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. 2019 Aug 2;11(1):65.
doi: 10.1007/s40820-019-0296-7.

Electrostatic Self-assembly of 0D-2D SnO2 Quantum Dots/Ti3C2Tx MXene Hybrids as Anode for Lithium-Ion Batteries

Huan Liu #  1 , Xin Zhang #  2 , Yifan Zhu  2 , Bin Cao  2 , Qizhen Zhu  2 , Peng Zhang  2 , Bin Xu  3 , Feng Wu  1 , Renjie Chen  4
Affiliations

Electrostatic Self-assembly of 0D-2D SnO2 Quantum Dots/Ti3C2Tx MXene Hybrids as Anode for Lithium-Ion Batteries

Huan Liu et al. Nanomicro Lett. .

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 Ti3C2Tx 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 Ti3C2Tx 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 Ti3C2Tx 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.

Keywords: 0D–2D hybrid; Lithium-ion battery; MXene; Quantum dots; SnO2.

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Figures

Fig. 1
Fig. 1
Schematic illustration for the preparation of 0D–2D SnO2 QDs/MXene hybrids
Fig. 2
Fig. 2
a SEM image, b TEM image, c HRTEM image of 0D–2D SnO2 QDs/MXene hybrid. d SAED patterns of SnO2 QDs. e STEM image and corresponding elemental mapping images of Ti, C, Sn, and O
Fig. 3
Fig. 3
a XRD patterns, b Raman spectra of MXene, SnO2, and SnO2 QDs/MXene hybrid. XPS spectra of c MXene for high-resolution C 1s, d Ti 2p, e SnO2 QDs/MXene-52 for high-resolution C 1s, f Ti 2p
Fig. 4
Fig. 4
Electrochemical performances as anode in LIBs. a, b CV curves of SnO2 QDs/MXene at a scan rate of 0.1 mV s−1 in 0.01–2.5 V. c, d Charge/discharge curves of SnO2 QDs/MXene at 50 mA g−1
Fig. 5
Fig. 5
a Cycle stability, b rate performance of all the samples as LIB electrodes. c Comparison of rate capacity between the SnO2 QDs/MXene-52 and other MXene-based electrode materials reported for LIBs. d Nyquist plots of the SnO2 QDs/MXene-52 and the pure SnO2 electrodes; e energy storage mechanism of the 0D–2D SnO2 QDs/MXene hybrids
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