Polyester base film, preparation method therefor and application thereof, pole piece, and lithium battery cell

Abstract

Provided are a polyester base film, a preparation method therefor and an application thereof, a pole piece, and a lithium battery cell. The material of the polyester base film comprises a polyester derivative, the polyester derivative being a derivative obtained by partially replacing original diol monomers in the corresponding polyester with diol monomers containing polar groups, the polar groups comprising one or more selected from amide groups and amine groups. The polyester derivative is used as the material to prepare the polyester base film, increasing the polar group content of the polyester base film, and improving the surface tension of the polyester base film. In addition, the surface tension of the polyester base film can be stable for a long time, effectively promoting the strong integration of the polyester base film and a surface metal layer.

Dependencies are inferred from the claim text.