| abstract |
An object of the present invention is to provide a secondary battery having good high-temperature cycle characteristics. The present invention is a laminated laminate type secondary battery having an electrode element including an electrode pair in which a positive electrode and a negative electrode are arranged to face each other, an electrolytic solution, and an exterior body containing the electrode element and the electrolytic solution, The negative electrode includes a negative electrode active material containing at least one of a metal (a) capable of being alloyed with lithium and a metal oxide (b) capable of inserting and extracting lithium ions, a negative electrode binder, a negative electrode current collector, And the electrolytic solution contains a non-aqueous solvent and biphenyl, and the content of the biphenyl in the electrolytic solution is 0.5 to 2.5% by mass with respect to the total of the non-aqueous solvent and the biphenyl. The present invention relates to a secondary battery. |