NONAQUEOUS ELECTROLYTE, SODIUM ION SECONDARY BATTERY, CHARGING/DISCHARGING METHOD, AND CHARGING/DISCHARGING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte and a sodium ion secondary battery which are appropriate for low-temperature charge or discharge.SOLUTION: A nonaqueous electrolyte having sodium ion conductivity comprises: a first salt of a sodium ion and a first anion; and a second salt of an organic cation and a second anion. The organic cation includes a 1-methyl-1-propylpyrrolidinium cation Py13; and a 1-ethyl-3-methylimidazolium cation EMI.SELECTED DRAWING: Figure 1