Patent ID: 6527941
Filing Date: 2003-03-04
Classification: C01G,C01P,C25B,H01M,Y02E

Abstract:
A method of producing EMD having unexpected high discharge capacity at high discharge rates by electrolysis in an electrolytic cell having cathodic and anodic electrodes disposed therein comprising the steps of:maintaining a heated aqueous electrolyte solution comprising sulfuric acid and manganese sulfate in said electrolytic cell at a temperature in the range of from about 95Â° C. to about 98Â° C., said solution having sulfuric acid therein in an amount in the range of from about 20 to about 60 grams of sulfuric acid per liter of said solution and manganese sulfate therein in an amount whereby manganese ion is present in the range of from about 5 to about 30 grams of manganese ion per liter of solution; maintaining the amounts of said sulfuric acid and said manganese ion in said solution at a ratio of sulfuric acid to manganese ion greater than 2 but less than or equal to 4; and applying electric current to said electrodes whereby said anodic electrode current density is in the range of from about 2.5 to about 6 amperes per square foot and said high discharge capacity EMD produced is deposited on said anodic electrode.