Nanometer copper–tin alloy anode materials with amorphous structure were prepared by a reverse microemulsion technique for lithium-ion
batteries. It was found that the electrochemical performance of alloy was influenced by its particle size, which was controlled by appropriate
surfactant content. The nanometer copper–tin alloy with particle size of 50–60 nm presented the best performance, showing a reversible specific
capacity of 300mAh/g over the full voltage range 0.0–1.2V and capacity retention of 93.3% at 50 cycles. A great irreversible capacity was caused
by the formation of a SEI layer on the surface of nanometer alloy. The contact resistance between nanometer particles resulted in the poor electric
conductivity and the match of particle size and conductive agent content had a great impact on the electrochemical performance of the nanometer
copper–tin alloy anode.