The literature consistently reveals that the applied current does not uniformly distribute among all particles in the electrode; rather, a subset known as active particles carries the bulk of the current while others remain unaffected in terms of (de)lithiation . Moreover, the active particle fraction has been established to be proportionate to the applied rate . This phenomenon stems from the size-dependent energy barrier for the nucleation of the (de)lithiated phase, favoring the reaction in nucleated particles . Consequently, the reaction dynamics exhibit rate-dependent behavior, ranging from particle-by-particle lithiation at low rates to collective lithiation at high rates, where the majority of particles are active to sustain the applied current. This dynamic system finds a consistent mathematical description within the regular solution theory framework , coupled with phase-field modeling, providing a realistic and predictive depiction of the complex dynamics.