A variety of factors including solution‐phase modification, aluminum composition, temperature, and anolyte volume, modify anodic behavior in the approach to the low current density domain of the aluminum/sulfur battery. A relatively low level [0.4% by weight in the anolyte] of mercury provides an amalgram film on the aluminum anode which minimizes the parasitic chemical consumption of aluminum anode which aluminum, providing anodic faradaic efficiencies in excess of 80%. Anodic overpotential losses are high for aluminum immersed in mercury‐containing electrolytes. However, at lower current densities, their absolute magnitude is several hundred millivolts or smaller and does not substantially impair the cell potential. Aluminum/sulfur battery discharge times up to several hundred hours are demonstrated for 0.2 mA/cm 2 current density cells.
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Licht et al. (1997) studied this question.
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