| abstract |
Disclosed are a separator for a battery, which comprises a gel polymer layer formed on a substrate, the gel polymer layer including a plurality of three-dimensional open pores interconnected with each other, and an electrochemical device comprising the same separator. Also, disclosed is a method for preparing the gel polymer layer including a plurality of three-dimensional open pores interconnected with each other on a substrate, the method comprising the steps of: adding a non-solvent partially to a gel polymer solution containing a gel polymer dissolved in a solvent to allow phase separation of the solution, and applying the phase separated solution onto the substrate; and drying the gel polymer layer. In a variant, the method comprises the steps of: applying a gel polymer solution containing a gel polymer dissolved in a solvent onto a substrate, and dipping the substrate into a non-solvent to cause phase separation; and drying the gel polymer layer. In another variant, the method comprises the steps of: applying a gel polymer solution containing a gel polymer dissolved in a solvent onto substrate; and atomizing steam of a non-solvent to the gel polymer layer while drying the gel polymer layer to cause phase separation. |