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Issue 6, 2011
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The governing self-discharge processes in activated carbon fabric-based supercapacitors with different organic electrolytes

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Abstract

Electrochemical power devices with a long lifespan, long-term energy retention and great cycle stability are extremely important for periodic energy store/supply, especially for solar energy storage for space equipment and for power electronics in integrated circuits. In this report, we have systematically investigated the effects of the charging current density and temperature over the self-discharge (SDC) process of activated carbon fabric-based (ACF) supercapacitors with 1 M LiPF6/EC–DEC (v/v = 1) and 1 M TEABF4/PC as electrolytes, respectively. The experimental results have shown that a different control mechanism governs the SDC process in each electrolyte system. Significant energy retention (in excess of 70%) was obtained in the ACF–TEABF4 system after 36 h. SDC at room temperature. A dual-mechanism control model is proposed for the first time which describes perfectly the SDC process of the supercapacitor using 1 M TEABF4/PC as the electrolyte over different charge current densities and at different SDC temperatures.

Graphical abstract: The governing self-discharge processes in activated carbon fabric-based supercapacitors with different organic electrolytes

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Publication details

The article was received on 14 Dec 2010, accepted on 15 Mar 2011 and first published on 20 Apr 2011


Article type: Paper
DOI: 10.1039/C0EE00773K
Citation: Energy Environ. Sci., 2011,4, 2152-2159
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    The governing self-discharge processes in activated carbon fabric-based supercapacitors with different organic electrolytes

    Q. Zhang, J. Rong, D. Ma and B. Wei, Energy Environ. Sci., 2011, 4, 2152
    DOI: 10.1039/C0EE00773K

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