Secondary battery and electronic device

The invention provides a secondary battery which comprises an electrode assembly of a lamination structure, and the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, the outermost layer of pole piece of the electrode assembly is a single-sided positive pole piece; the single-sided positive electrode plate comprises a positive electrode current collector, a first positive electrode material layer and a second positive electrode material layer which are sequentially stacked, the first positive electrode material layer is located between the positive electrode current collector and the second positive electrode material layer, and the second positive electrode material layer is adjacent to the diaphragm; the first positive electrode material layer comprises a first positive electrode active material, a first adhesive and a first conductive agent; based on the mass of the first positive electrode material