Microstructural and Electrochemical Properties of Alkaline Earth Metal-Doped Li Garnet-Type Solid Electrolytes Prepared by Solid-State Sintering and Spark Plasma Sintering Methods
| Autor: | Tomoko Ito, Hirotoshi Yamada, Sanoop Palakkathodi Kammampata, Venkataraman Thangadurai, Rajendra Hongahally Basappa |
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| Rok vydání: | 2019 |
| Předmět: |
Solid-state chemistry
Materials science Scanning electron microscope Analytical chemistry Energy Engineering and Power Technology Sintering Spark plasma sintering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy 0104 chemical sciences Dielectric spectroscopy Materials Chemistry Electrochemistry Fast ion conductor Chemical Engineering (miscellaneous) Ionic conductivity Electrical and Electronic Engineering 0210 nano-technology Powder diffraction |
| Zdroj: | ACS Applied Energy Materials. 2:1765-1773 |
| ISSN: | 2574-0962 |
| DOI: | 10.1021/acsaem.8b01899 |
| Popis: | Li-stuffed garnet-type solid Li-ion electrolytes have been considered as a promising candidate for all-solid-state Li batteries. In this work, alkaline earth metal-doped Li garnet-type solid Li-ion electrolytes, Li6.5La2.5A0.5TaZrO12 (A = Ca, Sr, Ba) were prepared by conventional solid-state sintering (CSS) and spark plasma sintering (SPS) methods. The effect of sintering methods on the structural and electrochemical properties of the solid electrolytes was investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). Among the investigated compounds, Sr-doped garnet-type Li6.5La2.5Sr0.5TaZrO12 prepared by the SPS method showed the highest Li-ion conductivity of 3.08 × 10–4 S cm–1 at 20 °C and the lowest activation energy of 0.35 eV. Both Sr- and Ba-doped samples exhibited a critical current density of 0.15 mA cm–2, and the Sr-doped Li6.5La2.5Sr0.5TaZrO12 sample showed the lowest Li-ion charge-transfer resistance of 139 Ω cm2 at room... |
| Databáze: | OpenAIRE |
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