<br>探索 KTiPO4F 作为钾离子电池的坚固聚阴离子阳极材料,Journal of Materials Chemistry A

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探索 KTiPO4F 作为钾离子电池的坚固聚阴离子阳极材料
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-05-29 , DOI: 10.1039/d3ta08103f
Vahid Ramezankhani ₁ , Nikita D. Luchinin ₂ , Sergey N. Marshenya ₂ , Maxim V. Zakharkin ₃ , Alexander A. Golubnichiy ₂ , Anatolii V. Morozov ₂ , Olga Emilianova ₂ , Keith J. Stevenson ₃ , Evgeny V. Antipov _{2,

3} , Artem M. Abakumov ₂ , Stanislav S. Fedotov ₂

Affiliation

由于含钛材料在电池中的环境友好性、丰富性和良好的电化学性能，引起了学术界的关注。在此，我们报道了 KTiPO ₄ F 作为一种新型含钛聚阴离子负极（阳极）材料，具有坚固的骨架结构，通过简便的水热合成路线获得。利用X射线粉末衍射、电子显微镜和光谱方法对KTiPO ₄ F的化学成分、颗粒形貌以及电子和晶体结构进行了综合分析。当使用 1 M KPF ₆ 电解质对金属 K 进行测试时，碳涂层 KTiPO ₄ F 显示出卓越的 K 离子存储特性，可提供约 130 mAh g ⁻¹ 下，在 0.001–3.0 V vs. K/K ⁺ 电位范围内对称充电/放电（1C 倍率），1000 次循环后容量保持率为 97% 。该聚阴离子阳极通过类似固溶体的脱/插入机制，在平均电势仅为 0.8 V vs. K/K ⁺ 的情况下工作，显示电池体积变化为 8.5%——现代基准中的最低值钾离子电池电极材料。首次组装并测试了全对称钾离子 KTiPO ₄ F‖KTiPO ₄ F 电池。这项工作用新的聚阴离子代表补充了钾离子电池阳极材料的可用范围，从而扩展了开发前沿。

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Exploring KTiPO4F as a robust polyanion anode material for potassium-ion batteries

Because of the environmental benignity, abundance, and promising electrochemical properties of Ti-containing materials in batteries, these materials have been attracting the attention of the academic community. Herein, we report on KTiPO₄F as a novel Ti-containing polyanionic negative electrode (anode) material with a robust framework structure, which is obtained via a facile hydrothermal synthesis route. A comprehensive analysis of the chemical composition, particle morphology, and electronic and crystal structure of KTiPO₄F is performed using X-ray powder diffraction, electron microscopy, and spectroscopy methods. When tested against metallic K with a 1 M KPF₆ electrolyte, the carbon-coated KTiPO₄F reveals remarkable K-ion storage properties, delivering around 130 mA h g⁻¹ at 130 mA g⁻¹ with symmetric charge/discharge (1C rate) in the 0.001–3.0 V vs. K/K⁺ potential range with 97% capacity retention after 1000 cycles. This polyanion anode operates at an average potential of only 0.8 V vs. K/K⁺ via a solid-solution-like de/insertion mechanism showing a cell volume change of 8.5% – the lowest value among modern benchmark electrode materials for potassium-ion batteries. A full symmetric K-ion KTiPO₄F‖KTiPO₄F cell is for the first time assembled and tested. This work complements the available range of anode materials for K-ion batteries with a new polyanionic representative thus extending the development frontiers.

更新日期：2024-05-29

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