| 摘要 |
An electrolyte solution for lithium ion secondary batteries, which contains an organic solvent containing a compound represented by formula (1), an electrolyte and an additive containing metal cations; and a lithium ion secondary battery which is provided with the electrolyte solution for lithium ion secondary batteries, a positive electrode and a negative electrode. In formula (1), each of R1, R2 and R3 independently represents a C1 or C2 alkyl group or a C1 or C2 alkoxyl group; and the metal cations are cations of one or more kinds selected from among K+, Rb+ and Cs+. Examples of the additive include one or more salts selected from the group consisting of KSO3CF3 and KN(SO2CF3)2)2. |
