  Electropolymerization plays a critical role in the electrochemical systems.
In this chapter, we address such role within the context of interplay between
kinetics and energetics. The trains of chin radical reactions leads to the
formation of thin films in electrochemical devices. The structure of so-called
solid electrolyte interphase (SEI) during the initial charge/discharge cycles
of the device of any kind (i.e. rechargeable battery) on the surface of
electrode directly controls the the ultimate stability and longevity. In this
chapter, we study the morphological evolution of SEI, both in terms of
transport and thermodynamics within quantitative and qualitative contexts.
