Three‐Dimensional Interconnected Network of Graphene‐Wrapped Silicon/Carbon Nanofiber Hybrids for Binder‐Free Anodes in Lithium‐Ion Batteries

A three‐dimensional (3D) silicon/carbon nanofiber–graphene (Si/CNF‐G) nanostructure is constructed by encapsulating Si nanoparticles in carbon nanofibers, followed by wrapping with graphene nanosheets. The graphene‐wrapped silicon/carbon nanofibers hybrids have the advantages of good dispersion of Si nanoparticles inside the 3D carbon network. Meanwhile, the 3D carbon network can also act as a current collector to promote charge transfer and maintain stable electrical contact of the Si nanoparticles. The resulting Si/CNF‐G composites can be used directly as binder‐free electrodes. The composite exhibits a stable capacity retention and a reversible capacity of 878 mAh g −1 for up to 100 cycles, along with a high rate capacity (514 mAh g −1 at 5.0 A g −1 ). These results provide a promising research platform for fabricating stable electrodes with improved electrochemical performance.