Separator, manufacturing method of the same, and electrochemical device having the same

An electrochemical device comprising:

• a cathode, an anode, a separator interposed between the cathode and the anode, and an electrolyte solution, wherein the separator comprises:
• a porous composite having a porous substrate and a first porous coating layer formed on at least one surface of the porous substrate, wherein the first porous coating layer comprises a mixture of inorganic particles and a first binder polymer wherein the inorganic particles are immobilized by the first binder polymer, the first porous coating layer having pores defined by interstitial volumes between the inorganic particles;
• and
• a second porous coating layer formed on a first surface of the porous composite wherein the second porous coating layer comprises a mixture of cathode active material particles, a second binder polymer and a first conductive material;
• and
• a third porous coating layer formed on a second surface of the porous composite wherein the third porous coating layer comprises a mixture of anode active material particles, a third binder polymer and a second conductive material.