Electrolytic manganese dioxide for lithium primary battery, and lithium primary battery using the same

Abstract

Electrolytic manganese dioxide for lithium primary batteries has a sodium content of 0.05 to 0.2% by mass, and a pH of 5 to 7 as measured according to JIS-K-1467. Using this electrolytic manganese dioxide as a positive electrode active material for lithium primary batteries enables the batteries to be excellent in both initial discharge characteristics and long-term discharge characteristics.

1 . Electrolytic manganese dioxide for lithium primary batteries, the electrolytic manganese dioxide having a sodium content of 0.05 to 0.25% by mass, and a pH of 5 to 7 as measured according to JIS-K-1467. 
     
     
         2 . The electrolytic manganese dioxide for lithium primary batteries of  claim 1 , wherein the electrolytic manganese dioxide has a sodium content of 0.05 to 0.2% by mass. 
     
     
         3 . A lithium primary battery comprising:
 a positive electrode including the electrolytic manganese dioxide for lithium primary batteries of  claim 1 ;   a negative electrode including one of lithium metal and a lithium alloy; and   a separator and a non-aqueous electrolytic solution between the positive electrode and the negative electrode.   
     
     
         4 . The lithium primary battery of  claim 3 , wherein the electrolytic manganese dioxide has a sodium content of 0.05 to 0.2% by mass.