Abstract
AbstractRecently, layered O′3‐Na3Ni2SbO6 has been investigated as a unique cathode material for Na‐ion batteries due to the good electrochemical performance via O′3‐P′3 phase transitions in the voltage range between 2.0 and 4.0 V vs Na+/Na. However, at present it is not well understood whether transition metal doping of the pristine structure could improve the phase transition kinetics during charge/discharge. In this study, we synthesized Mn‐doped Na3Ni2‐xMnxSbO6 (x=0, 0.25, 0.5) layered oxides and investigated their feasibility as cathode materials for Na‐ion batteries using ex‐situ X‐ray diffraction (XRD) coupled with DFT calculations. The results show that light Mn doping (x=0.25) energetically enhances the O′3‐P′3 phase transition kinetics with smaller unit‐cell‐volume changes. However, the heavily doped (x=0.5) sample suffers from large polarization, which could be attributable to the reduced two‐phase reaction range and a large unit‐cell‐volume change upon sodium extraction.
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