| abstract |
Porous polymer films; And at least one particle of inorganic particles and organic particles, and a porous coating layer formed on one or both surfaces of the porous polymer film, the porous polymer film including a binder polymer, wherein the porous polymer film has a plurality Wherein the diameter of the fibrils located on one side of the film having the porous coating layer is smaller than the diameter of the fibrils located in the center of the film thickness direction, And an electrochemical device provided thereon. |