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Understanding of carbon-based supercapacitors ageing mechanisms by electrochemical and analytical methods

Liu, Yinghui and Soucaze-Guillous, Benoît and Taberna, Pierre-Louis and Simon, Patrice Understanding of carbon-based supercapacitors ageing mechanisms by electrochemical and analytical methods. (2017) Journal of Power Sources, 366. 123-130. ISSN 0378-7753

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2017.08.104


In order to shed light on ageing mechanisms of Electrochemical Double Layer Capacitor (EDLC), two kinds of activated carbons are studied in tetraethyl ammonium tetrafluoroborate (Et4NBF4) in acetonitrile. In floating mode, it turns out that two different ageing mechanisms are observed, depending on the activated carbon electrode materials used. On one hand, carbon A exhibits a continuous capacitance and series resistance fall-off; on the other hand, for carbon B, only the series resistance degrades after ageing while the capacitance keeps unchanged. Additional electrochemical characterizations (Electrochemical Impedance Spectroscopy e EIS e and diffusion coefficient calculations) were carried out showing that carbon A's ageing behavior is suspected to be primarily related to the carbon degradation while for carbon B a passivation occurs leading to the formation of a Solid Electrolyte Interphase-Like (SEI-L) film. These hypotheses are supported by TG-IR and Raman spectroscopy analysis. The outcome forms the latter is an increase of carbon defects on carbon A on positive electrode

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Journal of Power Sources website : http://www.sciencedirect.com/science/article/pii/S0378775317311370?via%3Dihub
HAL Id:hal-01687184
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Renault SAS (FRANCE)
Laboratory name:
Deposited On:18 Jan 2018 10:27

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