ELECTROMOTIVE-FORCE AND DISCHARGE PROPERTIES OF SOLID-STATE CELL PB PBO/PBO2/

It was found that tetragonal PbO has an ionic conductivity, and the so lid state cell using the oxide as an electrolyte has become of interes t in recent years. In this study, the PbO2/Pb interfaces, which were o btained by both pressing and electrolyzing, were heated to produce an electrochemical cell at 333 K. The electromotive force and the impedan ce response of the cell were measured during the heat-treatment. As th ere is a complete continuity of composition at the interface obtained by electrolyzing, a resistant oxide layer readily grows by heating. Th e electromotive force of the cell by electrolyzing rises to about 45% of the theoretical value, while that of the cell by pressing is on a m u V level. An X-ray analysis confirms that the electromotive force of the cell is caused by the resistant oxide, tetragonal PbO formed in th e PbO2/Pb interface. The electromotive force of the cell by electrolys ing decreases rapidly during the initial stage of a constant resistanc e discharge at room temperature, but the degradation is restrained by a rise in working temperature.