Supplementary Information
It contains additional DOS and pDOS plots for the defective silicence systems, relaxed configurations of single vacancy and Stone-Wales defective graphene and Li decorated defective graphene structures, relaxed configurations of H2 adsorption onto pristine silicene, Differential charge diagrams of Li decoration on SV silicene and SW silicene, pristine graphene and Li decorated SW graphene along with the average Li binding energy in all the lithium decorated systems.