Abstract
Semiconducting silicon (Si) nanomaterials have great potential for the applications in electronics, physics, and energy storage fields. However, to date, it is still a challenge to realize the batch production of Si nanomaterials via efficient and low-cost approaches, owing to some long-standing shortcomings, e.g., complex procedures and time and/or energy consumption. Herein, we report a green and inexpensive method to rapidly obtain two-dimensional (2D) free-standing Si/SiOx nanosheets via the rapid thermal exfoliation of layered Zintl compound CaSi2. With the help of the rapid exfoliation reaction of CaSi2 in the atmosphere of greenhouse gas CO2, and the following mild sonication, 2D free-standing Si/SiOx nanosheets can be produced with very high yield. After applying the coating of a thin carbon outer layer, the electrodes of Si/SiOx/C nanosheets serving as the anodes for lithium-ion batteries exhibit ultrahigh reversible capacity and outstanding electrochemical stability. We expect this study will provide new insights and inspirations for the convenient and batch production of nanostructural Si-based anode materials towards high-performance lithium-ion batteries.
摘要
半导体硅(Si)纳米材料在电子、物理、储能等领域有着广阔的 应用前景. 然而, 到目前为止, 由于一些长期存在的难题, 如制备工艺复 杂, 时间、能耗较大等, 通过高效低成本的途径实现纳米硅材料的规模 化生产依然具有挑战. 在本工作中, 我们报道了一种绿色、廉价的纳米 Si材料的制备方法: 通过CO2快速热剥离层状Zintl相化合物CaSi2高产 率地制备二维超薄Si/SiOx纳米片. 我们发现CaSi2可以在一定条件下和 CO2稳定反应. 利用此特性并借助温和超声处理, 可以高产量制备出超 薄Si/SiOx纳米片. 通过导电化处理, 得到Si/SiOx/C复合纳米片. 该复合 材料作为锂离子电池的负极材料, 具有较高的可逆容量和优异的电化 学稳定性. 我们希望本研究能为批量生产高容量锂离子电池的硅基纳 米结构材料提供新的思路.
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Acknowledgements
This work was financially supported by the National Key Research and Development Program of China (2017YFA0208200 and 2016YFB0700600), the Fundamental Research Funds for the Central Universities of China (0205-14380219), the Projects of National Natural Science Foundation of China (22022505, 21872069 and 51761135104), the Natural Science Foundation of Jiangsu Province (BK20181056, BK20180008 and BK20191042), Jiangsu Postdoctoral Science Fundation (2020Z258), and the Funding for School-level Research Projects of Yancheng Institute of Technology (xjr2019006).
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Sun L and Jin Z conceived and designed the study; Sun L, Xie J and Huang S performed the synthesis and electrochemical test; Liu Y and Zhang L performed the SEM and TEM measurements; Wu J contributed to the reaction mechanism analysis. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.
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Lin Sun received his MSc degree in chemical engineering, from the School of Petrochemical Engineering, Changzhou University. He obtained the PhD degree in chemistry from Nanjing University. His research interests are focused on organic/inorganic porous materials for adsorption, separation, catalysis, optoelectronics, and energy science by using new synthetic methods and strategies under the guidance of modern computational chemistry.
Zhong Jin received his BSc (2003) and PhD (2008) in chemistry from Peking University. He worked as a postdoctoral scholar at Rice University and Massachusetts Institute of Technology. Now he is a professor at the School of Chemistry and Chemical Engineering, Nanjing University. He leads a research group on functional nanomaterials and devices for energy conversion and storage.
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The authors declare no conflict of interest.
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Rapid CO2 exfoliation of Zintl phase CaSi2-derived ultrathin free-standing Si/SiOx/C nanosheets for high-performance lithium storage
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Sun, L., Xie, J., Huang, S. et al. Rapid CO2 exfoliation of Zintl phase CaSi2-derived ultrathin free-standing Si/SiOx/C nanosheets for high-performance lithium storage. Sci. China Mater. 65, 51–58 (2022). https://doi.org/10.1007/s40843-021-1708-6
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DOI: https://doi.org/10.1007/s40843-021-1708-6