Sodium/beta''-alumina/phosphorus-sulfur cells utilizing P/S ratios of
0, 0.143, 0.332, and 1.17 at temperatures from 350 to 500 degrees C we
re studied by measurement of the equilibrium cell voltages at open cir
cuit, and the steady-state cell voltages at current densities up to 70
mA/cm(2). States of charge, represented by sodium atom fraction in th
e P-S electrode, ranged from 0 to 0.4. Open-circuit voltages up to 2.6
5 V were measured. Theoretical specific energies up to 825 Wh/kg were
calculated from the open-circuit potential vs. composition data. When
phosphorus was added to the sulfur electrode in the P/S ratio 0.143, t
he cell resistance was two to ten times greater than that with sulfur
alone.