Liu Huan, Zhang Xin, Zhu Yifan, Cao Bin, Zhu Qizhen, Zhang Peng, Xu Bin, Wu Feng, Chen Renjie
School of Materials Science and Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China.
State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China.
Nanomicro Lett. 2019 Aug 2;11(1):65. doi: 10.1007/s40820-019-0296-7.
MXenes, a new family of two-dimensional (2D) materials with excellent electronic conductivity and hydrophilicity, have shown distinctive advantages as a highly conductive matrix material for lithium-ion battery anodes. Herein, a facile electrostatic self-assembly of SnO quantum dots (QDs) on TiCT MXene sheets is proposed. The as-prepared SnO/MXene hybrids have a unique 0D-2D structure, in which the 0D SnO QDs (~ 4.7 nm) are uniformly distributed over 2D TiCT MXene sheets with controllable loading amount. The SnO QDs serve as a high capacity provider and the "spacer" to prevent the MXene sheets from restacking; the highly conductive TiCT MXene can not only provide efficient pathways for fast transport of electrons and Li ions, but also buffer the volume change of SnO during lithiation/delithiation by confining SnO QDs between the MXene nanosheets. Therefore, the 0D-2D SnO QDs/MXene hybrids deliver superior lithium storage properties with high capacity (887.4 mAh g at 50 mA g), stable cycle performance (659.8 mAh g at 100 mA g after 100 cycles with a capacity retention of 91%) and excellent rate performance (364 mAh g at 3 A g), making it a promising anode material for lithium-ion batteries.
MXenes是一类新型二维材料，具有优异的电子导电性和亲水性，作为锂离子电池负极的高导电基体材料已展现出独特优势。在此，我们提出一种在TiCT MXene片材上简便的静电自组装SnO量子点（QDs）的方法。所制备的SnO/MXene杂化物具有独特的0D-2D结构，其中0D的SnO量子点（约4.7纳米）以可控的负载量均匀分布在二维TiCT MXene片材上。SnO量子点作为高容量提供者和“间隔物”，可防止MXene片材重新堆叠；高导电的TiCT MXene不仅能为电子和锂离子的快速传输提供有效途径，还能通过将SnO量子点限制在MXene纳米片之间来缓冲SnO在锂化/脱锂过程中的体积变化。因此，0D-2D SnO量子点/MXene杂化物具有优异的锂存储性能，包括高容量（在50 mA g时为887.4 mAh g）、稳定的循环性能（在100 mA g下循环100次后为659.8 mAh g，容量保持率为91%）和出色的倍率性能（在3 A g时为364 mAh g），使其成为一种有前景的锂离子电池负极材料。
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