In situ growth of Si nanowires on graphene sheets for Li-ion storage
Tay, Yee Yan
Hng, Huey Hoon
Date of Issue2012
School of Materials Science and Engineering
Energy Research Institute @NTU
TUM CREATE Centre for Electromobility
Si nanowires in graphene papers were successfully prepared by supercritical fluid–liquid–solid (SFLS) process, which showed high specific capacities and charge–discharge cycling stability as anode materials for Li-ion storage. The enhancement on capacity and cycling stability of the Si/graphene composite nanostructures was attributed to the presence of graphene papers in the hybrid samples that served as a highly conductive framework and absorption of volume changes of Si nanowires during the lithiation/delithiation process. This Si/graphene electrodes maintained reversible capacities of 1400 mAh g−1 for the 30th cycle at a current density of 420 mA g−1, which is much better as compared to that of pure Si nanowires.
© 2012 Elsevier Ltd.