An object of the present invention is to provide a nonaqueous electrolytic solution and a nonaqueous electrolytic solution secondary battery capable of showing high output characteristics at a low temperature even after the battery is used to some extent, and capable of showing good high-rate properties, and further capable of improving safety of batteries. The nonaqueous electrolytic solution includes a nonaqueous solvent, an electrolyte dissolved in the nonaqueous solvent, (I) a difluoro ionic complex (1) represented by the general formula (1), and (II) at least one compound selected from the group consisting of a specific cyclic phosphazene compound, siloxane compound, aromatic compound, cyclohexene compound, phosphoric acid ester compound, fluorinated linear ether compound, fluorinated cyclic ether compound, and boric acid ester compound, and 95 mol % or more of the difluoro ionic complex (1) is a difluoro ionic complex (1-Cis) in a cis configuration represented by the general formula (1-Cis).
本发明的目的是提供一种非
水电解质溶液和一种非
水电解质溶液二次电池,即使在电池被部分使用后也能在低温下显示高输出特性,并能展现良好的高速率特性,进一步提高电池的安全性。非
水电解质溶液包括非
水溶剂、溶解在非
水溶剂中的电解质,(I)由一般式(1)表示的二
氟离子络合物(1),以及(II)选自特定环
磷腈化合物、
硅氧烷化合物、芳香化合物、
环己烯化合物、
磷酸酯化合物、
氟化线性醚化合物、
氟化环状醚化合物和
硼酸酯化合物组成的至少一种化合物,其中95摩尔%或更多的二
氟离子络合物(1)是由一般式(1-Cis)表示的顺式构型的二
氟离子络合物(1-Cis)。