The phase evolution of tetradymite-type bismuth selenide in alkali ion batteries
| Autor: | Neeraj Sharma, Maxim Avdeev, Conrad H. R. Gillard, Partha P. Jana, Kathleen Djohari |
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| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Materials science Intercalation (chemistry) Analytical chemistry Tetradymite 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Ion Inorganic Chemistry chemistry.chemical_compound Materials Chemistry Physical and Theoretical Chemistry equipment and supplies 021001 nanoscience & nanotechnology Condensed Matter Physics Alkali metal Phase evolution 0104 chemical sciences Electronic Optical and Magnetic Materials Volume (thermodynamics) chemistry Ceramics and Composites engineering Bismuth selenide 0210 nano-technology |
| Zdroj: | Journal of Solid State Chemistry. 300:122241 |
| ISSN: | 0022-4596 |
| Popis: | Tetradymite-type Bi2Se3 is synthesised via a solid-state method, and its phase evolution in Li, Na and K half-cells is experimentally investigated. Ex-situ X-ray diffraction data is analysed with the Rietveld method, indicating intercalation, conversion and alloying reactions for all systems. Direct evidence of alloying is observed in the cases of the Li and Na systems while alloying is inferred for the K system. In addition, a preliminary study of the performance of Bi2Se3 as an electrode material for rechargeable Li, Na and K-half cells is undertaken. High initial capacities of 560, 680 and 1000 mAh/g for Li, Na and K respectively are observed. However, capacity fade is severe in all cases, with 10th cycle capacity decreases of 68%, 79% and 90% respectively. This poor cyclability is likely attributable to the large volume changes that accompany the conversion and alloying reactions. Finally, the magnetic properties of the resultant intercalated materials are investigated. Li intercalation induces a divergence between zero-field cooled and field cooled curves below 150 K, whereas Na and K intercalation do not have significant effects on the observed magnetic properties. |
| Databáze: | OpenAIRE |
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