Temperature-dependent long-term stability of Sr0.6Na0.4SiO2.8 fast ion conductors

Dong Woo Joh; Hong Rim Shin; Jongwoo Kim; Kang Taek Lee

Journal of Industrial and Engineering Chemistry, Vol.71, 387-392, March, 2019

DOI10.1016/j.jiec.2018.11.050 Export Citation

Temperature-dependent long-term stability of Sr0.6Na0.4SiO2.8 fast ion conductors

Dong Woo Joh, Hong Rim Shin, Jongwoo Kim¹, and Kang Taek Lee^†

Department of Energy Science and Engineering, DGIST, Daegu, 42988, Republic of Korea
¹Corporate R&D, LG Chem R&D Campus, Daejeon, 34122, Republic of Korea

E-mail:

In this work, for the first time, we systematically evaluated the temperature-dependent long-term stability of Na-doped SrSiO3 super ionic conductors. The total conductivity of the Sr0.6Na0.4SiO2.8 (40SNS) was monitored in situ by electrochemical impedance spectroscopy. The conductivity of the 40SNS at 700 °C degraded within 1 h due to the crystallization of Na2Si2O5. However, at 450 °C, the initial conductivity of the 40SNS was firmly maintained for 260 h without any observable phase transition. These results demonstrate the existence of a threshold temperature regime that suppresses the crystallization kinetics of the amorphous phase of Na-doped SrSiO3 materials.

Keywords:Sodium doped silicates;Solid electrolytes;Long-term stability;Phase transition;Solid oxide fuel cells

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