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The internal pressure of electrochemical double layer capacitors (EDLCs) using 1.0 mol dm(-3) triethylmethylammonium tetrafluoroborate (TEMABF(4)) in acetonitrile at different voltages at 70 degrees C was measured and sources of the internal pressure were clarified. The PCLV (precharge at low voltage) method was used to weaken the gas evolution and decrease internal pressure. It was found that the EDLC dealt with the PCLV had lower pressure at high voltage than that which was not. Electrochemical impedance spectroscopy was used to measure the capacitance and resistance of the EDLC after ageing. Elemental composition and morphology of the electrodes were analyzed by FESEM-EDX. The gas products generated at 3.0 V were identified by GC-MS. The reaction mechanisms of gas evolution are discussed.

Pressure Evolution and Analysis of Aged Electrodes at High Temperature in Electrochemical Double Layer Capacitors