中文摘要：

采用磁控溅射共溅法，在铜箔和泡沫铜基底上分别制备了平面和三维网状结构的Sn-Al／Cu复合薄膜．表征了其结构，并研究了其作为锂离子电池负极材料的电化学性能．结果表明，三维网状结构的电化学性能明显优于平面复合薄膜，表现出很好的循环性能和倍率性能：以600mA／g电流密度充放电，三维网状结构的复合薄膜有较好的容量保持率，循环50周后容量保持在410mA·h／g；以2000mA／g电流密度充放电，再以500mA／g电流密度进行充放电，三维网状结构的复合薄膜仍有464mA·h／g的放电容量．三维网状结构的Sn—Al复合薄膜能抑制充放电时带来的体积膨胀，较大的表面积和粗糙表面可以使其与锂充分反应，改善其电化学性能．

英文摘要：

Sn-Al/Cu composite thin films with planar and three dimensional（3D） network structures, which were prepared by co-sputtering method on copper foil or foam, were used as the anode materials of Li-ion batteries. The phase structure and surface morphology of Sn-Al composite thin films were characterized by X-ray diffraction（XRD） and scanning electron microscopy （SEM）. The electrochemical performance of Sn-Al com- posite thin films was evaluated with charge/discharge and electrochemical impedance spectroscopy （ EIS ） at room temperature. The results showed that Sn-Al composite thin films with 3D network structure displayed a capacity of 410 mA · h/g after 50 cycles at a current density of 600 mA/g, and a capacity of 464 mA · h/g at a current density of 2000 mA/g. The improved electrochemical performance such as cycling stability and columbic efficiency is attributed to the 3D network structure, which can obviously restrain the volume change of Sn-Al composite thin film during the insertion/extraction process of lithium ion. In addition, copper foam with large specific surface area and rough surface can promote the reaction with lithium sufficiently.