Dual Substitution and Spark Plasma Sintering to Improve Ionic Conductivity of Garnet Li7La3Zr2O12

被引：16
作者：
Dong, Zhencai [1 ]
Xu, Chao [2 ]
Wu, Yongmin [3 ]
Tang, Weiping [3 ]
Song, Shufeng [1 ]
Yao, Jianyao [1 ]
Huang, Zhengyong [2 ]
Wen, Zhaoyin [4 ]
Lu, Li [5 ,6 ]
Hu, Ning [1 ,7 ,8 ]
机构：
[1] Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Coll Elect Engn, Chongqing 400044, Peoples R China
[3] Shanghai Inst Space Power Sources, State Key Lab Space Power Sources Technol, Shanghai 200245, Peoples R China
[4] Chinese Acad Sci, CAS Key Lab Mat Energy Convers, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
[5] Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore
[6] Natl Univ Singapore, Suzhou Res Inst, Suzhou 215024, Peoples R China
[7] Hebei Univ Technol, Sch Mech Engn, Tianjin 300401, Peoples R China
[8] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China
来源：
NANOMATERIALS | 2019年 / 9卷 / 05期
基金：
中国国家自然科学基金;
关键词：
garnet; dual substitution; spark plasma sintering; conductivity; LITHIUM; ELECTROLYTE; BATTERIES; GA; TA; AL;
D O I：
10.3390/nano9050721
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Garnet Li7La3Zr2O12 is one of the most promising solid electrolytes used for solid-state lithium batteries. However, low ionic conductivity impedes its application. Herein, we report Ta-doping garnets with compositions of Li7-xLa3Zr2-xTaxO12 (0.1 <= x <= 0.75) obtained by solid-state reaction and free sintering, which was facilitated by graphene oxide (GO). Furthermore, to optimize Li6.6La3Zr1.6Ta0.4O12, Mg2+ was select as a second dopant. The dual substitution of Ta5+ for Zr4+ and Mg2+ for Li+ with a composition of Li6.5Mg0.05La3Zr1.6Ta0.4O12 showed an enhanced total ionic conductivity of 6.1 x 10(-4) S cm(-1) at room temperature. Additionally, spark plasma sintering (SPS) was applied to further densify the garnets and enhance their ionic conductivities. Both SPS specimens present higher conductivities than those produced by the conventional free sintering. At room temperature, the highest ionic conductivity of Li6.5Mg0.05La3Zr1.6Ta0.4O12 sintered at 1000 degrees C is 8.8 x 10(-4) S cm(-1), and that of Li6.6La3Zr1.6Ta0.4O12 sintered at 1050 degrees C is 1.18 x 10(-3) S cm(-1).
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页数：10
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