Abstract: A separator includes a porous substrate and a porous coating. The porous coating is disposed on at least one surface of the porous substrate. The porous coating includes inorganic particles and a binder. The binder includes a first binder. The first binder includes a metal element. The separator of this application is excellent in thermal safety stability and mechanical stability, mainly manifested in that, when a rupture hole is generated on the separator by thermally puncturing the separator by using a round needle with a diameter of R heated to 500° C., a maximum value of a distance between any two points on an edge of the rupture hole is r in a case that the two points are connected to form a line and the distance between the two points is calculated, satisfying: 400 ?m?R?1000 ?m, and 0.9?r/R?5.

Abstract: A separator includes a porous substrate and a porous coating. The porous coating is disposed on at least one surface of the porous substrate. The porous coating includes inorganic particles and a binder. The separator of this application exhibits excellent thermal safety stability and mechanical stability, mainly manifested in that the Modulus of the separator at temperature T is P, satisfying: 100° C.?T?180° C., and 108 Pa?P?109 Pa.

Abstract: A separator includes a substrate and a ceramic coating layer disposed on at least one surface of the substrate. The ceramic coating layer includes a first filler, a second filler, and a binder. A mass ratio between the first filler, the second filler, and the binder is (88.5 to 99):(0.5 to 10):(0.5 to 1.5). An ionic impedance of the ceramic coating layer is 0.001 ? to 0.15 ?. The separator based on the above settings exhibits a relatively low ionic impedance, indicating that the kinetic performance of the separator is improved. The separator as applied in an electrochemical device improves the kinetic performance of the electrochemical device.

Abstract: A separator includes a substrate and a first coating layer disposed on at least one surface of the substrate. The first coating layer includes a first polymer. Based on a total mass of the first coating layer, a mass percent x of the first polymer is 60 wt % to 90 wt %. A softening point of the first polymer is 90° C. to 150° C. The separator of this application possesses excellent interfacial bonding strength, and improves kinetic performance of a lithium-ion battery, and especially cycle performance of the battery under a low-temperature condition.