Separator for Electrochemical Device, Electrochemical Device Comprising the Same and Manufacturing Method of the Separator

A separator for an electrochemical device, comprising:

• a porous polymer substrate;
• and
• a porous organic/inorganic coating layer formed on at least one surface of the porous polymer substrate and comprising a heat conductive inorganic particle, an inorganic core-organic shell particle and a heat-absorbing organic particles, wherein the particles are bound to one another by a binder polymer, and
• wherein the porous organic/inorganic coating layer has a multilayer structure, and the multilayer structure comprises a first porous organic/inorganic coating layer formed on a surface of the porous substrate and comprising the inorganic core-organic shell particle, and a second porous organic/inorganic coating layer formed on the first porous organic/inorganic coating layer and comprising the heat conductive inorganic particle, the heat-absorbing organic particles and the binder polymer,
• wherein the inorganic core-organic shell particle comprises a core portion and a shell portion surrounding a surface of the core portion, the core portion comprises a metal hydroxide having heat-absorbing property at 150° C. to 400° C., the shell portion comprises a polymer resin, and the polymer resin is a water-insoluble polymer or crosslinked polymer.