-This work aims to verify the possibility of using depleted batteries as a source of manganese dioxide applying the electrolytic process. An electrolyte solution containing the following metal ions was used: Ca (270 mgL -1 ), Ni (3.000 mgL -1 ), Co (630 mgL -1 ), Mn (115.3 mgL -1 ), Ti (400 mgL -1 ) and Pb (20 mgL -1 ). The production of electrolytic manganese dioxide (EMD) was performed through electrolysis at 98 °C (± 2 °C) applying different current densities (ranging from 0.61 A.dm -2 to 2.51 A.dm -2 ). The materials obtained were analyzed through X-ray fluorescence spectrometry, X-ray diffraction, specific surface area (BET) and scanning electron microscopy (SEM). The best results regarding the current efficiency, purity grade and specific surface area were obtained with a current density ranging between 1.02 A.dm -2 and 1.39 A.dm -2 . The allotropic ε-MnO 2 variety was found in all tests.
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