RECHARGEABILITY OF MANGANESE-DIOXIDE ZINC CELL USING ZINC-SULFATE ELECTROLYTE

The charge/discharge of electrolytic gamma-MnO2 (EMD) in sulfate solution rather than chloride was investigated. Discharge potential-time curves at different conditions of current density, charging schemes and solutions were registered. The charge/discharge cycle can be repeated up to the 20th cycle with no significant change in the discharge behaviour. The charge/discharge products are characterized by X-ray diffraction pattern indicating recovery of gamma-MnO2 during charging process. The results are promising and encouraging. They are discussed in the light of recent views.