Dense Sphene-type Solid Electrolyte Through Rapid Sintering for Solid-state Lithium Metal Battery  

作　　者：WANG Yongtao GUO Xianwei LIN Zhivuan YANG Yubo WU Lingqiao LIU Huan YU Haijun 

机构地区：[1]College of Materials Science&Engineering,Key Laboratory of Advanced Functional Materials,hlinistty of Education,Beijing University of Technology,Beijing 100124,P.R.China

出　　处：《Chemical Research in Chinese Universities》2020年第3期439-446,共8页高等学校化学研究（英文版）

基　　金：the Natural Science Foundation of Beijing,China(Nos.KZ20190005002,JQ19003,L182009);the National Natural Science Foundation of China(Nos.51622202,21974007);the National Key R&D Program of China(No.2018YFB0104300);the Project of Youth Talent Plan of Beijing Municipal Education Commission,China(No.CIT&TCD201804013)。

摘　　要：The sphene-type solid electrolyte with high ionic conductivity has been designed for solid-state lithium metal battery.However,the practical applications of solid electrolytes are still suffered by the low relative density and long sintering time of tens of hous with large energy consumption.Here,we introduced the spark plasma sintering technology for fabricating the sphene-type Li1.125Ta0.875Zr0.125SiO5 solid electrolyte.The dense electrolyte pellet with high relative density of ca.97.4% and ionic conductivity of ca.1.44×10^-5S/cm at 30℃ can be obtained by spark plasma sintering process within the extremely short time of only ca.0.1h.Also the solid electrolyte provides stable electrochemical window of ca.6.0V(vs.Li^+/Li)and high electrochemical interface stability toward Li metal anodc.With the enhanced interfacial contacts between electrodes and electrolyte pellet by the in-situ formed polymer electrolyte,the solid-state lithium metal battery with LiFePO4 cathode can deliver the initial discharge capacity of ca.154mA·h/g at 0.1C and the reversible capacity of ca.132mA·h/g after 70 cycles with high Coulombic efficienty of 99.5% at 55℃.Therefore,this study demonstrates a rapid and energy efficient sintering strategy for fabricating the solid electrolyte with dense structure and high ionic conductivity that can be practically applied in solid-state lithium metal batteries with high energy densities and safeties.

关 键 词：Solid-state lithium metal battery Sphene-type solid electrolyte Spark plasma sintering Dense structure Ionic conductivity 

分 类 号：TM912[电气工程—电力电子与电力传动]