Patent ID: 7754386

Claim:
A rechargeable electrochemical cell comprising: a manganese dioxide cathode, a separator, an anode, and an aqueous alkaline electrolyte, wherein the cathode comprises: (i) a strontium compound consisting of strontium oxide, strontium hydroxide, or hydrates thereof, in an amount of from 4.50 to 16.10% by weight of the cathode, and (ii) a barium compound consisting of hydrates of barium hydroxide present in a non-zero amount of less than 1.0% by weight of the cathode, wherein the cell has an individual discharge capacity after 50 deep discharge-charge cycles, to 1.75 V, of at least 0.100 Ah/gMnO 2 , and wherein the cell has a cumulative discharge capacity after 50 deep discharge-charge cycles, to 1.75 V, of at least 6.17 Ah/gMnO 2 .