Electrochemical performances of nanorod structured Si_(1-x)Ge_x anodes

摘要

Nanorod structured Si_(1-x)Ge_x anodes have been prepared by depositing Si_(1-x)Ge_x coatings onto the electrodeposited Ni nanocone arrays for high capacity Li-ion batteries. The obtained samples were characterized by field emission scanning electron microscopy. The electrochemical performance was evaluated by a galvanostatic battery testing. It is found that Si_(1-x)Ge_x nanorod displays obvious improved electrochemical performance compared to the pristine film anode. The increase of the Ge content for the Si_(1-x)Ge_x anode can improve the capacity retention greatly while retain a rather high capacity. For Si_(0.71)Ge_(0.29) anode, the charge capacity remains 841 mA h/g after 101 cycles, surpassing the Si anode of 662 mA h/g.