  Functoinal polymers can be used as electrolyte and binder materials in
solid-state batteries. This often requires performance targets in terms of both
transport and mechanical properties. In this work, a model ionic conductive
polymer system, i.e., poly(ethylene oxide)-LiTFSI, was used to study the impact
of salt concentrations on mechanical properties, including different types of
elastic moduli and the visoelasticity with both non-equilibrium and equilibrium
molecular dynamics simulations. We found an encouragingly good agreement
between experiments and simulations regarding the Young's modulus, bulk modulus
and viscosity. In addition, we identified an intermediate salt concentration at
which the system shows high ionic conductivity, high Young's modulus and short
elastic restoration time. Therefore, this study laid down the groundwork for
investigating ionic conductive polymer binders with self-healing functionality
from molecular dynamics simulations.
