Intercalated compounds of Li_xBC₃ with different lithium concentration were investigated in this work for possible use of such materials as ionic conductors. Thermodynamic stability of each structure and different modes of lithium migration between layers of graphite-like BC₃ were estimated. It was shown that intercalated compounds of Li_xBC₃, where lithium mass fraction is 0.0903-0.2295, are more stable than compounds of Li_xC with lithium mass fraction of 0.0886-0.2258. According to the calculations’ results, processes of lithium migration between layers of ВС₃ and Li_xBC₃ got relatively low energetic barriers that allow us to talk about possible use of investigated material as ionic conductor.