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以多孔铜为集流体制备Cu6Sn5合金负极及其性能
Fabrication and Performance of Cu6Sn5 Alloy Anode Using Porous Cu as Current Collector
【摘要】 以氢气泡为动力学模板电沉积获得多孔铜,并通过热处理增强其结构稳定性.进一步将多孔铜作为基底通过电沉积制备Cu-Sn合金负极.XRD结果给出其组成为Cu6Sn5合金,扫描电子显微镜(SEM)观察到Cu6Sn5合金电极为三维(3D)多孔结构.充放电结果指出,Cu6Sn5合金电极具有较好的充放电性能,其首次放电(嵌锂)和充电(脱锂)容量分别为735和571mAh·g-1,并且具有较好的容量保持率.运用电化学阻抗谱研究了Cu6Sn5合金电极在商业电解液中的界面特性.
【Abstract】 Porous Cu was fabricated by electrodeposition through a kinetic template of hydrogen bubbles. The product was subsequently annealed to increase its structural stability. The Cu-Sn alloy was then electrodeposited onto porous Cu which served as a current collector. X-ray diffraction (XRD) studies ascertained that the composition of the Cu-Sn alloy was Cu6Sn5 and scanning electron microscopy (SEM) investigations showed a three-dimensional (3D) porous structure of the electrode. The first charge/discharge capacities of the Cu6Sn5 alloy electrode were measured respectively at 735 and 571 mAh·g-1,and a good retention of the capacities has been determined. Interfacial properties of the Cu6Sn5 alloy electrode in a commercial electrolyte were also studied by electrochemical impedance spectroscopy (EIS).
【Key words】 Porous Cu current collector； Cu6Sn5 alloy； Lithium ion battery； Anode； Electrochemical impedance spectroscopy；
- 【文献出处】 物理化学学报 ,Acta Physico-Chimica Sinica , 编辑部邮箱 ,2009年04期
- 【分类号】TM912
- 【被引频次】32
- 【下载频次】587