SEPARATOR AND ELECTROCHEMICAL DEVICE CONTAINING THE SAME

A separator and an electrochemical device including the same. The separator includes an adhesive layer including first adhesive resin particles having an average particle diameter corresponding to 0.8-3 times of an average particle diameter of the inorganic particles and second adhesive resin particles having an average particle diameter corresponding to 0.2-0.6 times of the average particle diameter of the inorganic particles, wherein the first adhesive resin particles are present in an amount of 30-90 wt % based on a total weight of the first adhesive resin particles and the second adhesive resin particles. The separator shows improved adhesion to an electrode and provides an electrochemical device with decreased increment in resistance after lamination with an electrode.