The force field parameters in this study, were tuned to capture the secondary pore structures present in CLs. While previous CGMD work has been able to capture the primary pore structure , it is well known that the secondary pores are the source of electrochemical activity in the CL . The novelty of this process lies in the parametrisation of ionomer-ionomer and ionomercarbon interactions since they are typically combined into the carbon-carbon force fields as an "effective-interaction . Hence, the force field parameters in this work had to be chosen in a manner that decouples the carbon-carbon interactions that were previously reported, into carbon-carbon, carbon-ionomer and ionomer-ionmer interactions.