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5.1.2 Single cell performance Figure 5.6. – Performance of dPEI-containing positive electrolyte in a VFB cell. a) charge/discharge profiles at 20 mAcm_2 and 13 mLmin_1, b) Efficiencies corresponding to the profiles in a). CE=coulombic efficiency, VE=voltage efficiency, EE=energy efficiency. To ensure the potential application of a dPEI-containing positive electrolyte in large- scale batteries, a comparison with a fresh electrolyte is done in a VFRB single-cell prototype. Figure 5.6a, shows the charge and discharge curves for a constant- current with an operational voltage from 0.8V to 1.7 V at a current density applied of 20 mA/cm2. The dPEI-containing electrolyte demonstrates a longer charging and discharging time than for the fresh electrolyte, leading to a superior battery capacity. For example, the discharge time obtained is increased from 2.24 h to 2.84h for a fresh electrolyte and 0.6% for a dPEI-electrolyte respectively, corresponding to discharge value of 1.12 and 1.42 Ah, which is very close to the theoretical value of 1.34 Ah. Consequently, a maximum discharging capacity is achieved using dPEI-containing electrolyte due to improvements of the 75PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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