Interconnected silicon nanowires and silicon-based core-shell structures for high capacity Li-ion battery anodes.

摘要

Although silicon nanowires are usually studied for applications in thin film transistors, they are also used for energy storage, particularly as anodes for Li-ion batteries. We present here some strategies to improve their stability, based either on highly interconnected Si nanowwe arrays or on the use of NiSirSi coresheS structures. The slow capacity decrease of the anode, observed upon repeated charge-discharge cycling, arises from large volume expansion upon lithium insertion, which induces the detachment of some nanowires from their substrate. The use of interconnected wires or NiSix-Si core-shell structures is found to significantly improve the anode stability and relabigy upon cycling.