The rise in electric vehicle etc. have led the increase in productions of lithium ion batteries (LIBs), and will do in the future. Thus, the recovering technology of lithium from used LIBs is essential for the stable supply of lithium because of uneven distribution of lithium resources and producers. In this study, a method for extracting lithium from Ni-Co-Mn ternary cathode material in LIBs through the vaporization of lithium carbonate was proposed based on simple thermodynamic calculation. We investigated the behavior of Li in simulated cathode material under CO2-CO atmosphere at 1673 K, which is above the boiling point of Li2CO3. In addition, the selective recovery of lithium from simulated cathode material was demonstrated. We found out that Li is selectively separated from simulated cathode material and Li2CO3 is directly obtained by our proposed method.