Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7730098 | Journal of Power Sources | 2016 | 7 Pages |
Abstract
A multistep sintering schedule is developed to synthesize Li7La3Zr2O12 (LLZO) doped with 0.2 mol% Al3+. The effect of sintering steps on phase, relative density and ionic conductivity of Al-doped LLZO has been evaluated using powder X-Ray diffraction (XRD), scanning electron microscopy (SEM), 27Al magic spinning nuclear magnetic resonance (NMR) spectroscopy and electrochemical impedance spectroscopy (EIS). The results show that by holding the sample at 900 °C for 6 h, the mixture of tetragonal and cubic garnet phases are obtained; by continuously holding at 1100 °C for 6 h, the tetragonal phase completely transforms into cubic phase; by holding at 1200 °C, the relative density increases without decomposition of the cubic phase. The Al-LLZO pellets after multistep sintering exhibit cubic phase, relative density of 94.25% and ionic conductivity of 4.5 Ã 10â4 S cmâ1 at room temperature. Based on the observation, a sintering model is proposed and discussed.
Keywords
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Biyi Xu, Huanan Duan, Wenhao Xia, Yiping Guo, Hongmei Kang, Hua Li, Hezhou Liu,