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Chapter 3 CELL PERFORMANCE After preparing the electrolytes, the cell was repeatedly discharged under vary- ing configurations to determine the performance impacts of state of charge, flow rate, electrode compression, and membrane thickness. Flow batteries are very similar to fuel cells and experience the same types of losses (activation, ohmic, and mass transport losses). Therefore, performance was characterized in terms of cell polarization and power density. Unless explicitly stated otherwise, each configuration uses the default parameters specified in Table 3.1. Table 3.1: Default cell configuration. Flow rate (mL/min) Electrode compression membrane & thickness 15 26% NR 212 (50.8 μm) 3.1 Charging Efficiency To prepare the electrolytes, 40 mL of V(IV) was placed into each reservoir. The cell was charged according to the procedure outlined in section 2.4 and initial charging was considered complete when the current plateaued at approximately 100 mA under a terminal voltage of 1.7 V. By integrating current vs time and assuming that all of the vanadium ions in the solutions had undergone a change in charge by the time steady- state was reached, the charging efficiency was determined to be 95%. The charging current vs time is shown in Figure 3.1. The unexpected, initial increase in current may be due to an uneven flow distribution inside the cell. It may have taken several 12PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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