Abstract: An electrolyte additive comprising a compound represented by Formula 1 below forms a coating film on an electrode surface in the activation of a secondary battery, thereby the generation of a large amount of gas under a high temperature condition can be prevented, and a cell OCV drop and a decrease in capacity retention rate, which are caused by elution of metal ions from an electrode, can be effectively prevented, resulting in effective improvement in durability, performance and high-temperature safety of the battery, wherein R1, R2, and M are described herein.

Abstract: When shape-variable members are in an operating mode in which power is supplied to them, close-contact lips rotate in a counterclockwise direction, and an area of an opening widens. Accordingly, the close-contact lips do not contact the inner and outer surfaces of a door glass moving upwardly by the operation of a door glass switch. When the shape-variable members are in a non-operating mode in which the power supply to them is shut off, the close-contact lips rotate in a clockwise direction and closely contact the inner and outer surfaces of the door glass.