| 摘要 |
PURPOSE:To prevent increase of internal resistance during storage of a battery by washing iron sulfide used as a positive active material with a mixed solvent of methylene chloride and fluorohydrocarbon and removing free sulphur. CONSTITUTION:Iron sulfide used as an active material of a positive electrode is immersed in a mixed solvent of methylene chloride and fluorohydrocarbon for 0.5-80hr to remove free sulphur which presents in iron sulfide. This iron sulfide is combined with a negative electrode 7 using lithium as an active material and a separator to form a button type organic electrolyte battery. Formation of Li2S film, caused by reaction of lithium with sulphur ion produced by dissolving of free sulphur in electrolyte, on the surface of the negative lithium is prevented. Thereby, increase of internal resistance during storage is prevented and discharge performance is increased. |
