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Self-Discharge Characterization and Modeling of Electrochemical Capacitor Used for Power Electronics Applications

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4 Author(s)
Diab, Y. ; Univ. of Damascus, Damascus ; Venet, P. ; Gualous, H. ; Rojat, G.

The self-discharge of an electrochemical capacitor, also referred to as a supercapacitor, is an important factor in determining the duration of maintaining stored energy, especially in low-duty-cycle applications. The study of self-discharge is conducted as follows: first, the self-discharge is characterized by measuring the decline of open-circuit voltage of the electrochemical capacitor. Second, the mechanisms of self-discharge, leakage current, and diffusion of ions at the electrode-electrolyte interfaces are modeled by an electrical equivalent circuit. The equivalent circuit elements are experimentally determined according to the self-discharge time behavior. In addition, the dependence of the self-discharge parameters on both temperature and initial voltage across the electrochemical capacitor is described in detail.

Published in:

Power Electronics, IEEE Transactions on  (Volume:24 ,  Issue: 2 )

Date of Publication:

Feb. 2009

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