Negative pole piece for secondary battery, secondary battery and electronic device

The invention relates to the technical field of batteries, in particular to a negative pole piece for a secondary battery, the secondary battery and an electronic device. The negative pole piece comprises a negative current collector, the current collector is coated with a negative composite material comprising porous graphene and a negative main material, and the sheet diameter distribution parameter of the porous graphene, volatile components and the weight ratio of the porous graphene in the negative pole piece meet the following relational expression: 0.02 < = A/(B * D) < = 0.80; the porous graphene is coated on the surface of the negative electrode main material; wherein A represents the weight ratio of the porous graphene, B represents the volatile component of the porous graphene, and D represents the sheet diameter distribution parameter of the porous graphene. According to the present invention, the porous graphene is added to the conductive agent of the negative electrode plate, and the sheet diamet