MgO or Al2O3 crucible: Which is better for the preparation of LLZ-based solid electrolytes? |
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| Affiliation: | 1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China;2. School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China;3. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;4. Wuhan NARI Limited Company of State Grid Electric Power Research Institute, Wuhan 430070, China;1. CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, PR China;2. Corning Incorporated, Corning, NY 14831, USA;3. Corning Research Center China, 200 Jinsu Road, Shanghai 201206, PR China;4. University of Chinese Academy of Sciences, 19?A Yuquan Rd, Shijingshan District, Beijing 100049, PR China;1. College of Materials Science and Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, Jiangsu 210009, PR China;2. Lejin Chemical (Nanjing) Information Material Co., Ltd, No. 17 Hengyi Road, Nanjing, Jiangsu 210038, PR China |
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| Abstract: | Lithium lanthanum zirconate (Li7La3Zr2O12, LLZ) solid electrolytes were usually prepared by using Al2O3 crucibles and/or Al3+ dopants in order to stablize the formation of cubic garnet phase. In this work, we argue that Al-free MgO crucible could be better for the preparation of LLZ-based solid electrolytes through a detailed comparison of LLZ-Ga0.2 samples prepared respectively by using MgO and Al2O3 crucibles. The solid-state reaction method was firstly used to prepare Li7-3xGaxLa3Zr2O12 (x = 0–0.4) pellets by using Al-free MgO crucibles, which were sintered at 1100 °C for 12 h. The highly conductive cubic phase was obtained at Ga3+ doping content as low as x = 0.05 and the highest room-temperature conductivity was obtained at x = 0.2. Al2O3 crucible was then used to prepare the LLZ-Ga0.2 pellet for comparing the influence of these two different crucibles. The results show that a higher lattice parameter (a = 12.9762 (8) Å), a higher relative density (95.5%) and a higher room-temperature ionic conductivity (1.352 (3) mS/cm) were achieved by using the MgO crucible. |
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| Keywords: | Solid electrolyte MgO crucible Relative density Ionic conductivity |
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