| abstract |
(57) [Summary] A battery having high low-temperature discharge performance and suppressing swelling of a battery after being left at high temperature without significantly lowering low-temperature charging efficiency. In a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte, the non-aqueous electrolyte includes ethylene carbonate, at least one of methyl ethyl carbonate or dimethyl carbonate, and a borate ester. Or at least one of the sultone derivatives and an isocyanuric acid derivative, wherein at least one of the borate ester or the sultone derivative is 0.1 to 5 parts by weight based on the weight of the electrolytic solution. % Of the isocyanuric acid derivative in an amount of 0.01 to An electrolytic solution containing 0.5% by weight is provided. |