Patent ID: 6361899
Filing Date: 2002-03-26
Classification: H01M,Y02E

Abstract:
A rechargeable electrochemical cell comprising a manganese dioxide cathode, a separator, an anode and an aqueous alkaline electrolyte, said cathode including additives for increasing the cumulative discharge capacity of the rechargeable cell over the cycle life of the cell, wherein said additives comprise:a) a first additive selected from the group consisting of barium and strontium compounds; and, b) a second additive selected from the group consisting of titanium, lanthanum, cerium, yttrium, zinc, calcium, tin and magnesium compounds, wherein the cumulative discharge capacity of the cell is at least 10% over the cumulative discharge capacity with either additive alone and said second additive is present in an amount of from about 0.1% to about 5% by weight of the cathode.