Hydroxyl-modified binder and preparation method thereof, and secondary battery

A hydroxyl-modified binder, wherein the hydroxyl-modified binder is a copolymer, and monomers forming the copolymer comprise a first monomer and a second monomer;

• the first monomer comprises at least one of acrylic acid, acrylamide, or acrylonitrile;
• and the second monomer comprises a compound of Formula I:
• wherein X is selected from C, an ester bond, an ether bond, a methyleneoxy group, or an amide bond;
• R1 is selected from H or methyl;
• R2, R3, and R4 each are independently selected from H, methyl, hydroxyl, or hydroxymethyl;
• at least one of R2, R3, or R4 is selected from hydroxyl or hydroxymethyl;
• and n is 0, 1, or 2;
• and
• the first monomer and the second monomer constitute a first monomer unit and a second monomer unit of the copolymer respectively;
• based on a mass of the copolymer, a mass percentage of the first monomer unit is A %, and a mass percentage of the second monomer unit is B %, wherein 5≤A≤60 and 40≤B≤95.