The Sn-Co alloys with different atom ratio（2∶1

4∶1

8∶1） were prepared by solid-state reducing reaction through mechanical ball milling.The structure and morphology of the products were characterized by means of powder X-ray diffraction and scanning electron microscopy.the elctrochemical performance of the materials used as lithium intercalation anode was investigated using simulated test cells.The experimental results reveal that the nanostructured amorphous CoSn

4

exhibite a relatively high initial discharge capacity（430 mAh/g） and good cycling stability

as it can still deliver a discharge capacity of 360 mAh/g after the 15th cycle

with a capacity retention ratio of 84%.