Abstract
Recently, researches on sodium (Na) batteries get resurrected for large-scale applications under the background of limited lithium (Li) resource. Four layered sodium transition-metal (TM) oxides, NaMO2 (M=V, Cr, Co and Ni) with α-NaFeO2 type as potential cathode materials for sodium batteries, are systematically investigated by first-principles calculations. As two key properties for a successful cathode material, the electrode potential and activation energy (EA) of Na+ in their parent NaMO2 crystals (M=V, Cr, Co and Ni) are reported. Our results suggest that NaCrO2, NaCoO2 and NaNiO2 possess satisfying average electrode potential (AEP) and their potential platforms are close to that of LiCoO2 to a large extent. Meanwhile, EA of these materials are all acceptable for batteries. These first-principles results suggest that layered NaCrO2, NaCoO2 and NaNiO2 are viable candidates for large-scale applications.
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