Under a CO2 gas flow, O3-LiFeO2, having a layered structure, transformed to alpha-LiFeO2, and then (beta'-LiFeO2 with increasing temperature. All LiFeO2 phases decomposed to Fe2O3 and Li2CO3 under a CO2 gas flow. Conversely, carbonation and structural phase transformations of LiCoO2 and LiNiO2, also having layered structures, were not observed at low temperatures under a CO2 gas flow. In particular, LiCoO2 was chemically stable and its layered structure was maintained even at 600 degrees C. The carbonation and structural phase transformations of alpha-LiFeO2, having a cubic structure, were suppressed compared with those of O3-LiFeO2. To investigate the effect of cation doping into LiFeO2 on carbonation and structural phase transformations, Na-substituted alpha-LiFeO2, NaxLi1-xFeO2 with x = 0 to 0.15 was synthesized. X-ray diffraction measurements revealed that substitution of Na for Li in LiFeO2 suppressed the particle growth induced by carbonation of LiFeO2 under a CO2 gas flow. (C) 2017 Elsevier B.V. All rights reserved.