Nonaqueous secondary battery and electronic device

An electronic device comprising a nonaqueous secondary battery,

• wherein the nonaqueous secondary battery includes a positive electrode including a positive electrode mixture layer, a negative electrode and a nonaqueous electrolyte,
• the positive electrode mixture layer contains a lithium-containing complex oxide defined by the general formula (1) and has a density of 3.5 g/cm3 or more, and
• the nonaqueous electrolyte contains a solvent, an electrolyte salt, and a fluorinated nitrile compound including two or more cyano groups in molecules or a cyano group and an ester group in molecules, or triethyl-2-fluoro-2-phosphono-acetate;
• LixM1yM2xM3vO2 (1)
• where, M1 represents at least one transition metal element selected from the group consisting of Co, Ni and Mn, M2 represents at least one metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, M3 represents an element other than Li, M1 and M2, 0.97≦x<1.02, 0.8≦y<1.02, 0.002≦z≦0.05, and 0≦v≦0.05, and
• an amount of the fluorinated nitrile compound added to the nonaqueous electrolyte is 0.005 to 1.0 mass %.