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

Lizhi HE; Jianling LI; Fei GAO; Xindong WANG; Feng YE; Jun YANG

doi:10.5796/electrochemistry.79.934

Article

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

Lizhi HE, Jianling LI, Fei GAO, Xindong WANG ^†, Feng YE ^†, Jun YANG

Author information

Lizhi HE
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
Jianling LI
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
Fei GAO
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
Xindong WANG ^†
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
Feng YE ^†
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences
Jun YANG
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences
Author contributions

†These authors contributed equally: Xindong WANG, Feng YE

Keywords: EDLC, Ageing, Gas Evolution, Internal Pressure

JOURNAL FREE ACCESS

2011 Volume 79 Issue 12 Pages 934-940

DOI https://doi.org/10.5796/electrochemistry.79.934

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Abstract

The internal pressure of electrochemical double layer capacitors (EDLCs) using 1.0 mol dm⁻³ triethylmethylammonium tetrafluoroborate (TEMABF₄) in acetonitrile at different voltages at 70℃ 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.

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