Preparation and characterization of NASICON type Li+ ionic conductors

被引：18

作者：

Rao, Rayavarapu Prasada ^{[1
]}

Maohua, Chen ^{[1
]}

Adams, Stefan ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117576, Singapore

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2012年 / 16卷 / 10期

关键词：

NASICON; Lithium ion conduction; Bond valence; Ion transport; Temperature dependent X-ray; SOLID ELECTROLYTES; CONDUCTIVITY;

D O I：

10.1007/s10008-012-1780-x

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The new scandium/aluminium co-doped NASICON phases Li1 + x Al (y) Sc (x -aEuro parts per thousand y) Ti2 -aEuro parts per thousand x (PO4)(3) (x = 0.3, y = 0,0.1,0.2,0.3) were prepared by mechanical milling followed by annealing of the mixtures at 950 A degrees C. X-ray diffraction of all samples showed the formation of NASICON structure with space group R-3c along with a minor impurity. Rietveld refinement of the X-ray data was performed to identify the structural variation. Doping with Sc3+ caused elongation of a- and c- axes for all the compounds when compared with undoped LiTi2(PO4)(3). The compound Li1.3Sc0.3Ti1.7(PO4)(3) showed a maximum of a = 8.5504(7), c = 20.986(3) at room temperature and exhibited highest coefficient of thermal expansion. The highest ionic conductivity (sigma), 7.28x10(-4) S cm(-1) was observed for Li1.3Sc0.3Ti1.7(PO4)(3), two orders of magnitude higher than for the undoped phase.

引用

页码：3349 / 3354

页数：6

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