Tuning Silicon Nanorods for Anodes of Li-Ion Rechargeable Batteries

Abstract

Silicon is a promising anode material for Li-ion batteries in regarding of high capacity, low cost and safety, but it suffers poor cycling stability due to the pulverization induced by severe volume expansion/shrinkage (297%) during lithium insertion/extraction. In our previous investigation on aluminum nanorods anodes, it is found the selection of substrates in which Al nanorods grown plays the significant role in prevention of pulverization resulting in the increase of cycling life [1]. Adapting this knowledge, we investigated the Si based nanorods by tuning its composition and element distribution. Our results show that the Si-Cu composite nanorods demonstrated sustainable capacity of 500 mAh/g in 100 cycles attributing to its flexible and less brittle nature.