| abstract |
In particular, an object of the present invention is to provide a non-aqueous electrolyte, a non-aqueous secondary battery, a cell pack, and a hybrid system capable of improving desired battery performance using acetonitrile. The non-aqueous electrolytic solution of the present invention contains acetonitrile, a lithium salt, and a cyclic acid anhydride. The non-aqueous secondary battery of the present invention is a non-aqueous secondary battery comprising a positive electrode having a positive electrode active material layer on one or both surfaces of a current collector, a negative electrode having a negative electrode active material layer on one or both sides of the current collector, and a non-aqueous electrolyte solution. In the above, the non-aqueous electrolyte contains acetonitrile and a lithium salt, and the non-aqueous secondary battery, after a storage test at 85° C. for 4 hours, is calculated by dividing the 5 C discharge capacity by the 1 C discharge capacity. It is characterized in that it is 70% or more. Further, the non-aqueous secondary battery has an ionic conductivity at 0°C of 10 mS/cm or more after a storage test at 85°C for 4 hours. |