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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
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机构:
Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China
Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

Song, Zhen
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机构:
Corning Inc, Corning, NY 14831 USA Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

Xiu, Tongping
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机构:
Corning Res Ctr China, 200 Jinsu Rd, Shanghai 201206, Peoples R China Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

Badding, Michael E.
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机构:
Corning Inc, Corning, NY 14831 USA Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

Wen, Zhaoyin
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h-index: 0
机构:
Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China
Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China
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.
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页码:56 / 63
页数:8
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