Patent ID: 7897281
Filing Date: 2011-03-01
Classification: H01G,H01M,Y02E

Abstract:
1. An electric double layer capacitor having an electrolyte and an electrode containing an electrode layer bound onto a current collector; wherein the electrode layer comprises a carbonaceous material and a binder polymer which comprises: 50 to 98% by mole of monomer units (a) derived from a compound represented by the following formula: wherein R 1 to 30% by mole of monomer units (b) derived from acrylonitrile, and 0.1 to 10% by mole of monomer units (c) derived from a multifunctional ethylenically unsaturated carboxylic acid ester; and has a glass transition temperature from −80 to 0° C., wherein the electrolyte includes tetraethylammonium tetrafluoroborate, triethylmonomethylammonium tetrafluoroborate, or tetraethylammonium hexafluorophosphate.