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Contents German abstract....................................................................................1 Chapter 1 Introduction ................................................................................................ 3 1.1 The need for electric energy storage............................................................................ 3 1.2 Fundamentals ............................................................................................................... 4 1.3 Objectives of the presented work .............................................................................. 11 1.4 Structure of the presented work................................................................................. 11 1.5 The flow factor .......................................................................................................... 12 Chapter 2 Flow battery modeling.............................................................................. 13 2.1 Assumptions and simplifications ............................................................................... 13 2.2 State-of-charge of a Vanadium Redox Flow Battery ................................................ 13 2.3 Concentrations of the ionic species ........................................................................... 15 2.4 Vanadium crossover .................................................................................................. 18 2.5 Shunt currents ............................................................................................................ 26 2.6 Open circuit voltage (OCV) ...................................................................................... 35 2.7 Ohmic overpotential .................................................................................................. 37 2.8 Activation overpotential ............................................................................................ 37 2.9 Overpotential due to deviations between tank OCV and cell EMF .......................... 41 2.10 Concentration overpotential ...................................................................................... 42 2.11 Total cell voltage ....................................................................................................... 48 2.12 Modeling of the hydraulic circuit .............................................................................. 49 Chapter 3 Definitions ................................................................................................ 57 3.1 Signs of current and power ........................................................................................ 57 3.2 Nominal operational parameters................................................................................ 57 3.3 Capacity ..................................................................................................................... 57 3.4 Efficiency definitions ................................................................................................ 58 Chapter 4 V alidation of the stack voltage model ...................................................... 65 4.1 Available experimental data and confidentiality ....................................................... 65 4.2 V alidation methodology ............................................................................................ 66 4.3 Determination of the electrochemical active electrode area...................................... 68 Chapter 5 Model-based cell design ........................................................................... 77 5.1 Current state of science.............................................................................................. 77 5.2 Initial considerations.................................................................................................. 78 VPDF Image | Model-based Design Vanadium Redox Flow Batteries
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