High discharge EMD and an electrode and alkaline cell incorporating the same

摘要

An alkaline electrochemical cell is disclosed having a positive electrode, a negative electrode, and an electrolyte. The positive electrode comprises electrolytic manganese dioxide having a voltage at pH = 6 of at least about 0.860 volt. The electrolytic manganese dioxide also preferably has less than about 250 ppm and more preferably less than about 150 ppm of potassium impurities by weight. Electrolytic manganese dioxide having these properties exhibits significant synergistic and unexpected improvements in high-rate service, which translates to improved high-rate service life of the electrochemical cell containing the improved electrolytic manganese dioxide in its positive electrode.