METHOD FOR PURIFYING QUATERNARY AMMONIUM SALT AND QUATERNARY AMMONIUM SALT PREPARED BY THE SAME METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for purifying a quaternary ammonium salt purifiable to high purity in a simple and inexpensive step and to provide the quaternary ammonium salt suitable as an electrolytic solution of a non-aqueous electrolyte for electric double layer capacitors.;SOLUTION: The method for purifying the quaternary ammonium salt comprises a step of dissolving the quaternary ammonium salt {e.g. a compound represented by general formula [1] (wherein, R¹ to R⁴ denote each an alkyl group which may each be the same or different; and A denotes an acid component)} in an organic solvent and then filtering the resultant solution. The quaternary ammonium salt is obtained by the method for purification. The salt in which the acid component A is composed of a tetrafluoroborate, a hexafluorophosphate, a perfluoroalkylsulfonate and a bisperfluoroalkylsulfonylimide is suitable for uses of capacitors.;COPYRIGHT: (C)2006,JPO&NCIPI