Abstract:Effect of Cu3Si component on electrochemical lithium-storage performance of active silicon was studied with Cu3Si/Si composite as lithium-ion battery anode. The results suggest that Cu3Si component is inactive to lithium insertion, but can improve cycling and rate capacities of active silicon material. The first lithiation specific capacity of anode is 1 345 mAh/g with initial columbic efficiency of 88.37% under charging/discharging current density of 200 mA/g. After cycling for 100 times, reversible specific capacity of anode is as high as 698.7 mAh/g. Cu3Si/Si anode exhibits excellent rate capacities with specific capacity of 1 346.22, 754.33 and 564.78 mAh/g at current density of 200, 500 and 1 000 mA/g, respectively. As current returns to 200 mA/g, reversible specific capacity is 1 030.58 mAh/g.