Performance of Aluminum‐Manganese Dioxide Dry Cells

Abstract

Aluminum‐manganese dioxide dry cells were constructed and discharged to determine voltages, capacities, corrosion rates, pH changes, and internal resistances. Aluminum cells showed promise for moderate to heavy‐duty discharge but had lower capacities than commercial general purpose zinc cells on more intermittent discharge. Anode corrosion during discharge and on open circuit following partial discharge raised cell pH and decreased capacity. The internal resistances of the aluminum cells decreased during initial discharge, indicating dissolution or alteration of the original anode film. Substitution of electrolytic for natural manganese dioxide increased cell capacity, as did certain acid additions to the electrolyte. Use of a high potential anode alloy or addition of lithium chloride to the electrolyte increased cell voltages during initial discharge but did not increase capacity. Amine additions to the electrolyte reduced corrosion but did not increase capacity.