K2[(VOHPO4)2(C2O4)]·2H2O as a high-potential cathode material for potassium-ion batteries

Battery Energy Pub Date : 2024-04-21 DOI:10.1002/bte2.20240006

Xiaogang Niu, Nan Li, Yifan Chen, Jianwen Zhang, Yusi Yang, Lulu Tan, Linlin Wang, Zhe Zhang, Stanislav S. Fedotov, Dmitry Aksyonov, Jianghao Wu, Lin Guo, Yujie Zhu

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Abstract

Potassium-ion batteries (KIBs) represent a promising energy storage solution owing to the abundance of potassium resources. The efficacy of KIBs relies significantly on the electrochemical attributes of both their electrode materials and electrolytes. In the current investigation, we synthesized a layered compound K₂[(VOHPO₄)₂(C₂O₄)]·2H₂O via a heterogeneous nucleation approach and assessed its viability as a cathode material for KIBs. When integrated with a salt-concentrated electrolyte with oxidation stability over 6 V, the compounds exhibit a high discharge potential of 4.1 V (vs. K⁺/K) alongside a reversible capacity of 106.2 mAh g⁻¹. Furthermore, there is no capacity decay after 500 cycles at 100 mA g⁻¹. This study shows the promise of layered metal organic frameworks as high-potential materials for KIBs.

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作为钾离子电池高电位阴极材料的 K2[(VOHPO4)2(C2O4)]-2H2O

由于钾资源丰富，钾离子电池（KIB）是一种前景广阔的储能解决方案。钾离子电池的功效在很大程度上取决于其电极材料和电解质的电化学特性。在目前的研究中，我们通过异质成核方法合成了一种层状化合物 K2[(VOHPO4)2(C2O4)]-2H2O 并评估了其作为 KIB 阴极材料的可行性。当与氧化稳定性超过 6 V 的浓盐电解质结合时，化合物表现出 4.1 V 的高放电电位（相对于 K+/K）以及 106.2 mAh g-1 的可逆容量。此外，在 100 mA g-1 的条件下循环 500 次后，容量也没有衰减。这项研究表明，层状金属有机框架有望成为 KIB 的高电位材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Battery Energy

CiteScore

4.60

自引率

0.00%

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