INFLUENCE OF THE DISSOLVED MN SPECIES INT O THE ELECTROLYTE FROM THE POSITIVE ELECTRODE ON STORAGE CHARACTERISTICS OF PRIMARY LI MNO2 BATTERY/

Mn species, deposited on negative electrodes, caused the increase in t he internal resistance of primary Li/MnO2 batteries during storage. Th e batteries after pre-discharged shored less increase in internal resi stance. On the other hand, among the batteries without pre-discharge, ones that exhibited a higher open circuit voltage showed a larger incr ease in internal resistance. As to these batteries, the positive elect rodes were composed of MnO(2)s heat-treated at a lower temperature and dried at a higher temperature before assembling. Large amounts of Mn species deposited on the surface of the negative electrode during stor age.