-CQDs can improve the electronic conductivity as well as the ion diffusion rate of the material and the capacity retention rate. Na3V2(PO4)2F3 can effectively inhibit the Jahn–Teller effect, enhance the stability of the material structure, and improve the electrochemical activity of the material. The synergistic modification leads to a double enhancement of the electrochemical performance of Na2MnPO4F. It hopes that the findings can provide ideas for improving the electrochemical properties of polyionic compounds.
中文翻译:
Na3V2(PO4)2F3和Ti3C2-CQDs双重修饰改善Na2MnPO4F的电化学性能
通过喷雾对Na 2 MnPO 4 F进行双重改性,系统研究了Ti 3 C 2 -CQDs和Na 3 V 2 (PO 4 ) 2 F 3两种材料对Na 2 MnPO 4 F电化学性能的影响。干燥与高温煅烧相结合的方法。首先合成并讨论了不同配比的xNa 2 MnPO 4 F-(1-x)Na 3 V 2 (PO 4 ) 2 F 3材料以获得0.6Na 2以MnPO 4 F-0.4Na 3 V 2 (PO 4 ) 2 F 3材料为最佳配比。在此基础上添加Ti 3 C 2 -CQDs,同时进行电化学测试。0.6Na 2 MnPO 4 F-0.4Na 3 V 2 (PO 4 ) 2 F 3 /Ti 3 C 2 -CQDs的首次放电比容量为137.4 mAh-g -1,表明Ti 3 C 2-CQDs可以提高材料的电子电导率以及离子扩散速率和容量保持率。Na 3 V 2 (PO 4 ) 2 F 3能够有效抑制Jahn-Teller效应,增强材料结构的稳定性,提高材料的电化学活性。协同改性使得Na 2 MnPO 4 F的电化学性能得到双重增强。希望该研究结果能够为改善聚离子化合物的电化学性能提供思路。