Xu Yang, Bahmani Farzaneh, Wei Runzhe
Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ UK.
National & Local United Engineering Laboratory for Power Batteries, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 China.
Microsyst Nanoeng. 2020 Sep 21;6:75. doi: 10.1038/s41378-020-00188-0. eCollection 2020.
Potassium-ion batteries are an emerging energy storage technology that could be a promising alternative to lithium-ion batteries due to the abundance and low cost of potassium. Research on potassium-ion batteries has received considerable attention in recent years. With the progress that has been made, it is important yet challenging to discover electrode materials for potassium-ion batteries. Here, we report pyrrhotite Fe S microcubes as a new anode material for this exciting energy storage technology. The anode delivers a reversible capacity of 418 mAh g with an initial coulombic efficiency of ~70% at 50 mA g and a great rate capability of 123 mAh g at 6 A g as well as good cyclability. Our analysis shows the structural stability of the anode after cycling and reveals surface-dominated K storage at high rates. These merits contribute to the obtained electrochemical performance. Our work may lead to a new class of anode materials based on sulfide chemistry for potassium storage and shed light on the development of new electrochemically active materials for ion storage in a wider range of energy applications.
钾离子电池是一种新兴的储能技术，由于钾资源丰富且成本低廉，它有望成为锂离子电池的替代方案。近年来，钾离子电池的研究受到了广泛关注。随着研究的进展，开发钾离子电池的电极材料既重要又具有挑战性。在此，我们报道了磁黄铁矿FeS微立方体作为这种令人兴奋的储能技术的新型负极材料。该负极在50 mA g的电流密度下具有418 mAh g的可逆容量，初始库仑效率约为70%，在6 A g的电流密度下具有123 mAh g的出色倍率性能以及良好的循环稳定性。我们的分析表明，循环后负极的结构稳定性良好，并揭示了在高电流密度下以表面主导的钾存储方式。这些优点促成了所获得的电化学性能。我们的工作可能会催生一类基于硫化物化学的新型钾存储负极材料，并为在更广泛的能源应用中开发用于离子存储的新型电化学活性材料提供思路。
