Abstract
The effects of doping on NaCrO2 cathode material are investigated in this study. All doped NaCrO2 powders are denoted as NaMe0.1Cr0.9O2 where Me = Al, Co, Ni, or Mn. To understand the mechanism of doping, field emission scanning microscopy (FESM) and energy disperse spectroscopy (EDS) as well as X-ray diffractometer (XRD) are employed to analyze the morphology and composition of the final products. Further, electrical conductivities of doped NaCrO2 powders are studied using electrochemical impedance spectroscopy (EIS). Compared to pristine NaCrO2, NaNi0.1Cr0.9O2 exhibits a high reversible capacity, while Mn doping contributes to good cycle stability. The charge/discharge behaviors from Ni- and Mn-doped NaCrO2 materials provide us a potential method to co-dope NaCrO2 in the future to achieve high specific capacity and long cycle life simultaneously.
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