Figure 7

Si/Sn composite nanowire anodes after charge–discharge cycles. (a) SEM surface images of the Si/Sn composite nanowire anode with a spider-web-like network structure before and after 100 cycles. (b) TEM image and TEM–EDX mapping images of the Si/Sn nanowire anode with a spider-web-like network structure after 100 cycles.