Electrochemical properties of the Li/MnO{sub}2·Bi{sub}2O{sub}3 couple

摘要

Bismuth oxide modified beta manganese dioxide cathode material showed improved performance overβMnO{sub}2 in primary lithium battery cells. An increased operating voltage for the Li/MnO{sub}2·(Bi{sub}2O{sub}3){sub}0.06 electrochemical systemcompared to Li/βMnO{sub}2 was observed. Data also showed that the exchange current density for the Li/MnO{sub}2·(Bi{sub}2O{sub}3) {sub}0.06 electrochemical system was an order of magnitude higher than that of the Li/βMnO{sub}2 system. The chargetransfer coefficient and thermodynamic properties of both systems were found to be similar. These results indicate a lower activation energy as a result of catalytic behavior of Bi{sub}2O{sub}3 in the Li/MnO{sub}2·(Bi{sub}2O{sub}3){sub}0.06 cell reaction.