Accumulator equipped with cathodes of manganese dioxide or lead dioxide

Claim 1

An accumulator which can be alternately charged and discharged comprising: a. a cathode, said cathode being a first-kind electrode mounted on a base material, said electrode having either lead dioxide or manganese dioxide as its active material and wherein said first kind electrode, all the active material passes into solution on discharge; b. an anode selected from the group consisting of cadmium, iron (in diaphragm cells), zinc, manganese and lead; and c. an aqueous electrolyte, said electrolyte comprising an acid selected from the group consisting of sulfuric acid, tetrafluoroboric acid, hexafluorosilicic acid, perchloric acid, hydrochloric acid and mixtures thereof which form either soluble manganese or soluble lead salts with the proviso that when said active material in the cathode is lead dioxide or said anode is lead, sulfuric acid and hydrochloric acid cannot be used as electrolyte acids, said electrolyte further comprising an effective amount of onium salts to improve the electrochemical behavior of the, active materials of the accumulator, said onium salts being selected from the group consisting of ammonium, sulfonium, phosphonium and arsonium salts.