Ionic conduction of lithium for perovskite type compounds, (Li0.05La0.317)1-xSr0.5xNbO3, (Li0.1La0.3)1-xSr0.5xNbO3 and (Li0.25La0.25)1-xM0.5xNbO3 (M=Ca and Sr)
Ionic conduction of lithium for perovskite type compounds, (Li0.05La0.317)1-xSr0.5xNbO3, (Li0.1La0.3)1-xSr0.5xNbO3 and (Li0.25La0.25)1-xM0.5xNbO3 (M=Ca and Sr)
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DOI：
10.1016/s0167-2738(98)00131-3
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发表时间：
1998-07-01
影响因子：
3.2
通讯作者：
Wakihara, M
中科院分区：
文献类型：
--
作者：
Kawakami, Y;Fukuda, M;Wakihara, M
为了提高(Li,La)NbO3钙钛矿体系中锂因晶格膨胀而产生的离子电导率，我们尝试制备了三种钙钛矿化合物(Li0.05La0.317)(1-x)Sr0.5xNbO3、(Li0.1La0.3)(1-x)Sr0.5xNbO3和(Li0.25La0.25)(1-x)Sr0.5xNbO3，分别用较大的 Sr2+ 离子替换 Li0.05La0.317NbO3（斜方晶系）、Li0.1La0.3NbO3（四方晶系）和 Li0.25La0.25NbO3（立方晶系）中较小的 Lif 离子和 La3+ 离子。此外，通过用较小的Ca2+离子代替较大的La3+离子制备了钙钛矿化合物(Li0.25La0.25)(1-x)Ca0.5xNbO3以进行比较。由于电池体积的增加，所有 Sr2+ 掺杂钙钛矿化合物的锂离子电导率均得到增强。特别是,与其他钙钛矿((Li0.05La0.317)(1-x)Sr0.5xNbO3和(Li0.05La0.317)(1-x)Sr0.5xNbO3和(Li0.1La0.3)(1-x)Sr0.5xNbO3)相反，(Li0.25La0.25)(1-x)Ca0.5xNbO3钙钛矿化合物的离子电导率由于晶胞体积的减小而随着钙含量的增加而降低。 (C) 1998 Elsevier Science B.V. 保留所有权利。
In order to improve the ionic conductivity of lithium in the (Li, La)NbO3 perovskite system due to the expansion of the lattice, we attempted to prepare three perovskite compounds (Li0.05La0.317)(1-x)Sr0.5xNbO3, (Li0.1La0.3)(1-x)Sr0.5xNbO3 and (Li0.25La0.25)(1-x)Sr0.5xNbO3 by the substitution of larger Sr2+ ions for smaller Lif ions and La3+ ions in Li0.05La0.317NbO3 (orthorhombic), Li0.1La0.3NbO3 (tetragonal) and Li0.25La0.25NbO3 (cubic), respectively. Also, the perovskite compounds (Li0.25La0.25)(1-x)Ca0.5xNbO3 were prepared by the substitution of smaller Ca2+ ions for larger La3+ ions for comparison. The enhancement of lithium ionic conductivity was confirmed in all the Sr2+ doped perovskite compounds because of the increase of the cell volume. Especially, the perovskite (Li0.25La0.25)(1-x)Sr0.5xNbO3 exhibited marked improvement of ionic conductivity (x = 0.125, 7.3 x 10(-5) S.cm(-1) at 25 degrees C) compared with that of the other perovskites ((Li0.05La0.317)(1-x)Sr0.5xNbO3 and (Li0.1La0.3)(1-x)Sr0.5xNbO3), on the contrary, the ionic conductivity of (Li0.25La0.25)(1-x)Ca0.5xNbO3 perovskite compounds decreased with increasing the amount of calcium due to the decrease of the cell volume. (C) 1998 Elsevier Science B.V. All rights reserved.