| 摘要 |
PURPOSE: To obtain electrolyte which is high in relative conductivity and thermal stability and possessed of solute that is hardly separated out at low temperatures by a method wherein a specific amount of 1,3-dimethyl-2-imidazolidinone is added to electrolyte. CONSTITUTION: Electrolyte comprises carboxylates of diazabicycloalkenes represented by a formula (where m denotes an integer of 2 to 11, n is an integer of 2 to 6, and each ring may be possessed of a lower alkyl substituting group) as solute andγ-butyrolactone as main solvent. 1 to 25% or so by weight of 1,3-dimethyl-2-imidazolidinone is added to the above electrolyte. The molar ratio of diazabicycloalkene to carboxylic acid is set to 1:0.5 to 1:1.2. By this setup, electrolyte is high in solubility even at low temperatures, relative conductivity, and thermal stability.
|
