Sintering, micro-structure and Li+ conductivity of Li7-xLa3Zr2-xNbxO12/MgO (x=0.2-0.7) Li-Garnet composite ceramics

被引:54
作者
Huang, Xiao [1 ,4 ]
Song, Zhen [2 ]
Xiu, Tongping [3 ]
Badding, Michael E. [2 ]
Wen, Zhaoyin [1 ,4 ]
机构
[1] Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China
[2] Corning Inc, Corning, NY 14831 USA
[3] Corning Res Ctr China, 200 Jinsu Rd, Shanghai 201206, Peoples R China
[4] Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Li-Garnet; c-LLZO; Solid electrolyte; Nb-doping; High conductivity; Sintering; HIGH IONIC-CONDUCTIVITY; DOPED LI7LA3ZR2O12; CRYSTAL-STRUCTURE; ELECTROCHEMICAL PROPERTIES; NB; SUBSTITUTION; LI5LA3NB2O12; STABILITY; AL; ELECTROLYTES;
D O I
10.1016/j.ceramint.2018.09.133
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nb-doped Li7La3Zr2O12 (Nb-LLZO) is one of the promising electrolyte candidates in the Li-Garnet family due to its high Li-ion conductivity. The sintered Nb-LLZO ceramics, however, often exhibit abnormal grain growth with high porosity and poor mechanical properties. For advantaged electrochemical and mechanical properties, a uniform and dense microstructure is desired. In this research, MgO has been added as a secondary phase to inhibit abnormal grain growth in Nb-LLZO. The sintering process of the Nb-LLZO/MgO composite ceramics has been studied for different Nb doping levels (0.2-0.7 pfu) at sintering conditions of 1250 degrees C for 1-360 min. The ceramic density, microstructure, and Li-ion conductivity are reported. The composite ceramics have shown a very fast sintering speed. At 1250 degrees C, the 0.4Nb-LLZO/MgO composite can be well-sintered in 1 min. For sintering at 1250 degrees C for 40 min, ceramic samples showing relative density of 97%, conductivity of 6 x 10(-4) S cm(-1) at 25 degrees C, and activation energy of 0.40 eV are obtained.
引用
收藏
页码:56 / 63
页数:8
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