| http://www.w3.org/ns/prov#value | - The density is measured from the weight when the electrode is in a dry state. [0031] The electrolyte solution of the electric double-layer capacitor in accordance with the present invention is an aprotic solvent solution containing more than 0.5 mol/liter of an electrolyte selected from the group consisting of boric tetrafluoride salts of alkyl quaternary ammonium, phosphate hexafluoride salts, an
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