The Influence of Electroless Silver Deposition on Electrochemical Properties of the Steel Cathode Current Collector of Alkaline Batteries

作者：Ghaemi M^*; Makhlooghi F; Adelkhani H; Aghazadeh M; Shiri H M

来源：International Journal of Electrochemical Science, 2010, 5(1): 131-146.

• current collector
• rechargeable MnO(2)-zinc batteries
• electroless silver

The influence of electroless silver layer on the electrochemical behavior of steel cathode current collector was examined in rechargeable alkaline MnO(2)-Zn batteries. For that purpose, batteries were dismantled after various stages of charge/discharge cycles, followed by polarization measurements and morphological analysis of their steel collectors. The current collectors of spent batteries were used for construction of a new series of batteries. Results indicate that the formation of passive surface film on the steel current collector impairs the charge/discharge cycle performance of batteries. To overcome the difficulties, electroless silver coating on steel collector was proposed. SEM analysis has shown that, the surface defects density and accumulation of corrosion products on steel collector is higher than that of Ag coated collector. Furthermore, the second cycle discharge capacity and the rate of capacity fading of batteries with silver coated collectors were lower in comparison with batteries based on steel collector. Results of electrochemical impedance spectroscopy (EIS) have confirmed that the polarization resistance of steel current collectors is higher than that of the corresponding silver coated collectors.

• 出版日期2010-1