Core-shell polymer, water-based primer slurry, secondary battery and electrical apparatus

A water-based primer slurry, comprising:

• a binder;
• a conductive agent;
• and
• a water-based medium;
• wherein the binder comprises a core-shell polymer comprising a core portion and a shell portion at least partially covering the core portion, the core portion comprising a structural unit derived from a monomer represented by Formula I, the shell portion comprising a structural unit derived from a monomer represented by Formula I, a structural unit derived from a monomer represented by Formula II, and a structural unit derived from a monomer represented by Formula III,
• wherein, R1, R2 and R3 are each independently selected from hydrogen, fluorine, chlorine or C1-3 alkyl containing at least one fluorine atom, R4, R5, R6, R7, R8, R9 are each independently selected from hydrogen, substituted or unsubstituted C1-5 alkyl, and Ar is substituted or unsubstituted aryl.