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Dual Bonds Enhanced Multi-Dimensional Constructed Composite Silicon Anode for High Performance Lithium Ion Batteries.

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 bonds restricted MXene-Si-CNT composite anode materials with enhanced electrochemical performance is reported. These dual bonds have been clearly revealed by X-ray photoelectron spectroscopy technique and also proven by the theoretical calculations with spontaneous reaction energy values (-0.190 eV/atom 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 multi-dimensional constructed architecture. The MXene-Si-CNT composite with 60 wt.% silicon possesses the best overall performance with ~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 on other anode materials with serious volumetric change problems during cycling process.