SECONDARY BATTERY AND APPARATUS CONTAINED THE SECONDARY BATTERY

This application discloses a secondary battery (5) and an apparatus containing the secondary batteries. The secondary battery (5) includes a positive electrode plate and a negative electrode plate, the positive electrode plate comprising a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector and comprising a positive active material; the negative electrode plate comprising a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector and comprising a negative electrode active material, wherein the positive active material comprises one or more of lithium-containing phosphates with olivine structure and modified compounds thereof, the negative electrode active material includes artificial graphite and natural graphite, and the negative electrode plate satisfies 0.04≤I/I≤0.22.