Effect of the Ion Substitution on the Ionic Conductivity of Solid Electrolytes Based on Lithium Titanium Phosphate

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J. Korean Ceram. Soc. > Volume 36(4); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(4): 380.

Lithium Titanium Phosphate 고체 전해질의 이온 치환에 의한 이온 전도도의 변화

강은태, 위홍복¹, 권영진

경상대학교 무기재료공학과
¹삼성전기

Effect of the Ion Substitution on the Ionic Conductivity of Solid Electrolytes Based on Lithium Titanium Phosphate

ABSTRACT

Li1+xTi2-xSixP3-xO12. Li1+2xTi2AlxP3-xO12, and Li1+xTi2-xAlx(PO4)3(0$leq$x$leq$0.5) were synthesized and the structure the density and the ionic conductivity of samples were investigated. The main structure was a LiTi2(PO4)3 (S.G :R-3CH) phase over all systems except for Li1+xTi2AlxP3-xO12 system in the range of x$geq$0.4 which had LiTiPO5(S.G:Pnma) as a main phase. The density and the conductivity of samples increased with x but de-creased by the precipitation of the second phase. Consequently the ionic conductivity of these system could be enhanced by the increment of the density restraining from precipitating the second phases. The highest. ionic conductivity of 1.29${times}$10-3 Scm-1 at 25$^{circ}C$ was obtained in Li1.3Ti2Si0.3P2.7O12

Key words: Solid electrolytes, ithium Titanium Phosphate, Ionic conductivity