Model‐Based Overpotential Deconvolution, Partial Impedance Spectroscopy, and Sensitivity Analysis of a Lithium‐Ion Cell with Blend Cathode

Lithium-ion battery cells are multiscale and multiphysics systems. Design material parameters influence the macroscopically observable cell performance in a complex nonlinear way. Herein, development application of three methodologies for model-based interpretation visualization these influences presented: 1) deconvolution overpotential contributions, including ohmic, concentration, activation overpotentials various components; 2) partial electrochemical impedance spectroscopy, allowing direct origin different features; 3) sensitivity analyses, systematic assessment on capacity, internal resistance, impedance. The methods applied to previously developed validated pseudo-3D model high-power lithium-ion pouch cell. features blend cathode. two components show strong coupling, which can be observed interpreted using results deconvolution, analysis. presented useful tools model-supported research development.