| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for purifying a quaternary ammonium tetrafluoroborate in a high purity and to obtain an electric double layer capacitor using the electrolyte. SOLUTION: (1) The method for purifying a quaternary ammonium tetrafluoroborate comprises recrystallizing a quaternary ammonium tetrafluoroborate having a backbone represented by general formula (1) (R<SB>1</SB>-R<SB>4</SB>are each independently a 1-6C hydrocarbon group, a 5-10 alicyclic hydrocarbon group or a 6-12C aryl group) with an organic solvent containing a carbonyl compound. (2) The electric double layer capacitor comprises the quaternary ammonium tetrafluoroborate represented in (1) as an electrolyte. COPYRIGHT: (C)2007,JPO&INPIT
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