多孔Ag@Ni泡沫金属的制备及其在非水性锂空气电池上的应用

通过改进的置换反应,以三维网状结构泡沫镍为基底,制备了新型多孔Ag/Ni复合泡沫金属材料(Ag@Ni泡沫金属)。X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线能谱(EDS)表明,泡沫镍基底上生成的金属Ag颗粒呈枝晶状且分布均匀。将其作为集流体首次应用于锂空气一次电池正极,通过线性伏安扫描(LSV)、电化学阻抗(EIS)和充放电测试研究了电极的电化学性能,结果表明,这种Ag@Ni泡沫金属作为锂空气一次电池的氧气极集流体,明显提高了还原反应的催化活性,改善了电化学反应性能,电流密度0.1 mA/cm2时,放电电压平台从2.66升高到2.73 V,容量也由2000 mAh/g增大到2750 mAh/g,且大电流密度下改善更为明显。

Preparation of Porous Ag@Ni Foam and Its Application for Non-aqueous Lithium-air Batteries

A novel three-dimensional structured foam Ag@Ni composite material was prepared by improved cell galvanic reaction using Ni foam as substrate. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) results show that the formed Ag particles are dendrite and homogenously precipitated on the surface of Ni foam. The as-prepared porous Ag@Ni foam was applied as the current collector of air cathode for the Li-air battery, and the electrochemical performances were evaluated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic discharge. The results show that the Ag@Ni foam-supported air cathode exhibits an enhanced catalytic effect for oxygen reduction reaction (ORR) and improved discharge performances. When the current density is 0.1 mA/cm2, the discharge voltage platform increases from 2.66 to 2.73 V, and the capacity increases from 2000 to 2750 mAh/g. Furthermore, the improvement is more significant at higher current density.