Grain boundary modification to suppress lithium penetration through garnet-type solid electrolyte

被引:142
作者
Basappa, Rajendra Hongahally [1 ]
Ito, Tomoko [1 ]
Morimura, Takao [1 ]
Bekarevich, Raman [2 ]
Mitsuishi, Kazutaka [2 ]
Yamada, Hirotoshi [1 ]
机构
[1] Nagasaki Univ, Grad Sch Engn, 1-14 Bunkyo Machi, Nagasaki 8528521, Japan
[2] Natl Inst Mat Sci, Global Res Ctr Environm & Energy Based Nanomat Sc, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan
基金
日本科学技术振兴机构;
关键词
Garnet-type solid electrolyte; Lithium growth; Short circuit; Grain boundary; Surface modification; Microstructure; DOPED LI7LA3ZR2O12; STABILITY; MICROSTRUCTURE; RESISTANCE; KINETICS; WATER;
D O I
10.1016/j.jpowsour.2017.07.088
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
Garnet-type solid electrolytes are one of key materials to enable practical usage of lithium metal anode for high-energy-density batteries. However, it suffers from lithium growth in pellets on charging, which causes short circuit. In this study, grain boundaries of Li6.5La3Zr1.5Ta0.5O12 (LLZT) pellets are modified with Li2CO3 and LiOH to investigate the influence of the microstructure of grain boundaries on lithium growth and to study the mechanism of the lithium growth. In spite of similar properties (relative density of ca. 96% and total ionic conductivity of 7 x 10(-4) S cm(-1) at 25 degrees C), the obtained pellets exhibit different tolerance on the short circuit. The LLZT pellets prepared from LiOH-modified LLZT powders exhibit rather high critical current density of 0.6 mA cm(-2), at which short circuit occurs. On the other hand, the LLZT pellets without grain boundary modification short-circuited at 0.15 mA cm(-2). Microstructural analyses by means of SEM, STEM and EIS suggest that lithium grows through interconnected open voids, and reveal that surface layers such as Li2CO3 and LiOH are not only plug voids but also facilitate the sintering of LLZT to suppress the lithium growth. The results indicate a strategy towards short-circuit-free lithium metal batteries. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:145 / 152
页数:8
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