The master's thesis investigates the influence of mechanical stress on the electrochemical response of lithium-ion batteries by innovatively extending the DFN electrochemical model within the PyBaMM environment with a mechanical model that couples phenomena at both the particle and electrode levels. With this model, we are able to comprehensively address the influence of mechanical stresses on simulated results of electrochemical impedance spectroscopy and incremental capacitance analysis for the first time. The results show that mechanical stress accelerates lithium diffusion in the active material and enhances the kinetics of interfacial reactions at the electrolyte interface, while simultaneously lowering the chemical potential and generating additional overpotentials in the battery cell.
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