Facile synthesis of two-dimensional carbon/Si composite assembled by ultrasonic atomization-assisted-ice template technology as electrode for lithium-ion battery

Si-based anode materials are desirable candidates for high performance lithium-ion batteries (LIBs) due to their high capacity and low operating voltage. The major challenge is improvement the conductivity of Si-based electrode while maintaining structural stability during cycling. Herein, the two-dimensional (2D) carbon/Si composite materials are designed through a facile ultrasonic atomization-assisted-ice template (UAIT) approach. The high frequency ultrasound incorporate ice template route have the ability to promote the Si NPs uniformly disperse and firmly anchor in nanosheets. The hierarchical interconnected 2D nanosheets can not only ensure an electrically conductive network but also buffer the volume variation of Si nanoparticles (NPs) during (de)lithiation. The NPCN/Si-2 anode delivers improved reversible capacity of 1977 mAh g(-1) after 100 cycles at 100 mA g(-1), and stable capacity of 889 mAh g 1 even after 1000 cycles at 1000 mAh g(-1), respectively. This work provides an environmentally friendly and facile route to fabricate the hybrid of nanoparticles and 2D carbonaceous nanomaterials as electrodes in lithium-ion batteries.