Electrochemical intercalation activity of layered NaCrO2 vs. LiCrO2

Abstract Electrochemical activities of layered LiCrO 2 ( R -3 m ) and NaCrO 2 ( R -3 m ) materials were investigated at room temperature in aprotic organic electrolyte solutions. LiCrO 2 and NaCrO 2 , possessing the same polytypism and the same transition metal atom, were inactive and active in 1 mol dm −3 LiClO 4 and NaClO 4 propylene carbonate, respectively. The NaCrO 2 electrode performed the highly reversible capacities of ca. 120 mAh g −1 with satisfactory capacity retention in a Na cell.