NON-AQUEOUS ELECTROLYTIC SOLUTION AND NON-AQUEOUS ELECTROLYTIC SOLUTION SECONDARY CELL USING THE SAME

The object of the present invention is to provide a non-aqueous electrolyte solution for secondary batteries, capable of securing safety of the battery in an overcharged state without affecting adversely to battery characteristics such as a low-temperature characteristics and storing characteristics. [0002] The present invention relates to a non-aqueous electrolyte solution containing an organic solvent, and a lithium salt as an electrolyte, useful for a secondary battery equipped with a negative electrode and a positive electrode both capable of storing and releasing lithium, which is characterized in that the non-aqueous electrolyte solution contains partially hydrogenated terphenyl and the partially hydrogenated terphenyl has a solubility of not less than 0.5 wt% in the electrolyte solution at room temperature.