PURPOSE: To prevent reaction between thionyl chloride and lithium and suppress formation of passive film of lithium chloride during storage to eliminate voltage delay and obtain good discharge performance after long storage by using a lithium electrode covered with polyether sulfone film obtained by dipping lithium a polyether sulfone solution and drying it.
CONSTITUTION: A lithium negative electrode 4 is formed in sucha way that the outer surface of lithium 10 is covered with polyether sulfone 11 by dipping lithium in methylene chloride solution containing 5% polyether sulfone and drying it in a dry box. Formation of a positive film on the surface of the lithium electrode 4 during storage is prevented. This film is formed by thionyl chloride 6 containing 1.5M LiAlCl4, which acts as a positive active mass and an electrolyte. This results in prevention of voltage delay.
HAGIWARA ZENZOU
MIZUTANI MINORU
| JPS5553073A | 1980-04-18 |