Enhanced ionic conductivity in Mg-doped NASICON under high temperature and high pressure
Abstract
Mg-doped Na Super Ionic Conductor (NASICON), a promising solid electrolyte material, has attracted extensive attention from the scientific research community due to its relatively high ionic conductivity and good electrochemical stability. However, its conductivity is still lower than that of liquid electrolytes. In this study, the high temperature and high pressure in situ AC impedance spectroscopy was employed to systematically investigate the electrical properties of Mg-doped NASICON, with the chemical formula Na3.2Zr1.9Mg0.1Si2PO12 (Mg–NZSP), under high temperature and pressure. The samples were synthesized by the solid-state reaction method. The experimental results show that at a constant temperature, the grain, grain boundary (GB), and total ionic conductivity of Mg–NZSP increase first, then decrease, and finally tend to be stable with the increase in pressure. Notably, the maximum conductivity is reached at 2.0 GPa. At a constant pressure, the ionic conductivity of Mg–NZSP is positively correlated with temperature. Regarding the study of dielectric properties, it is found that the relaxation time of sodium ions at the grain and GB in the Mg–NZSP prolongs with the increase in temperature, and its variation law follows the Arrhenius relationship. A giant dielectric constant phenomenon related to the space charge polarization of sodium ions was observed in the low frequency region.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (12)
Jie Cui
Shanghai Sci-Tech Inno Center for Infection and Immunity, National Medical Center for Infectious Diseases, Huashan Hospital, Institute of Infection and Health, Fudan University
Jialiang Jiang
Manyu Fu
School of Physics Science & Information Technology, Key Laboratory of Quantum Materials Under Extreme Conditions in Shandong Province, Liaocheng University 1 , Liaocheng 252059,
Huiyuan Guo
Laboratory of Quantum Materials Under Extreme Conditions in Shandong Province, School of Physics Science and Information Technology, Liaocheng University 1 , Liaocheng 252000,
Guangyu Wang
Haiwa Zhang
Laboratory of Quantum Materials Under Extreme Conditions in Shandong Province, School of Physics Science and Information Technology, Liaocheng University 1 , Liaocheng 252000,
Guozhao Zhang
Laboratory of Quantum Materials Under Extreme Conditions in Shandong Province, School of Physics Science and Information Technology, Liaocheng University 1 , Liaocheng 252000,
Yinwei Li
Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering
Xingtao Chen
School of Physics and Materials Science, Nanchang University 3 , Nanchang 330031,
Cailong Liu
Laboratory of Quantum Materials Under Extreme Conditions in Shandong Province, School of Physics Science and Information Technology, Liaocheng University 1 , Liaocheng 252000,
Lan Yu
Qinglin Wang
Laboratory of Quantum Materials Under Extreme Conditions in Shandong Province, School of Physics Science and Information Technology, Liaocheng University 1 , Liaocheng 252000,