METHOD OF MANUFACTURING CHEMICAL MANGANESE DIOXIDE FROM TRIVALENT CATHODE ACTIVE MATERIAL, THE CHEMICAL MANGANESE DIOXIDE MANUFACTURED BY THE METHOD AND SECONDARY BATTERY INCLUDING THE CHEMICAL MANGANESE DIOXIDE

摘要

The invention provides a method for preparing chemical manganese dioxide by using trivalent anode active material. The method includes (a) a first lixiviating process using a mixed liquor of sulfuric acid and reducing agent to lixiviate the trivalent anode active material; (b) a second lixiviating process lixiviating the first lixiviating continuously; and (c) adding Na2S2O8 into the trivalent anode active material to precipitate Mn for preparing the manganese dioxide. According to the invention, the method of preparing chemical manganese dioxide by only selectively precipitating Mn from sulfuric acid reduction leaching liquid is provided.