The PbO2 agglomerate-of-spheres: investigation of four grid materials

摘要: Abstract During the past decade, agglomerate-of-spheres (AOS) model has been developed to describe behaviour of PbO2 electrode during cycling. In model, formation AOS is described as an electro-metasomatic process that creates so-called ‘electroformative’ force (EFF). This causes enlargement entire volume formed PbO2. electrodes are investigated in a special electrochemical cell integrated into tension testing machine. With this arrangement, positive can be cycled with simultaneous measurement EFF and solid-state resistance (SSR) between grid active material formation, charge discharge. From technological point view, it interest investigate influence alloy on parameters electrode. Investigations have performed pure lead Pb-Sb, Pb-Ca-Sn Pb-Ca-Sn-Ag alloys. A very small amount additive greatly mechanical, corrosive properties. The corrosion depends mainly properties layer (i.e., its electronic, characteristics) rather than itself. components alloys appear EFF, highest values observed for Pb-Sb alloy. exhibits smallest region tested materials. rupture plane after 15 cycles all four materials located close ‘grid’. tensile strength differs markedly different high displayed by demonstrates silver material, although tin content about 35% larger, too. Theoretical consideration given layer. It concluded no significant PbO exists metal material.