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The development of silicon-based anode materials is important for improving the energy density of current lithium ion batteries. However, there are still strong demands for these materials with better cycle stability and higher reversible capacity. Here, a kind of dual bond restricted MXene-Si-CNT composite anode materials with enhanced electrochemical performance is reported. These dual bonds have been clearly revealed by an X-ray photoelectron spectroscopy technique and also proven by theoretical calculations with spontaneous reaction energy values (-0.190 and -0.429 eV/atom for Ti-Si and C-Si bonds, respectively). The cycle stability of the composites, prepared by a facile ball-milling synthetic method, can obviously be improved because of the existence of these dual bonds and the multidimensional constructed architecture. The MXene-Si-CNT composite with 60 wt % silicon possesses the best overall performance, with similar to 80% capacity retention after 200 cycles, and achieves 841 mAh g(-1) at 2 A g(-1). This approach demonstrates a promising strategy to exploit high-performance anode materials and lessens the immanent negative effect of silicon-based materials. Furthermore, it is significant to extend this method to other anode materials with serious volumetric change problems during the cycling process.
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ACS NANO
ISSN: 1936-0851
Year: 2019
Issue: 8
Volume: 13
Page: 8854-8864
1 7 . 1 0 0
JCR@2022
ESI Discipline: CHEMISTRY;
ESI HC Threshold:166
JCR Journal Grade:1
Cited Count:
WoS CC Cited Count: 91
SCOPUS Cited Count: 93
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0