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Tubular Vanadium Air Redox‐flow battery

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Tubular Vanadium Air Redox‐flow battery ( tubular-vanadium-air-redox‐flow-battery )

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Study of redox flow battery systems for residential applications 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Cycle no Charge - Negative tank Discharge - Negative tank Charge - Positive tank Discharge - Positive tank Figure 5.5 - State of charge of negative side and positive side electrolytes after VisBlue 6 remixing operation charging (cycles 1, 5, 11 and 17) and discharging steps (cycles 5, 11 and 16) – lines were added for readability. When compared to VisBlue 6 during standard operation, VisBlue 6 operated with continuous remixing of the electrolyte exhibits a much more stable performance with constant state of charge at the end of charging and discharging steps on both tanks. It is demonstrated that this method is not only viable to solve volume imbalance but also for overall performance stability for vanadium redox flow batteries. Furthermore, the average state of charge of the battery was always above 70 % at the end of charging step and below 21 % at the end of discharging step. This state of charge window increase is another good indication that the shunt allows more electrolyte to be used for charge/discharge cycles than during standard operation Such stability and increase of state of charge window is achieved by obtaining a constant mole number of vanadium ions on both tanks (Figure 5.6). In contrast to VisBlue 6 standard operation, the volumetric and molar imbalance caused by crossover through membrane and bipolar plates is compensated and rebalanced with the presence of the tank connection. Chapter 5: Results and discussion 31 State of charge

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