Process for producing manganese dioxide.

THE INVENTION IS RELATED TO THE PRODUCTION OF MANGANESE DIOXIDE THROUGH A CHEMICAL PROCESS. THE RESULTING MANGANESE DIOXIDE PRODUCT IS IN THE FORM OF PARTICLES THAT ARE CHARACTERIZED BECAUSE THEY HAVE FILAMENT-TYPE PROTECTIONS THAT PROJECT FROM THEIR SURFACE. PARTICLES OF MANGANESE DIOXIDE WITH SUCH SURFACE CHARACTERISTICS MAY BE PRODUCED BY REACTING MANGANESE SULPHATE WITH SODIUM PEROXODISULPHATE IN AN AQUEOUS SOLUTION. THE PROCESS CAN BE CONTROLLED SO THAT HIGH-DENSITY MANGANESE DIOXIDE IS OBTAINED. THE MANGANESE DIOXIDE FORMED DURING THE PROCESS CAN BE DEPOSITED DIRECTLY ON THE ELECTROLYTIC MANGANESE DIOXIDE (EMD) SURFACE. THE MANGANESE DIOXIDE PRODUCT IS PARTICULARLY SUITABLE FOR USE AS A CATHODIC ACTIVE MATERIAL IN ELECTROCHEMICAL CELLS.