| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric double layer capacitor in which there is little reduction of discharge capacity even if charge/discharge are repeated at high voltage, and which is superior in a capacity maintenance ratio. SOLUTION: Supporting salt comprises at least one type selected from a group formed of tetraethylammonium-hexa-fluoro phosphate ((C<SB>2</SB>H<SB>5</SB>)<SB>4</SB>N-PF<SB>6</SB>), tetraethylammonium-bis (trifluoromethane sulfonyl) imide ((C<SB>2</SB>H<SB>5</SB>)<SB>4</SB>N-N(CF<SB>3</SB>SO<SB>2</SB>)<SB>2</SB>), triethylmethyl ammonium-bis (trifluoromethane sulfonyl) imide (CH<SB>3</SB>(C<SB>2</SB>H<SB>5</SB>)<SB>3</SB>N-N(CF<SB>3</SB>SO<SB>2</SB>)<SB>2</SB>), and spiro-(1,1')-bipyrlysinium-tetrafluoro borate (SPB-BF<SB>4</SB>). Organic solvent comprises propylene carbonate (PC). COPYRIGHT: (C)2007,JPO&INPIT
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