喷射电沉积制备集流体用多孔金属镍及相应电化学电容器的性能  

Preparation of Porous Metal Nickel Used for Current Collector with Jet Electrodeposition and Electrochemical Capacitor Properties

作　　者：宫凯[1] 黄因慧[1] 田宗军[1] 刘志东[1] 王桂峰[1] 

机构地区：[1]南京航空航天大学江苏省精密与微细制造技术重点实验室,南京210016

出　　处：《机械工程材料》2011年第10期62-65,69,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50575104)

摘　　要：采用喷射电沉积工艺制备了多孔金属镍,并利用X射线衍射仪、扫描电镜等对其进行了表征;并以多孔金属镍为电化学电容器集流体,以纳米NiO为电活性物质组装成电化学电容器,采用循环伏安曲线、恒流充放电和交流阻抗、循环寿命等方法对电容器进行了电化学性能测试。结果表明:制备的多孔金属镍纯度较高,枝状晶围成三维连通孔隙,通孔分布均匀,比表面积大;该电化学电容器具有良好的电化学电容特性和电化学稳定性;电流密度为10mA.cm-2时,其初次放电比电容为589.2F.g-1,经过200次恒流循环充放电后放电比电容仅衰减了1.7%。Porous metal nickel was prepared by jet electrodeposition technology and then was characterized by X-ray diffractermeter and scaning elecrtron microscopy. Use porous metal nickel as electrochemical capacitor current collector and nano-NiO as electroactive material to fit electrochemical capacitor. Electrochemical properties were tested by cyclic voltammetry curve, constant-current charge and discharge, A.C. impedance, cycle life and so on. The results show that the porous metal nickel prepared by the method had higher purity, dendritic crystal formed three-dimensional communicating pores, and the pores had uniform distribution and larger specific surface area. The electrochemical capacitor had better electrochemical capacitor property and dectrochemieal stability. The capacitance of the first discharge capacitor was 589. 2 F · g-1 when current density was 10 mA ·cm-2 , and the discharge capacitor reduced by 1.7% only after constant current charge and discharge for 200 cycles.

关 键 词：多孔金属镍 枝状晶 喷射电沉积 电化学电容器 

分 类 号：TG146[一般工业技术—材料科学与工程]