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제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Various Li Stoichiometries Induced by Partial Substitutions of Ti with Ta in the Li2Ti?2(PO4)3 System

2014년 2월 13일 16시 45분 23초
MAT.P-1043 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 16일 (수요일) 16:00~19:00
저자 및
김경호, 윤호섭1,*
아주대학교 에너지시스템학부 응용화학과, Korea
1아주대학교 화학과, Korea
Lithium metal phosphates, Li2±xM2(PO4)3(M=V), have been widely investigated as materials for secondary batteries. It has been reported that the amount of Li can be adjusted in accordance with the oxidation states of metals (M), and Li occupancies are profoundly related to the ionic conductivity. In attempts to control the amount of Li ions by using various metals with different oxidation states, we were able to find new members of this family with non-stoichiometric Li and we report here the synthesis and structural characterization of the mixed-valent compounds, Li2-x(Ti1-xTax)2(PO4)3 (0 ≤ x ≤ 0.1). The framework of the title compounds is the same as that of the previously reported Li2.72Ti2 (PO4)3 phases (Wang & Hwu, 1991) and the framework is built up from corner-sharing TiO6 octahedra and PO4 tetrahedra. The Li+ ions are located on one crystallographic position in the vacancies of the framework. They are surrounded by four O atoms in a distorted tetrahedral coordination. In this study, correlation between Li contents and metal substitution will be discussed. The stoichiometry of Li ions in this space can be adjusted by the sum of the oxidation numbers of each metal. The classical charge valence of the compound should be described as Li2-x([Ti3+]/[Ti4+]1-x[Ta4+]x)2(PO4)3.