期刊
JOURNAL OF THE KOREAN ELECTROCHEMICAL SOCIETY
卷 25, 期 4, 页码 191-200出版社
KOREAN ELECTROCHEMICAL SOC
DOI: 10.5229/JKES.2022.25.4.191
关键词
Na-beta ''-alumina; Solid electrolyte; Vapor phase conversion; Lithia addition; Sodium-beta alumina batteries
资金
- National Research Foundation of Korea (NRF) - Ministry of Education through the Basic Science Research Program [NRF-2020R1A6A1A03038697]
- Korea Institute for Advancement of Technology (KIAT) - Ministry of Trade, Industry and Energy (MOTIE) through the International Cooperative RD Program [P0018443]
- Korea Evaluation Institute of Industrial Technology (KEIT) [P0018443] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigates the effect of lithia addition in the beta ''-Al2O3 phase on the grain size and ionic conductivity of Na-beta ''-Al2O3/YSZ solid electrolytes in order to enhance the conductivity of the electrolyte.
Na-beta ''-Al2O3 has been widely employed as a solid electrolyte for high-temperature sodium (Na) beta-alumina batteries (NBBs) thanks to its superb thermal stability and high ionic conductivity. Recently, a vapor phase conversion (VPC) method has been newly introduced to fabricate thin Na-beta ''-Al2O3 electrolytes by converting alpha-Al2O3 into beta ''-Al2O3 in alpha-Al2O3/yttriastabilized zirconia (YSZ) composites under Na+ and O-2(-) dual percolation environments. One of the main challenges that need to be figured out is lowered conductivity due to the large volume fraction of the non-NaT-conducting YSZ. In this study, the effect of lithia addition in the beta ''-Al2O3 phase on the grain size and ionic conductivity of Na-beta ''-Al2O3/YSZ solid electrolytes have been investigated in order to enhance the conductivity of the electrolyte. The amount of pre-added lithia (Li2O) precursor as a phase stabilizer was varied at 0, 1, 2, 3, and 4 mol% against that of Al2O3. It turns out that ionic conductivity increases even with 1 mol% lithia addition and reaches 67 mS cm(-1) at 350 degrees C of its maximum with 3 mol%, which is two times higher than that of the undoped composite.
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