Composition for preparing separator, method for preparing separator, and electrochemical device having separator prepared therefrom

摘要

The present invention relates to a composition for preparing a separator for an electrochemical device, a method preparing a separator for an electrochemical device, and an electrochemical device having a separator prepared therefrom, more particularly, a composition for preparing a separator for an electrochemical device, comprising a polyolefin, a first diluent, and a second diluent, wherein an interaction energy between the first diluent and the second diluent is in the range of 2 to 3.5 cal/cm3, a method preparing a separator for an electrochemical device using the composition, and an electrochemical device having a separator prepared therefrom. In accordance with the present invention, the pore size of a polyolefin separator can be suitably controlled into a size desired by a user, and the high-temperature stability and mechanical property of the separator can be remarkably improved, thereby enhancing the life time and stability of an electrochemical device having the same.

主权项

1. A composition for preparing a separator for an electrochemical device, comprising a polyolefin, a first diluent, and a second diluent,
wherein an interaction energy between the first diluent and the second diluent is in the range of 2 to 3.5 cal/cm3.