溅射时间对Sb薄膜负极材料循环性能的影响

Influence of sputtering time on cyclic performance of Sb thin films as anodes of lithium ion battery

采用射频磁控溅射法在300W功率下分别镀膜15、30、45min,制备了三种锂离子电池用Sb薄膜负极材料。通过XRD、SEM、ICP、恒电流充放电对三种薄膜材料的结构、形貌及循环性能等进行了表征。实验结果表明,当溅射时间为30min时,Sb薄膜电极具有最好的循环性能,首次嵌锂容量高达640mAh/g,20次循环后容量维持在323mAh/g,容量保持率为51%。

Three kinds of Sb thin films as anodes of lithium ion battery were fabricated by radio frequency magnetron sputtering with sputtering time of 15, 30 min and 45 min, respectively. The crystal structure, morphology and cyclic performance of the films were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Coupled Plasma Spectroscopy （ICP） and the galvanostatic charge/discharge （GC） measurements. The experimental results show that the Sb electrode shows the best cyclic stability when the sputtering time is 30 min. Its initial discharge capacity is 640 mAh/g and it keeps 323 mAh/g after 20 cycles, 51% of the former.