| 摘要 |
PROBLEM TO BE SOLVED: To improve charge/discharge cycle durability by adopting specific polymer electrolyte. SOLUTION: In an electric double layer capacitor having a positive pole and a negative pole mainly composed of carbon material and electrolyte, the electrolyte is polymer electrolyte wherein copolymer of at least one kind selected from vinylidene fluoride/perfluoro (alkylvinyl ether) copolymer, vinylidene fluoride/trifluorochloroethylene copolymer, vinylindene fluoride/ tetrafluoroethylene copolymer, vinylidene fluoride/hexafluoroacetone copolymer and chlorotrifluoroethylene/vinylene carbonate copolymer is matrix and comprises solution formed of solute consisting of quaternary ammonium salt or quaternary phosphonium salt and solvent which can dissolve the solvent. As for the organic solvent which is added to polymer electrolyte and dissolves quaternary ammonium salt or quaternary phosphonium salt, cabonates and lactones can be used. |
