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제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Crystal structure and ionic conductivity of new NASICON-type compounds

2019년 2월 14일 14시 55분 53초
MAT.P-513 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
Material Chemistry
저자 및
Minseong Kim, Jaegyeom Kim, Seung-Joo Kim*
Department of Energy System Research, Department of Chemistry, Ajou University, Korea
Framework oxides based on sodium (Na) super ionic conductor (NASICON) structure deserves further attention towards tailoring new lithium-ion conductors for application as electrolytes in solid state lithium batteries. In this study, Li11+xMg(2+x)/3Ta(4-x)/3(PO4)3(0≤x≤1) was synthesized by solid state reaction and their crystal structures were characterized by synchrotron powder X-ray diffraction. All the compounds are based on NASICON structure and exhibit two different structures depending on the x value. Li1.0Mg0.66Ta1.33(PO4)3 crystallizes to trigonal structure with space group P-3c1 when x=0, Li2.0MgTa(PO4)3 crystallizes to monoclinic structure with space group Pn when x=1. Through the calculation of the Bond Valence Energy Landscape Map, the lithium ion passage was forward to appear at an activation energy of 1.07 eV for Li1.0Mg0.66Ta1.33 (PO4)3, while the Li2.0MgTa(PO4)3 has an activation energy of 0.90 eV. The cyclic voltammetry results show that the reduction potential is 1.4eV, which is lower than that of other NASICON structure compounds such as LiTi2Al(PO4)3. The ionic conductivity of Li1.1Mg0.7Ta1.3(PO4)3 was confirmed to be the best ionic conductivity 1.18×10-3 S/cm.