THIN LEAD DIOXIDE ELECTRODES FOR HIGH-CURRENT DENSITY APPLICATIONS INSEMI-BIPOLAR BATTERIES

In the present paper, Plante-formed, thin-foil lead dioxide electrodes for applications in a semi-bipolar battery construction have been stu died using impedance measurements, phase characterization and galvanos tatic cycling. The effect of interparticle contact, IR-drop, porosity and mechanical pressure on the cell capacity were investigated in orde r to gain information about capacity-limiting parameters at high curre nt discharges. The results showed that a more porous electrode receive d a capacity loss due to increased IR-drop, which in turn was caused b y a decreased interparticle contact. The interparticle contact was fou nd to be more important than porosity as a capacity-limiting factor. B y exerting an external pressure over the cell, it was possible to incr ease the initial capacity for high current density discharges. (C) 199 8 Elsevier Science S.A. All rights reserved.