With the advancement of materials engineering, materials with composites or pores are being used onsite according to their specific purposes. In particular, electrodes, a key component of batteries, have pores, and simulations must be approached with caution as the material properties can differ depending on the presence of pores and their porosity. The simulation technique of finite element analysis is a highly efficient method for equipment design and optimal process derivation. Recently, the use of materials with pores has increased, and considering materials with pores when designing equipment and deriving optimal processes is essential for improving the consistency of the simulation. In this study, the equivalent mechanical properties were derived using the homogenization method. The representative volume element (RVE) technique was used, and the changes in material properties according to the porosity were confirmed. By simulating conditions from 0% to 70% porosity, the trends of changes in Young’s modulus and Poisson’s ratio were confirmed. Although the material properties decreased with increasing porosity, Young’s modulus changed more steeply, whereas Poisson’s ratio changed more gently. This study concluded that to consider changes in porosity, techniques such as RVE must be used to derive representative material properties for more consistent simulations.