Effect of Al2O3 on the sintering of garnet-type Li6.5La3Zr1.5Ta0.5O12

被引：52
作者：
Wang, Yuxing [1 ]
Yan, Pengfei [1 ]
Xiao, Jie [1 ]
Lu, Xiaochuan [1 ]
Zhang, Ji-Guang [1 ]
Sprenkle, Vincent L. [1 ]
机构：
[1] Pacific NW Natl Lab, Richland, WA 99352 USA
来源：
SOLID STATE IONICS | 2016年 / 294卷
关键词：
Garnet oxide; Lithium ion conductor; Solid electrolyte; Liquid-phase sintering; Al2O3; STATE LITHIUM BATTERIES; HIGH IONIC-CONDUCTIVITY; SOLID ELECTROLYTES; CONDUCTORS LI7LA3ZR2O12; SUPERIONIC CONDUCTOR; TRANSPORT-PROPERTIES; LI BATTERIES; AL; TA; LI-7-XLA3ZR2-XTAXO12;
D O I：
10.1016/j.ssi.2016.06.013
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
It is widely recognized that Al plays a dual role in the fabrication of garnet-type solid electrolytes, i.e., as a dopant that stabilizes the cubic structure and a sintering aid that facilitates the densification. However, the sintering effect of Al2O3 has not been well understood so far because Al is typically "unintentionally" introduced into the sample from the crucible during the fabrication process. In this study, we have investigated the sintering effect of Al on the phase composition, microstructure, and ionic conductivity of Li6.5La3Zr1.5Ta0.5O12 by using an Al-free crucible and intentionally adding various amounts of gamma-Al2O3. It was found that the densification of Li6.5La3Zr1.5Ta0.5O12 occurred via liquid-phase sintering, with evidence of morphology change among different compositions. Among all of the compositions, samples with 0.05 mol Al per unit formula of garnet oxide (i.e., 0.3 wt% Al2O3) exhibited the optimal microstructure and the highest total ionic conductivity of 5 x 10(-4) S cm(-1) at room temperature. (C) 2016 Elsevier B.V. All rights reserved.
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页码：108 / 115
页数：8
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