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decay mechanism of the discharge capacity is reversible by remixing the electrolyte solutions or mitigated by engineering controls via a transfer techniques. Figure 6. Discharge capacity as a function of cycling for the single cell at 35°C, 800 cc/min/cell, and 320 and 400 mA/cm2. Methods to further improve the stack energy efficiency will be further examined in FY16 at a current density of 400 mA/cm2. Efforts will focus on improving the ohmic losses (i.e. bipolar plate, membrane) which appears to be the rate limiting step. The operating temperature and higher flow rates will also be examined to further improve the stack energy efficiency. These efforts will be reported in future reports in FY16. FY16 Quarter 2 Project Status Summary The FY16 Q2 milestone was to “complete evaluation of experimental 3-cell stacks with component improvements to improve stack performance at higher current density.” For FY16, the current density target was increased from 320 mA/cm2 to 400 mA/cm2. Operating the stack at progressively higher current densities has been a focus over the past 3-4 years to reduce the stack cost. A higher current density, however, typically will reduce the stack and system energy efficiency. The primary goal of the stack development is to operate at a higher current density to reduce costs while maintaining a high stack energy efficiency. A thinner Nafion membrane was investigated in Q2 as a function of current density (320 mA/cm2 and 400 mA/cm2) and flow rate and compared to the design discussed in Q1. Single cells with active areas of 780 cm2 were fabricated in Q2 with Nafion 211 and 212; the stack energy efficiency was measured as a function of current density and flow rate. As discussed earlier, Nafion 211 is approximately half the thickness of the Nafion 212; Nafion 211 is ~ 1 mil thick and Nafion 212 is ~ 2 mils thick. The charge/discharge voltage curves for both cells at 320 mA/cm2 and 400 mA/cm2 for a flow rate of 1200 cc/min/cell is shown in Figure 7. 10PDF Image | High Current Density Redox Flow Batteries
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