Battery nanofiber barrier film and preparation method thereof

The invention discloses a battery nanofiber barrier membrane and a preparation method thereof, the battery nanofiber barrier membrane is prepared by mixing a functional filler and a polyamide acid solution and performing electrostatic spinning, the interior of the functional filler is of a porous structure, and the surface of the functional filler contains a porous cellulose structure, so that the absorption of the barrier membrane to an electrolyte can be improved; the formed multi-layer coated core-shell structure can increase the mechanical property of the barrier film, the imide chain segment contains an organic silicon chain segment and a benzene ring structure, and the functional filler is cross-linked, so that the diaphragm cannot be softened and shrunk under the condition that the temperature of the battery is increased, the safety of the battery diaphragm is ensured, and the service life of the battery diaphragm is prolonged. The functional filler can support the barrier film, shrinkage of the barrie