Coin-shaped lithium secondary battery and IoT device
摘要
說明書
The electrolytic solution 22 may further contain vinylene carbonate (VC) and/or fluoroethylene carbonate (FEC) and/or vinyl ethylene carbonate (VEC) as additives. Both VC and FEC have excellent heat resistance. Accordingly, a SEI film having excellent heat resistance can be formed on the surface of the negative electrode plate 16 by the electrolytic solution 22 containing such additives.
The exterior body 24 includes a closed space, and the closed space accommodates the positive electrode plate 12, the negative electrode plate 16, the separator 20, and the electrolytic solution 22. A structure generally employed for coin-shaped batteries (for example, see Patent Literature 1) may be employed as the exterior body 24, and there is no specific limitation. Typically, the exterior body 24 includes a positive electrode can 24a, a negative electrode can 24b, and a gasket 24c, and the positive electrode can 24a and the negative electrode can 24b are crimped via the gasket 24c to form the closed space. The positive electrode can 24a and the negative electrode can 24b can be made of metals such as stainless steel and are not specifically limited. The gasket 24c can be an annular member made of an insulating resin such as polypropylene or polytetrafluoroethylene and is not specifically limited.
