Separator, preparation method therefor, and related secondary battery, battery module, battery pack, and power consuming device thereof

A separator, comprising:

• two layers of substrate and a coating formed between the two layers of substrate, wherein the coating contains inorganic particles, and 30 wt % to 70 wt % of the inorganic particles have a surface coated with a coating layer, and 70 wt % to 30 wt % of the inorganic particles have an uncoated surface, based on a total weight of the inorganic particle weight of all the inorganic particle in the coating, wherein the inorganic particles are selected from at least one of SiO2, Si, SiO, SnO2, Fe2O3, NiO, CuO, TiO2, and FePO4, a material forming the coating layer is selected from at least one of polyvinylidene fluoride (PVDF), polydopamine (PDA), polyaniline (PAn), polyimide (PI), and polymethyl methacrylate (PMMA), wherein in the inorganic particles having a surface coated with the coating layer, a mass ratio of the coating layer to the inorganic particle coated with the coating layer is (0.1-2):1.