Polymer, preparation method, binder, positive pole piece, secondary battery and electric device

The invention provides a polymer, a preparation method, a binder, a positive pole piece, a secondary battery and an electric device. The polymer comprises at least one structural unit derived from a monomer shown in a formula I, R1 and R2 are respectively and independently selected from hydrogen and C1-5 alkyl, and R3 is selected from hydrogen, substituted or unsubstituted C1-12 alkyl, substituted or unsubstituted C6-10 aryl, substituted or unsubstituted C2-6 heterocyclic group and substituted or unsubstituted C3-6 alicyclic group; r4 is selected from-O-or-NH-; x and n are integers. The polymer has a proper glass transition temperature, comprehensively improves the high-temperature storage performance, high-temperature cycle performance, low-temperature storage performance and low-temperature cycle performance of a battery, and widens the use temperature of the battery.