中文摘要：

采用磁控溅射沉积技术制备了纳米级Sn-Ti合金负极材料,并用X射线衍射和扫描电子显微镜进行表征,用高精度电池测试系统进行充放电和循环伏安测试.结果表明先镀Sn后镀Ti（Sn/Ti复合膜）和先镀Ti后镀Sn（Ti/Sn复合膜）具有很大的性能差异,其中Sn/Ti复合膜具有优异的循环稳定性和较高的可逆容量.首次放电容量和充电容量分别为927·5mAh/g和695·4mAh/g,首次库仑效率为75%,经30次循环后,该电极的放电容量保持为415·2mAh/g,这主要归因于活性物质Sn与电解液界面之间存在非活性物质Ti的隔离保护作用.

英文摘要：

Nano-sized Sn-Ti alloy anode material prepared by magnetic sputtering was characterized with X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The charge/discharge and cyclic voltammograms of the films electrodes were tested by the high precision battery testing system. The results indicated that the Sn/Ti compound films and Ti/Sn compound films have large difference in performance. Sn/Ti compound films have excellent cycling stability and tolerably high reversible capacity. Its initial discharge specific capacity and charge specific capacity are 927.5 mAh/g and 695.4 mAh/g, respectively,and the initial capac ity fade is 25%. After 30 cycles,specific discharge capacity of 415.2 mAh/g was retained and the coulombic efficiency was the same as the value before 30 cycles. This is ascribed to the isolation effect of inactive element Ti between active element Sn and the electrolyte.