Abstract
Tin selenides have been attracting great attention as anode materials for the state-of-the-art rechargeable sodium-ion batteries (SIBs) due to their high theoretical capacity and low cost. However, they deliver unsatisfactory performance in practice, owing to their intrinsically low conductivity, sluggish kinetics and volume expansion during the charge-discharge process. Herein, we demonstrate the synthesis of SnSe2 nanocrystals coupled with hierarchical porous carbon (SnSe2 NCs/C) microspheres for boosting SIBs in terms of capacity, rate ability and durability. The unique structure of SnSe2 NCs/C possesses several advantages, including inhibiting the agglomeration of SnSe2 nanoparticles, relieving the volume expansion, accelerating the diffusion kinetics of electrons/ions, enhancing the contact area between the electrode and electrolyte and improving the structural stability of the composite. As a result, the as-obtained SnSe2 NCs/C microspheres show a high reversible capacity (565 mA h g−1 after 100 cycles at 100 mA g−1), excellent rate capability, and long cycling life stability (363 mA h g−1 at 1 A g−1 after 1000 cycles), which represent the best performances among the reported SIBs based on SnSe2-based anode materials.
摘要
硒化锡用于钠离子电池负极时具有较高的理论比容量且其 成本低廉, 因而备受关注. 然而, 由于其固有的低导电性, 以及在充 放电过程中的缓慢动力学和体积膨胀, 硒化锡作为钠离子电池负 极材料表现出的性能较差. 本文首次合成SnSe2纳米晶耦合分层多 孔碳微球(SnSe2 NCs/C)用于增强钠离子电池的比容量、倍率能力 和持久性. SnSe2 NCs/C独特的结构可以有效阻止SnSe2纳米晶的团 聚, 减轻材料体积膨胀, 加快电子和离子的扩散, 增大电解液与电极 材料的接触面积, 提高材料结构的稳定性. 所制备的SnSe2 NCs/C微 球具有较高的可逆比容量(在100 mA g−1的电流密度下循环100圈 后仍保持565 mA h g−1的比容量), 出色的倍率能力和长循环寿命稳 定性(在1 A g−1的电流密度下循环1000圈后仍保持363 mA h g−1的 比容量).
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Acknowledgements
This work was supported by the National Key R&D Research Program of China (2016YFB0100201), Beijing Natural Science Foundation (JQ18005), the National Natural Science Foundation of China (51671003, 21802003), China Postdoctoral Science Foundation (2019TQ0001), and the start-up supports from Peking University and Young Thousand Talented Program.
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Guo S conceived the project and directed the experiment. Chen H designed the experiments. Chen H, Mu Z and Li Y prepared and carried out the main experiments and characterization. Chen H wrote the manuscript. All authors contributed to the data analysis, discussed the results, and commented on the manuscript.
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Supplementary information Experimental details and supporting data are available in the online version of the paper.
Hui Chen is a PhD student of the University of Electronic Science and Technology of China under the supervision of Prof. Jinshu Wang. Currently, he is studying at Peking University as an exchange student in Prof. Shaojun Guo’s group. His research interests include the synthesis and characterization of nanomaterials for alkali-ion batteries, photocatalysis and perovskite solar cells.
Shaojun Guo received his BSc degree in Jilin University (2005) and PhD degree in the Chinese Academy of Sciences (2010). He worked as a postdoctoral researcher associate at Brown University (2011-2013) and as a prestigious Oppenheimer Distinguished Fellow at Los Alamos National Laboratory (2013-2015). He joined the College of Engineering, Peking University in 2015 and is currently a Professor. His research interests focus on engineering nanocrystals and 2D materials for catalysis, renewable energy, optoelectronics and biosensors.
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Chen, H., Mu, Z., Li, Y. et al. SnSe2 nanocrystals coupled with hierarchical porous carbon microspheres for long-life sodium ion battery anode. Sci. China Mater. 63, 483–491 (2020). https://doi.org/10.1007/s40843-019-1229-0
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DOI: https://doi.org/10.1007/s40843-019-1229-0