Characterization and Modeling of Electrochemical Energy Conversion Systems by Impedance Techniques
This thesis introduces (i) amendments to basic electrochemical measurement techniques in the time and frequency domain suitable for electrochemical energy conversion systems like fuel cells and batteries, which enable shorter measurement times and improved precision in both measurement and parameter identification, and (ii) a modeling approach that is able to simulate a technically relevant system just by information gained through static and impedance measurements of laboratory size cells.
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A16 cell algorithm anode anode and cathode anode gas applied Batteries behavior C/V curve calculated cathode Cathode Material cell voltage charge chemical corresponding current density deviation dynamic macro-model ECS Transactions electrochemical cell Electrochemical Impedance Spectroscopy Electrochemical Society electrochemical system electrode electrolyte electronic conductivity element equation excitation signal explained in section fit result Fourier transformation frequency range galvanic cells gas channel gas conversion gas flow rate high frequencies impedance model impedance spectrum Ivers-Tiffée J. P. Schmidt Klotz Kramers-Kronig Kramers-Kronig relation large-scale system Leonide LIBs linear Lithium-Ion Battery measured impedance method nonlinear Nyquist plot obtained operating conditions operating parameters operating point operating temperature operating voltage overpotential Oxide Fuel Cells pH2O pH2O(xn polarization processes potentiostat RC circuit Re(Z sample SFEIS shown in figure simulated small-scale system SOEC SOFC SOFC stack Solartron Solid Oxide Fuel spectra test benches thesis tion UOCV values voltage Weber