Zinc - Manganese Dioxide - Nickel Hydroxide Secondary Electrochemical Generator

The invention relates to a zinc-manganese dioxide secondary electrochemical generator which has the particular feature that it comprises: a) a positive hybrid electrode containing a mixture of manganese dioxide (MnO2) and nickel hydroxide (Ni(OH)2), the mass of Ni(OH)2 being greater than 5% of the sum of the masses of Ni(OH)2 and MnO2, and b) an electrolyte which is an alkaline aqueous solution, the molarity of which is between 4 M and 15 M of hydroxyl anions.