Non-equilibrium microstructure of Li1.4Al0.4Ti1.6(PO4)3 superionic conductor by spark plasma sintering for enhanced ionic conductivity
| Autor: | Junxi Yu, Yazhou Ren, Ehsan Nasr Esfahani, Hongyun Jin, Jiangyu Li, Ying Chen, Luhua Lu, Jiale Liu, Xiaocong Tian, Shanshan Duan, Bing Yang, Shuen Hou |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Ionic bonding Spark plasma sintering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Amorphous solid Crystallinity Chemical physics visual_art visual_art.visual_art_medium Ionic conductivity General Materials Science Grain boundary Ceramic Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Nano Energy. 51:19-25 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2018.06.050 |
| Popis: | In solid-state electrolytes, the large resistance at grain boundaries remains the bottleneck for high ionic conductivity. Here we develop an alternative and somewhat counterintuitive strategy to enhance their ionic conductivity via non-equilibrium microstructure. Using Li1.4Al0.4Ti1.6(PO4)3 as an example, we demonstrate that semi-crystalline interphase between well crystallized ceramic phase and amorphous glass phase can be induced by spark plasma sintering, resulting in total ionic conductivity of 1.3 × 10−3 S cm−1 without any doping, which is 2 orders of magnitude higher than that derived by the conventional method. It is further demonstrated that the non-equilibrium structure is stable in ambient condition, yet can be converted into equilibrium structure by annealing with higher crystallinity but much lower ionic conductivity, proving that the non-equilibrium structure is indeed the key to the high performance. This opens door for its applications in electric vehicles, and the strategy is applicable to other ionic systems as well. |
| Databáze: | OpenAIRE |
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