The structural evolution of tetradymite-type Sb2Te3 in alkali ion batteries
| Autor: | Conrad H. R. Gillard, Neeraj Sharma, Maxim Avdeev, Partha P. Jana |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Superconductivity
Materials science Mechanical Engineering Intercalation (chemistry) Metals and Alloys Analytical chemistry Tetradymite 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Alkali metal Electrochemistry 01 natural sciences Structural evolution 0104 chemical sciences Ion Volume (thermodynamics) Mechanics of Materials Materials Chemistry engineering 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 871:159378 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2021.159378 |
| Popis: | Tetradymite-type Sb2Te3 is synthesised via a solid-state method, and its electrochemical phase evolution in Li, Na and K half-cells is experimentally investigated. Ex-situ X-ray diffraction data is analysed with the Rietveld method, revealing the occurrence of conversion reactions for all systems. Direct evidence of alloying and intercalation reactions is observed in the case of the Li system, while alloying is inferred for the K and Na systems. For the first time, Li intercalated Sb2Te3 is synthesised and a preliminary investigation of its magnetic properties is undertaken. Li intercalation does not significantly influence the magnetic phase transition temperature and does not appear to induce superconductivity. In addition, a preliminary study of the performance of Sb2Te3 as an electrode material for rechargeable Li, Na and K-half cells is undertaken. High initial capacities of 588, 521 and 906 mAh/g for Li, Na and K cells respectively are observed. However, capacity fade is rapid in all cases, with second discharge capacities dropping to 396, 173 and 98 mAh/g. This poor cyclability is generally associated with the large volume changes and irreversibilities associated with the conversion and alloying reactions. The capacities continue to decrease during extended cycling, with tenth cycle discharge capacities of 195, 26 and 24 mAh/g for Li, Na and K half cells respectively. |
| Databáze: | OpenAIRE |
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