| abstract |
A non-aqueous solvent containing a compound having high conductivity and low viscosity is provided. In addition, a high-performance power storage device using the non-aqueous solvent is provided. A power storage device having a cation having a 5-membered heteroaromatic ring and an ionic liquid having an anion for the cation, wherein the 5-membered heteroaromatic ring has one or more substituents, and At least one of the substituents is a straight chain of 4 atoms or more, and C, O, Si, N , S, and P. One or more types of power storage devices are included. [Selection figure] None |