| Densification and lithium ion conductivity of garnet-type Li7-xLa3Zr2-xTaxO12 （x=0.25） solid electrolytes |
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| 作者姓名： | 曹阳 李忆秋 郭向欣 |
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| 作者单位： | State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China |
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| 基金项目： | the National Natural Science Foundation of China（Grant No.U1232111）;the Hundred Talent Program of Chinese Academy of Sciences |
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| 摘 要： | The garnet-type Li7La3Zr2O12 ceramic is a promising solid electrolyte for all-solid-state secondary lithium batteries. However, it faces the problem of lithium volatilization during sintering, which may cause low density and deterioration of ionic conductivity. In this work, the effects of sintering temperature and addition on the density as well as the lithium ion conductivity of Li7-xLa3Zr2-xTaxO12 (LLZTO, x=0.25) ceramics prepared by solid state reaction have been studied. It is found that optimization of the sintering temperature leads to a minor increase in the ceramic density, yielding an optimum ionic conductivity of 2.9×10-4 S·cm-1 at 25℃. Introduction of Li 3 PO 4 addition in an appropriate concentration can obviously increase the density, leading to an optimum ionic conductivity of 7.2×10-4 S·cm-1 at 25℃. This value is superior to the conductivity data in most recent reports on the LLZTO ceramics.
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| 关 键 词： | 锂二次电池 离子导电性 固体电解质 石榴石型 离子电导率 烧结温度 离子传导性 烧结过程 |
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