Abstract
The ever-growing market demands for lithium ion batteries have stimulated numerous research efforts aiming at the exploration of novel electrode materials with higher capacity and long-term cycling stability. Two-dimensional (2D) nanomaterials and their heterostructures are an intense area of study and promise great potential in electrochemical lithium storage owing to their unique properties that result from structural planar confinement. Here we report a microwave chemistry strategy to integrate ultrathin SnO2 nanosheets into graphene layer to construct surface-to-surface 2D heterostructured architectures, which can provide unique structural planar confinement for highly reversible electrochemical lithium storage. The as-synthesized 2D SnO2/graphene heterostructures can exhibit high reversible capacity of 688.5 mA h g−1 over 500 cycles with excellent long-term cycling stability and good rate capability when used as anode materials for lithium ion batteries. The present work definitely reveals the advantages of 2D heterostructures featured with a surface-to-surface stack between two different nanosheets in energy storage and conversion devices.
摘要
对锂离子电池日益增长的市场需求已经引起巨大的研究热情来开发具有更高容量和超长循环性的新型电极材料. 而由于具有独特 的平面结构限域性能, 二维材料及其异质结构目前成为材料研究领域的热点, 并有望在电化学能量储存方面发挥巨大的潜力. 因此, 本文 借助于微波化学策略把超薄SnO2纳米片与石墨烯薄层耦合在一起构筑一种面对面型二维异质结构, 利用其独特的平面结构限域性能来获 得高可逆性的电化学储锂性能. 实验结果表明, 所制备的二维SnO2/石墨烯异质结构表现出良好的电化学性能, 连续500次循环之后其可逆 容量仍能保持在688.5 mA h g−1, 同时也具有很好的倍率性能. 本工作揭示了具有面对面型二维异质结构在能量储存与转化设备应用方面 的明显优势, 为新型电极材料的制备提供了更多选择.
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Acknowledgements
This work was supported by China Ministry of Science and Technology under Contract of 2016YFA (0202801), the National Natural Science Foundation of China (21521091, 21390393, U1463202, 21471089, 21671117, 21703219 and 21371023), and China Postdoctoral Science Foundation (2017M620738).
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Youqi Zhu received his PhD degree in 2016 at Beijing Institute of Technology. Since then, he did postdoctoral work with Prof. Yadong Li at Tsinghua University. His research interests focus on the design, preparation, and application of the ultrathin two-dimensional nanomaterials in energy storage and conversion and heterogeneous catalysis.
Dingsheng Wang received his BSc degree from the Department of Chemistry and Physics, University of Science and Technology of China in 2004, and his PhD degree from the Department of Chemistry, Tsinghua University in 2009, under the supervision of Prof. Yadong Li. He did his postdoctoral research at the Department of Physics, Tsinghua University, with Prof. Shoushan Fan. He joined the faculty of the Department of Chemistry, Tsinghua University in 2012.
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Zhu, Y., Cao, T., Li, Z. et al. Two-dimensional SnO2/graphene heterostructures for highly reversible electrochemical lithium storage. Sci. China Mater. 61, 1527–1535 (2018). https://doi.org/10.1007/s40843-018-9324-0
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DOI: https://doi.org/10.1007/s40843-018-9324-0