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Section 1.3 Objectives of the presented work half-cell. Although this process still occurs in the VRFB, it only leads to a certain self- discharge but does not damage or harm the electrolytes. Today, the VRFB is the most mature flow battery technology [15]. Reference [15] provides a very comprehensive presentation about the history of flow batteries and possible redox couples. a) Charging process Positive half-cell Membrane Negative half-cell Electron conduction e− VO2+ + H2O → e− + H+ + H+ + VO2+ Current source V3+ + e− → V2+ Ionic conduction e− Electron conduction e− b) Discharging process Positive half-cell Membrane Negative half-cell VO2+ + H+ + H+ + e− → VO2+ + H2O Ionic 2+ 3+ − conduction V → V + e e− Electric load The presented work targets at increasing the VRFB system efficiency in both design and operation phase. Thereby, the reduction of losses caused by shunt currents, concentration overpotential and pump power demand is the overall goal. This goal is pursued using the following four steps: A multi-physical modeling approach for setting up a lumped-parameter model of a VRFB on a system level. A validation of the model with experimental data from VRFB manufacturers. An extensive holistic study on the impact of cell design on battery performance. An innovative flow rate control strategy. 1.4 Structure of the presented work The presented work is organized as follows. In Chapter 2, a comprehensive multi- physical lumped-parameter model of the VRFB is presented. Each modeling aspect is illustrated with numerical examples to improve the understanding of the fundamental Figure 1-8: Fundamental redox reactions in a VRFB [14] 1.3 Objectives of the presented work 11PDF Image | Model-based Design Vanadium Redox Flow Batteries
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