Silicon and silicon-copper composite nanorods for anodes of Li-ion rechargeable batteries

摘要

We investigate the anode performance of Si-based nanorods by tuning its composition using an oblique (co)deposition technique. Our results show that pure Si nanorods have a higher initial anodic capacity of 1500mAhg~(-1) but the capacity diminishes after 50 cycles due to the morphological change and pulverization. By introducing approximately 70at.% Cu into Si nanorods, the Si-Cu composite nanorods demonstrate 500mAhg~(-1) of capacity sustainable in 100 cycles, which is attributed to the flexibility and improved toughness of Si-Cu composite nanorods.