POLYMER AND PREPARATION THEREOF, AND ELECTROLYTE FILM AND PREPARATION THEREOF

This application provides a polymer, obtained by polymerizing monomer 1, monomer 2, and monomer 3, where monomer 1 has a structure of formula 1, monomer 2 has a structure of formula 2, and monomer 3 has a structure of formula 3, where R1, R2, R3, R4, R5, Rf, x, A, Q, and E are as defined in the specification. This application further provides a polymer electrolyte film including an interpenetrating network structure formed by the polymer and a carbonate polymer. The polymer electrolyte film provided in this application has excellent mechanical strength, improved ionic conductivity, and ionic mobility, and batteries prepared therefrom exhibit high-voltage resistance and excellent high-voltage cycling performance.