To validate our calculated capacity for various electrode materials, we have considered five different electrode materials and checked their maximum specific capacity by carrying out first principles calculations using the projector augmented wave (PAW) method as implemented in the Vienna Ab initio Simulation Package. Moreover, the generalized gradient approximation of Perdew-Burke-Ernzerhof (GGA-PBE) has been considered as the exchange correlation potentials and the energy cutoff is set to 470 eV. Furthermore, the dispersion energy corrections have been considered by incorporating DFT-D3 method of Grimme. All of the structures are relaxed until the Hellmann-Feynman force criteria of < 0.01 eV/Å and the total energy convergence criteria of 10 -4 eV.