Electrostatic Self-assembly of 0D–2D SnO2 Quantum Dots/Ti3C2T x MXene Hybrids as Anode for Lithium-Ion Batteries

Nano-Micro Letters

Huan Liu¹  Renjie Chen¹  Feng Wu¹  Bin Cao²  Xin Zhang²  Qizhen Zhu²  Yifan Zhu²  Peng Zhang²  Bin Xu² 

[1] School of Materials Science and Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology;State Key Laboratory of Organic-Inorganic Composites, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology;

关键词: MXene;    SnO2;    Quantum dots;    0D–2D hybrid;    Lithium-ion battery;   

DOI  :  10.1007/s40820-019-0296-7

来源: DOAJ

【 摘 要 】

Abstract 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 SnO2 quantum dots (QDs) on Ti3C2T x MXene sheets is proposed. The as-prepared SnO2/MXene hybrids have a unique 0D–2D structure, in which the 0D SnO2 QDs (~ 4.7 nm) are uniformly distributed over 2D Ti3C2T x MXene sheets with controllable loading amount. The SnO2 QDs serve as a high capacity provider and the “spacer” to prevent the MXene sheets from restacking; the highly conductive Ti3C2T x MXene can not only provide efficient pathways for fast transport of electrons and Li ions, but also buffer the volume change of SnO2 during lithiation/delithiation by confining SnO2 QDs between the MXene nanosheets. Therefore, the 0D–2D SnO2 QDs/MXene hybrids deliver superior lithium storage properties with high capacity (887.4 mAh g−1 at 50 mA g−1), stable cycle performance (659.8 mAh g−1 at 100 mA g−1 after 100 cycles with a capacity retention of 91%) and excellent rate performance (364 mAh g−1 at 3 A g−1), making it a promising anode material for lithium-ion batteries.

【 授权许可】

Unknown