Separator, production method for same and electrochemical device equipped with same

Abstract

The present invention relates to a separator, and more particularly, to a planar porous substrate; and formed on at least one surface of the porous substrate is a porous thin-film coating layer comprising a cross-linked polyamide formed by the polymerisation of a multifunctional amine compound having two or more amine groups and a multifunctional acyl halide compound in the form of an aromatic compound having two or more acyl halide groups. This cross-linked polyamide porous thin-film does not affect the degree of porosity of the separator, contributes to improved electrical performance as it has outstanding affinity and wettability with respect to electrolytic solutions, and contributes to preventing thermal contraction of the separator due to outstanding heat resistance and resistance to deformation.

Description

technical field [0001] The present invention relates to a separator for an electrochemical device, a method for producing the same, and an electrochemical device including the separator. Background technique [0002] This application claims priority from Korean Patent Application No. 10-2010-0087091 filed on September 6, 2010, the entire contents of which are incorporated herein by reference. [0003] In addition, this application claims priority from Korean Patent Application No. 10-2011-0090097 filed on September 6, 2011, the entire contents of which are incorporated herein by reference. [0004] Recently, there has been an increasing interest in energy storage technologies. As the field of application of energy storage technology has been extended to mobile phones, camcorders, notebook computers, and even electric vehicles, there have been increasing attempts to research and develop electrochemical devices. In view of the above-mentioned situation, the rechargeable seco...

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Problems solved by technology

Depending on the safety features of the electrochemical device, thermal runaway or perforation of the diaphragm caused by overheating of the electrochemical device increases the risk of explosion

[0007] In particular, polyolefin-based porous films conventionally used as separators for electrochemical devices exhibit severe thermal shrinkage behavior when the electrochemical device undergoes thermal runaway, thereby causing a short circuit between the positive and negative electrodes.

Meanwhile, conventional separators such as polyolefin-based porous membranes have poor wettability to electrolytes, which negatively impacts the performance improvement of electrochemical devices.

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