Abstract: Embodiments of the present application provides a composite film and a method for the preparation thereof, a battery module, a battery pack, and an electrical device. The method of preparing a composite film includes activating a surface of a polymer film by grafting the polymer film with a polar group on the surface, wherein the polymer film is selected from a polyolefin film or a polyethylene-vinyl acetate film; applying a slurry comprising a modified polymer resin grafted with a polar group to the activated surface of the polymer film to form a slurry coat, wherein the modified polymer resin is selected from a modified polyolefin resin grafted with a polar group or a modified polyethylene-vinyl acetate grafted with a polar group; and heating the slurry coat and the polymer film to transform the slurry coat into a modified polymer resin solid film, thereby obtaining the composite film.

Abstract: The present application discloses an electrode slurry, comprising an electrode active material, a binder composition and a solvent; the binder composition comprises a thermally crosslinked polymer and a thermal crosslinking agent, wherein the thermally crosslinked polymer comprises one or more of an epoxy resin, an acrylic-capped prepolymer and an acrylate-capped prepolymer.

Abstract: A binder composition includes a polymer and ceramic particles, the polymer including structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, and a molar ratio of the first-type monomer, second-type monomer, and third-type monomer being (50 to 58):(40 to 44):(2 to 6); where the first-type monomer is selected from one or more compounds of formula I, the second-type monomer is selected from one or more compounds of formula II, and the third-type monomer is selected from one or more compounds of formula III. The binder improves the porosity of the separator, increases the ionic conductivity, and reduces the internal resistance, thereby enhancing the cycling performance of the secondary battery.

Abstract: The present disclosure relates to a hydrophilic polymer and a method for preparing the same. The hydrophilic polymer is characterized in that it is a copolymer of a conjugated diene, a monoolefin and a hydrophilic monomer represented by Formula I. In the Formula I, X1, X2 and X3 are each independently selected from hydrogen atoms, or a linear or branched alkyl with 1-4 carbon atoms. At least one of R1, R2 and R3 is hydrophilic group; and the others are each independently selected from hydrogen atoms or, an alkyl or alkoxy with 1-4 carbon atoms.

Abstract: The present application provides a binder, a preparation method therefor, a secondary battery, a battery module, a battery pack, and a power consuming device. The binder is a polymer containing structural units as represented by formula I and formula II, wherein R1, R2, R3, R5, R6, and R7 are each independently selected from hydrogen or C1-3 alkyl unsubstituted or substituted by a substituent, R4 is selected from hydrogen, cyano, an aldehyde group, or an ester group, and M is selected from H, Li, Na, K or NH4. The binder of the present application has excellent swelling resistance, and the corresponding secondary batteries have significantly improved cycling performance and power performance.

Abstract: The present application provides a method for preparing a prelithiated positive electrode current collector, the method comprising the following steps: gasifying a lithium source in an evaporation chamber filled with a protective gas; enabling an aluminum foil layer to pass through the evaporation chamber and depositing the metal lithium on a surface of the aluminum foil layer by means of vapor deposition; and transferring the aluminum foil layer deposited with the metal lithium to an annealing chamber filled with a protective gas and performing high-temperature annealing to form a lithium-aluminum alloy layer on the surface of the aluminum foil layer.

Abstract: A binder includes a polymer and ceramic particles modified with silane coupling agent. The polymer contains structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, and a molar ratio of the first-type monomer, the second-type monomer, and the third-type monomer is (50 to 58):(40 to 44):(2 to 6). The first-type monomer is selected from one or more compounds of formula I, the second-type monomer is selected from one or more compounds of formula II, and the third-type monomer is selected from one or more compounds of formula III.

Abstract: This application relates to the field of lithium battery technologies, and in particular, to a binder, a separator, and a lithium-ion battery using such separator, where the binder includes a terpolymer formed by copolymerization of a first monomer unit, a second monomer unit, and a third monomer unit that are specified.

Abstract: A fluorine-free insulating slurry includes a first resin selected from resins with a glass transition temperature of above 80° C. and a liquid absorbency in a standard electrolyte solution below 15%, a second resin selected from resins with a glass transition temperature below ?5° C., an inorganic filler, and an organic solvent.

Abstract: This application provides an insulating slurry and a preparation method thereof, a positive electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus. The insulating slurry may include a resin, an inorganic filler, and an organic solvent, where the resin is selected from polyfluorinated olefin resins prepared in a suspension polymerization method, and the inorganic filler is a two-dimensional inorganic material. In this application, both a coating velocity of the insulating slurry and safety performance of the secondary battery can be improved.