Preparation of Li₇La₃Zr₂O₁₂ solid electrolyte via a sol-gel method

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• 作者：Masashi Kotobuki ; Masaki Koishi
• 关键词：Solid electrolyte ; Lithium battery ; Sol&ndash ; gel method ; Garnet-type electrolyte
• 刊名：Ceramics International
• 出版年：April, 2014
• 年：2014
• 卷：40
• 期：3
• 页码：5043-5047
• 全文大小：1110 K

文摘

In this research, Li₇La₃Zr₂O₁₂ (LLZ), which has been recognized as a promising solid electrolyte for next-generation Li-ion batteries, is prepared by a sol-gel method to lower the calcination temperature. A precursor sol is prepared from lithium acetate, lanthanum acetate and zirconium tetrabutoxide. After gelation, the gel is heated at 700 掳C, and a white powder, which consisted mainly of La₂Zr₂O₇, is obtained. Sintered pellets are prepared by calcination at 1000 掳C or 1100 掳C. The tetragonal-phase LLZ with low Li-ion conductivity is contained in the pellet calcined at 1000 掳C. After the calcination at 1100 掳C, the tetragonal LLZ transforms into a cubic phase which possesses high Li-ion conductivity. With the sol-gel method, the cubic-phase LLZ can be obtained after calcination at 1100 掳C, which is 130 掳C lower than the temperature in conventional solid-state reaction. The Li-ion conductivity of the prepared cubic LLZ is 1.5脳10^鈭? S cm^鈭?, which is comparable with the previously reported values. It is concluded that the cubic LLZ with high Li-ion conductivity can be successfully prepared at low temperature using the sol-gel method.