|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Materials for Green Energy
||Effect of Mo6+ Substitution on Microstructure and Lithium Ionic Conductivity of Garnet-Type Li7La3Zr2O12 Solid Electrolytes by Field Assisted Sintering Technology
||Fei Chen, Junyang Li, Yanhua Zhang, Dunjie Yang, Qiang Shen, Lianmeng Zhang
|On-Site Speaker (Planned)
Solid-state batteries with non-flammable inorganic solid electrolytes are one candidate to replace the currently-used liquid electrolyte. Garnet structure Li7La3Zr2O12, known as LLZO, with high mechanical, chemical, and electrochemical stability has been developed recently. In this study, Mo6+ doped Li6.5La3Zr1.75Mo0.25O12 (LLZM) solid electrolytes are successfully prepared via field assisted sintering technology (FAST). The effect of sintering temperature on the microstructure and lithium ionic conductivity is investigated. The results show that pure cubic phase LLZM can be obtained at a range of temperatures from 1050 to 1150 oC for no more than 10 min. For the sample sintered at 1150 oC, a maximum relative density of 95% with a total ionic conductivity as high as 1.3×10-4 S·cm-1 are obtained at room temperature. The ionic conductivity is ascribed to both the smaller ionic size of Mo6+ (0.62Å) to Zr4+ (0.72Å) and the higher valence of Mo6+ to Zr4+ which reduces the Li+ concentration.
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