【摘要】 以泡沫铅作为负极集流体制备了卷绕VRLA电池。采用计时电流法、循环伏安曲线、电化学阻抗谱和充放电实验研究了泡沫铅负极的电化学行为,结果表明:泡沫铅负极的真实表面积比铅箔负极的大,因此泡沫铅负极具有较低的过电势,并且不论是在怎样的放电状态下,泡沫铅负极的电化学反应电阻较小;与铅箔负极相比,在10、5和2小时率放电状态下,泡沫铅负极的质量比容量分别增加25.9%,30.0%和48.2%。此外,SEM观察显示,泡沫铅负极表面活性物质为更加细小的晶体颗粒和具有更高的孔率。更多还原

【Abstract】 Spirally valve-regulated lead acid(VRLA)batteries were prepared by using lead foam as the negative current collectors material.The electrochemical behaviors of a lead foam negative electrode in sulfuric acid were studied by means of chronoamperometry, cyclic voltammetry(CV),electrochemical impedance spectrometry(EIS)and charge-discharge tests.The results show that the real surface area of a lead foam negative electrode is larger than that of a lead foil negative electrode,while the overpotential of the lead foam negative electrode is lower.The electrochemical reaction resistance of a lead foam negative electrode is always smaller than that of a lead foil negative electrode under whatever depth of discharge.Compared with those of a lead foil negative electrode,the mass specific capacities of a lead foam negative electrode are 25.9%,30.0 % and 48.2% higher at 10h,5h and 2h discharge rates,respectively.Besides,the observation of SEM shows that the active material on the lead foam negative electrode has smaller crystals and higher porosity.更多还原