Abstract: A separator includes a separator substrate, and a first coating and a second coating respectively disposed on two surfaces of the separator substrate, where the first coating includes polymer secondary particles, and the secondary particles have a melting point of 130° C. to 150° C. The first coating in the separator has good adhesion and resistance to electrolyte swelling, and the secondary particles have many internal voids, which facilitates the penetration of the electrolyte, thus improving electrolyte penetration into the first coating and enhancing the low-temperature performance of the electrochemical apparatus.

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.

Abstract: A polymer binder having softening point of 60° C. to 100° C. including a copolymer formed by polymerizing a first monomer, a second monomer, and a third monomer. The first monomer includes at least one of compounds shown in formula (I) or formula (II). The second monomer includes at least one of compounds shown in formula (III) or formula (IV). The third monomer includes at least one of compounds shown in formula (V): R11 is selected from an alkyl group having 0 to 3 carbon atoms; n1 is an integer between 2 and 5; R21 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms, and M is hydrogen or an alkali metal cation; R22 is selected from hydrogen or an alkyl group having 1 to 5 carbon atoms; and R31 is selected from an alkyl group having 1 to 5 carbon atoms.

Abstract: A separator includes a porous substrate and a first coating located on at least one surface of the porous substrate. The first coating includes a first polymer binder and first inorganic particles, and the first polymer binder comprising core-shell structured particles. 0.3×Dv50 of the first polymer binder?Dv50 of the first inorganic particles?0.7×Dv50 of the first polymer binder. Dv50 represents a particle size which reaches 50% of a cumulative volume from a side of small particle size in a granularity distribution on a volume basis The first inorganic particles are used in the first coating, ensuring that the first polymer binder has a bonding function, electrolyte transport is promoted, and the rate performance of the electrochemical device is improved.

Abstract: A separator includes a porous substrate and a hybrid coating layer disposed on a surface of the porous substrate. The hybrid coating layer includes a plurality of polymer particles and a binder. Each polymer particle includes a shell and a cavity defined in the shell. The polymer particle can swell and damage when comes in contact with an electrolyte.

Abstract: A separator and an energy-storing electrochemical device are disclosed, the separator includes a porous substrate and a first coating located on at least one surface of the porous substrate. The first coating includes a first polymer binder and first inorganic particles, and the first polymer binder comprising core-shell structured particles. The first inorganic particles are used in the first coating, ensuring that the first polymer binder has a bonding function, electrolyte transport is promoted, and the rate performance of the electrochemical device is improved.