M. Matsunaga et al., CURRENT DISTRIBUTION IN A POSITIVE CURRENT COLLECTOR OF A SODIUM-SELENIUM(IV) MOLTEN-SALT BATTERY, Journal of the Electrochemical Society, 141(9), 1994, pp. 2413-2416
The current distribution in the positive current collector of a Na/Se(
IV) battery has been studied by measuring the potentials of selenium r
eactions with inert tungsten microelectrodes. The radial potential dis
tribution on discharge depended on the arrangement of the positive cur
rent collector and the conductivity of the graphite felt. A high react
ion rate near the beta'' -alumina tube observed in a cell with a homog
eneous current collector could be inhibited by a dual-mat design compo
sed of a thin inner felt with high resistivity and bulk felt with high
conductivity. Precipitation of sodium chloride on discharge influence
d the current distribution and the polarization as well as the capacit
y.