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ZrOCl2·8H2O and ZrO(NO3)2·2H2O were used respectively to synthesize a NASICON solid electrolyte by a sol-gel method. The structure and properties of two samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). The crystal structure was investigated by the Rietveld refinement. It is found that both the samples contain a monoclinic C2/c phase as the main conductive phase with the lattice parameters of a=1.56312 nm, b=0.90784 nm and c=0.92203 nm, though a small amount of rhombohedral phase is also detected in the final product. The sample synthesized by ZrO(NO 3 ) 2 ·2H 2 O contains more monoclinic phase (89.48wt%) than that synthesized by ZrOCl 2 ·8H 2 O (74.91wt%). As expected, the ionic conductivity of the latter is higher than that of the former; however, the activation energy of the latter (0.37 eV) is slightly higher than that of the former (0.35 eV).
The structure and properties of two samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) ), and electrochemical impedance spectroscopy (EIS). The crystal structure was investigated by the Rietveld refinement. It is found that both the samples containing a monoclinic C2 / c phase as the main conductive phase with the lattice parameters of a = 1.56312 nm, b = 0.90784 nm and c = 0.92203 nm, although a small amount of rhombohedral phase is also detected in the final product. The sample synthesized by ZrO (NO 3) 2 · 2H 2 O contains more monoclinic phase (89.48 wt%) than that synthesized by ZrOCl 2 .8H 2 O (74.91 wt%). As expected, the ionic conductivity of the latter is higher than that of the former; however, the activation energy of the latter (0.37 eV) is slightly higher than that of the former (0.35 eV).