| abstract |
The present invention is a porous polymer substrate; It is formed on at least one surface of the porous polymer substrate, a porous coating layer comprising a plurality of microcapsules, and a binder polymer located on part or all of the surface of the microcapsules to connect and fix between the microcapsules; The microcapsule comprises a metal hydroxide particle, and a capsule film surrounding the surface of the metal hydroxide particle, and provides a separator for an electrochemical device, an electrochemical device including the same, and the microcapsule. The present invention has excellent flame retardancy due to the above-described structural features, it is possible to reduce the battery performance degradation due to the water adsorption capacity of the metal hydroxide particles. |