The reaction of Li6.5La3Zr1.5Ta0.5O12 with water

被引：50

作者：

Li, Yutao ^{[1
,2
,3
]}

Han, Jian-Tao ^{[2
,3
]}

Vogel, Sven C. ^{[4
]}

Wang, Chang-An ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[2] Univ Texas Austin, Mat Res Program, Austin, TX 78712 USA

[3] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA

[4] Los Alamos Natl Lab, LANSCE Lujan Ctr, Los Alamos, NM 87545 USA

来源：

SOLID STATE IONICS | 2015年 / 269卷

基金：

中国国家自然科学基金;

关键词：

Li-ion solid electrolyte; Garnet; Lithium-ion batteries; Ion exchange; LITHIUM ION CONDUCTION; GARNET;

D O I：

10.1016/j.ssi.2014.11.010

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：

The Li-ion conductor "Li6.5La3Zr1.5Ta0.5O12" (LLZT) with garnet structure is prepared by solid-state reaction in an alumina crucible; its stability in water is investigated at room temperature. A Li+/H+ exchange is characterized by TGA, Li-7 and Al-27 MAS NMR, neutron diffraction, and TEM. In water, Li+/H+ exchange leads to a new garnet oxide "Li6.5-xHxLa3Zr1.5Ta0.5O12" (H-LLZT) with space group Ia-3d; the lattice parameter of H-LLZT is increased by the exchanged protons. Both LLZT and a grain boundary phase LiAlO2 are unstable in water. The exchanged protons in H-LLZT displace Li from the octahedral sites bridging the 24d tetrahedral sites; they form a strong O-H bond that distorted the site. The amorphous phase LiAlO2 in the grain boundary dissolves on exposure to water, which inhibits Li-ion transport across the grain boundary. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：57 / 61

页数：5

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