Abstract
The object of this paper is to simulate electrochemical performances of V-electrolyte employed in the VRFB cell when different charge/discharge current densities are given. Experimental results show that increasing charge(or discharge) current for a given discharge (or charge) current leads to the reduction of both voltaic efficiency and charge(or discharge) capacity as compared to the use of same charge/discharge currents, while resulting in coulombic efficiency improvement. In contrast, the decreasing cases provide the improvement of both the voltaic efficiency and the capacity, but there takes place a serious problem of the capacity fading effect as well as the coulombic efficiency reduction. This is because low charge/discharge current densities causes polarization effects and self-discharges during cyclic operation, resulting in electrochemical instability of electrolyte performance. Consequently, both the charge and discharge current densities have to be employed over 80 mA/cm2 to keep an electrochemical stability of electrolyte.
Original language | English |
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Pages (from-to) | 1041-1046 |
Number of pages | 6 |
Journal | Bulletin of the Korean Chemical Society |
Volume | 39 |
Issue number | 9 |
DOIs | |
State | Published - Sep 2018 |
Keywords
- Charge/discharge current characteristics
- Energy storage system
- Redox flow battery
- Vanadium redox flow battery