Additional assumptions for the coupled electrochemical-mechanical model correspond to the fact that the contact interface between the electrode and the current collector is fixed. Also, we note that the mechanical analysis of this work mainly focuses on the electrode microstructure changes. This is to say, even if we applied the mechanical properties of Si to a homogenized Si porous phase, the calculated stresses and strains cannot be directly related to the interactions between the Si particles. Thus, we only focus on the effects of the expansion of the Si phase on the displacements of the rest of electrode components. Additionally, interface between CBD and graphite (or Si) is also fixed. Therefore, no explicit detachment of CBD will occur as a result of active material volume expansion, even though high stress regions will be created.