Structure and properties of NASICON synthesized by two different zirconium salts

Heng-yao Dang, Xing-min Guo, Yong-ping Huang, and Jiang-qi Rong Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘 要：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）.

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