Nonaqueous secondary battery and electronic device

摘要

In the nonaqueous secondary battery of the present invention, a positive electrode mixture layer included in a positive electrode contains a lithium-containing complex oxide defined by the general formula LixM1yM2zM3vO2 (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 has a density of 3.5 g/cm3 or more. A nonaqueous electrolyte contains a fluorinated nitrile compound including two or more cyano groups or a cyano group and an ester group.

主权项

1. A nonaqueous secondary battery comprising a positive electrode including a positive electrode mixture layer, a negative electrode and a nonaqueous electrolyte,
wherein 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;
LixM1yM2zM3vO2  (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 %.