| 摘要 |
PURPOSE:To prolong the cyclic lifetime and provide a high energy density by including a specific amount of Bi in a negative electrode. CONSTITUTION:A case 1 functioning also as a pos. electrode terminal is formed from a stainless steel plate which is subjected to a punchoff process. A sealing plate 2 working also as a negative electrode terminal is alike obtained by punching off a stainless steel plate, and a negative electrode active substance 3 is attached by pressure to the inner wall of this sealing plate. A positive electrode black mix 6 is encapsulated by caulking the open end of the case 1 inward and squeezing the bore of the sealing plate 2 with gasket 4 interposed. 5wt.% Bi or less is included in the negative electrode active substance 3 consisting of Li. This Bi suppresses generation of dendrite lithium, checks Li reaction with organic electrolyte, and prolongs the cyclic lifetime. |
