| abstract |
An alkali primary cell excellent in high-rate discharge characteristic and lessnin internal pressure rise due to hydrogen produced in overdischarge. A sealed nickel-zincnprimary cell having a container that contains at least a positive electrode includingna positive electrode active material of a nickel higher oxide, a negative electrodenincluding a negative electrode active material of zinc or its alloy, a separator,nand an electrolyte, characterized in that 3 to 7 mass% of manganese dioxide basednon the nickel higher oxide is added to the positive electrode, and the ratio (negativenelectrode theoretical capacity/positive electrode theoretical capacity)nof the theoretical capacity of the negative electrode to the theoretical capacitynof the positive electrode ranges from 1.2 to 1.0. |