High Sensitive Detection of Impurities in Nonaqueous Electrolyte Solutions by a Rotating Disk Electrode

Abstract

A rotating disk electrode technique was applied to the detection of the known impurities in a nonaqueous electrolyte solution used for electrochemical capacitors. Propylene glycol and fluoride ion, which are both hydrolysis products of the nonaqueous electrolyte solution composed of propylene carbonate solvent and triethylmethylammonium tetrafluoroborate salt, were quantitatively detected by a glassy carbon based rotating disk electrode in the concentration range of 10 to 100 ppm, where normal linear sweep voltammetry cannot be applied.