Improvement of the electrochemical properties of Na2MnPO4F by dual modification of Na3V2(PO4)2F3 and Ti3C2-CQDs

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL Ionics 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

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Abstract

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.

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Na3V2（PO4）2F3和Ti3C2CQDs的双重改性对Na2MnPO4F电化学性能的改善

采用喷雾干燥法和高温煅烧相结合的方法对Na2MnPO4F进行双重改性，系统研究了Ti3C2CQDs和Na3V2（PO4）2F3两种材料对其电化学性能的影响。首先，合成了不同配比的xNa2MnPO4F-（1-x）Na3V2（PO4）2F3材料，并对其进行了讨论，得到了最佳配比为0.6Na2MnPO4F-0.4Na3V2。在此基础上添加Ti3C2CQDs，同时进行电化学测试。0.6Na2MnPO4F-0.4Na3V2（PO4）2F3/Ti3C2CQDs的初始放电比容量为137.4mAh-g−1，表明Ti3C2CWDs可以提高材料的电子电导率、离子扩散率和容量保持率。Na3V2（PO4）2F3可以有效抑制Jahn–Teller效应，增强材料结构的稳定性，提高材料的电化学活性。协同改性导致Na2MnPO4F的电化学性能的双重增强。希望这些发现能为改善多离子化合物的电化学性能提供思路。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.