Abstract
Constructing potential anodes for sodium-ion batteries (SIBs) with a wide temperature property has captured enormous interests in recent years. Fe1−xS, a zero-band gap material confirmed by density states calculation, is an ideal electrode for fast energy storage on account of its low cost and high theoretical capacity. Herein, Fe1−xS nanosheet wrapped by nitrogen-doped carbon (Fe1−xS@NC) is engineered through a post-sulfidation strategy using Fe-based metal-organic framework (Fe-MOF) as the precursor. The obtained Fe1−xS@NC agaric-like structure can well shorten the charge diffusion pathway, and significantly enhance the ionic/electronic conductivities and the reaction kinetics. As expected, the Fe1−xS@NC electrode, as a prospective SIB anode, delivers a desirable capacity up to 510.2 mA h g−1 at a high rate of 8000 mA g−1. Additionally, even operated at low temperatures of 0 and −25°C, high reversible capacities of 387.1 and 223.4 mA h g−1 can still be obtained at 2000 mA g−1, respectively, indicating its huge potential use at harsh temperatures. More noticeably, the full battery made by the Fe1−xS@NC anode and Na3V2(PO4)2O2F cathode achieves a remarkable rate capacity (186.8 mA h g−1 at 2000 mA g−1) and an impressive cycle performance (183.6 mA h g−1 after 100 cycles at 700 mA g−1) between 0.3 and 3.8 V. Such excellent electrochemical performance is mainly contributed by its pseudocapacitive dominated behavior, which brings fast electrode kinetics and robust structural stability to the whole electrode.
摘要
近年来, 构筑适用于宽温度范围的钠离子电池负极材料越来越引起人们的研究兴趣. Fe1−xS作为一种典型的零带隙材料, 由于其低的成本和高的理论比容量, 被认为是钠离子电池理想的负极材料. 本文以室温合成的Fe金属有机骨架(Fe-MOF)为前驱体, 借助硫化处理制备了木耳状氮掺杂碳包覆的Fe1−xS化合物(Fe1−xS@NC). Fe1−xS@NC独特的木耳状结构可以很好地缩短电荷扩散路径, 显著提高离子/电子电导率, 促进反应的动力学过程. 该Fe1−xS@NC电极在8000 mA g−1的高电流密度下展示了高达510.2 mA h g−1的理想比容量. 即使在0和−25°C的工作环境中, 该电极在2000 mA g−1的电流密度下仍能分别保持387.1和223.4 mA h g−1的可逆比容量, 证实了该电极在严苛温度下的潜在应用. 更值得注意的是, 由Fe1−xS@NC负极和Na3V2(PO4)2O2F正极组装的全电池在0.3和3.8 V 之间同样呈现了出色的倍率容量(在2000 mA g−1电流密度下的可逆容量为186.8 mA h g−1)和优异的循环性能(在700 mA g−1电流密度下、经过100个循环后可维持183.6 mA h g−1可逆容量). 定量动力学分析进一步证实该电极是电容行为为主的电荷存储, 这种特质可加速电极电化学动力学反应过程, 从而赋予Fe1−xS@NC优异的电化学性能.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (21873018, 21573036 and 21274017), and the open project of Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis (130028655). Jilin Provincial Research Center of Advanced Energy Materials (Northeast Normal University) is gratefully acknowledged.
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Author contributions Fan H and Qin B designed and prepared the materials; Wang Z finished the theoretical calculation; Li H supervised the revision of the paper; Guo J synthesized the cathode materials; Wu X and Zhang J supervised the analysis of the whole work. All authors took part in the general discussion.
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Conflict of interest The authors declare that they have no conflict of interest.
Supplementary information Supporting data are available in the online version of the paper.
Honghong Fan received her bachelor degree in South-Central University for Nationalities in 2015. Now she is a PhD candidate in Northeast Normal University. Her research topic is mainly focused on the synthesis of metal sulfides/oxides and their composites for energy storage devices.
Xinglong Wu received his PhD from the Institute of Chemistry, Chinese Academy of Sciences (ICCAS) in 2011. After continuing a two-years postdoctoral working at ICCAS, he moved to Northeast Normal University as an associate professor in 2013, and became a full professor in 2018. His current research interests focus on the advanced materials for energy storage devices such as Na/K/Li-ion batteries and dual-ion batteries, and the reuse and recycle of spent Li-ion batteries.
Jingping Zhang is a full professor of physical chemistry of Northeast Normal University, China. She got her BSc in chemistry, MSc in physical chemistry, PhD in inorganic chemistry at Northeast Normal University. Currently, Dr. Zhang’s research focuses on the mechanism for novel organic reaction and the design of functional materials such as lithium/sodium ion battery materials. She has published more than 300 papers in reputed journals.
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Fan, H., Qin, B., Wang, Z. et al. Pseudocapacitive sodium storage of Fe1−xS@N-doped carbon for low-temperature operation. Sci. China Mater. 63, 505–515 (2020). https://doi.org/10.1007/s40843-019-1220-2
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DOI: https://doi.org/10.1007/s40843-019-1220-2