Abstract: A separator contains a first monomer and/or a first polymer. The first monomer has a structure shown in Formula (I) or Formula (II), R1 and R2 are each independently selected from H, —CnNR3, or —CnNR4R5, and n is an integer from 0 to 4; NR3 is a 4-7 membered heterocyclic ring, R3 contains 0 to 2 oxygen atoms and/or 0 to 2 nitrogen atoms, and the balance are carbon atoms. There is or there is no grafting group R6 on R3, R6 is —CmOH, and m is an integer from 0 to 2; and R4 and R5 are each independently a C1-C4 aliphatic chain.

Abstract: A battery includes a positive electrode plate, a negative electrode plate, a separator, and a non-aqueous electrolyte solution. The non-aqueous electrolyte solution includes a non-aqueous organic solvent including at least ethyl propionate. The separator includes a substrate, a heat-resistant layer, and an adhesive layer, where the heat-resistant layer is disposed on at least one side of the substrate, and the adhesive layer is disposed on the heat-resistant layer. The adhesive layer includes an adhesive including a copolymer of hexafluoropropylene-vinylidene fluoride. A ratio of a mass percentage of ethyl propionate in the non-aqueous electrolyte solution to a mass percentage of hexafluoropropylene in the copolymer of hexafluoropropylene-vinylidene fluoride ranges from 0.2 to 60. The battery in the present disclosure has both a long cycle life and low expansion.

Abstract: Disclosed is a separator and a battery including the separator. The separator includes a substrate, heat-resistant layers, and an adhesive layer, the heat-resistant layers are disposed on two opposite surfaces of the substrate, and the adhesive layer is disposed on the heat-resistant layer; and an adhesive force between the adhesive layer and negative electrode is A, a peel force between a heat-resistant layer and the substrate is B, and a ratio of A to B is greater than 1. In the present disclosure, heat-resistant layers of a separator are bonded to a surface of negative electrode, so that it is difficult for the positive electrode and the negative electrode to be shorted at a high temperature, thereby improving safety performance of a battery.

Abstract: Disclosed are a separator and a battery including the separator. The separator includes a separator base layer and a ceramic coating disposed on a first surface of the separator base layer. The ceramic coating includes ceramic particles. One or more of a surface and an interior of the ceramic coating have micropores. A porosity of the ceramic coating ranges from 40% to 80%. In the micropores, a volume of pores with apertures greater than 0.1 microns occupies 45%-90% of a total pore volume, and a volume of pores with apertures greater than 1.0 micron occupies 40%-80% of the total pore volume. In the present disclosure, a porosity of the separator is improved, and a rate, a residual liquid volume, low-temperature discharging performance, and cycling performance of the battery are improved. In addition, separator nail penetration strength, self-discharging performance, and safety performance are not affected.

Abstract: A ceramic microsphere, a diaphragm including the ceramic microsphere and a lithium ion battery including the diaphragm, where the present disclosure differs from a diaphragm of a conventional lithium ion battery mainly in that, two kinds of coating microspheres, the conductive microsphere and the ceramic microsphere, respectively, which have high safety performance by heat sensitively blocking lithium ions and heat sensitively conducting electrons, are prepared by using a polymer coating method, and the two kinds of coating microspheres with high safety are applied to the diaphragm of the lithium ion battery, so that the diaphragm of the lithium ion battery has two functions of heat sensitively blocking lithium ions and heat sensitively conducting electrons, which can effectively improve the safety performance of the lithium ion battery.

Abstract: A diaphragm and a high-voltage battery including the diaphragm. A modification layer is coated on a surface of an inorganic ceramic particle, the modification layer can adsorb transition metal ions precipitated from an electrode material, thereby preventing the transition metal ions from forming transition metal precipitates on a surface of a negative electrode and improving safety, rate performance and cycle performance of the battery. At the same time, since the modification layer is coated on the surface of the inorganic ceramic particle, thus it will not have a significant impact on an internal resistance of the battery, and thereby not reducing the rate, low temperature, and cycle performances of the battery.