Silicon–Germanium bilayer sputtered onto a carbon nanotube sheet as anode material for lithium–ion batteries
| Autor: | Noor Mustafa, Nasr Bensalah, Fadi Z. Kamand, Maha Matalqeh |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Thin films chemistry.chemical_element Germanium 02 engineering and technology Substrate (electronics) Chemical vapor deposition 010402 general chemistry 01 natural sciences law.invention Amorphous materials law Electrochemical reactions Materials Chemistry Thin film Mechanical Engineering Metals and Alloys Sputter deposition 021001 nanoscience & nanotechnology Vapor deposition Cathode 0104 chemical sciences Anode chemistry Chemical engineering Mechanics of Materials SEM Lithium Electrode materials 0210 nano-technology Scanning electron microscopy |
| Popis: | In this work, multiwalled carbon nanotube-silicon/germanium (MWCNT-Si/Ge) electrodes were prepared by layer-by-layer deposition of Si and Ge films onto an MWCNT sheet using RF magnetron sputtering. The MWCNT-Si/Ge composites were characterized by spectroscopy and microscopy techniques, which confirmed the deposition of amorphous Si and Ge films. The as-prepared Si/Ge@MWCNT composites were tested as an anode material in a half cell using Li metal as counter and reference electrodes, and in a full cell using LiFePO4 as a cathode. MWCNT-Si/Ge showed a greater charge capacity retention (88% capacity retention) than MWCNT-Si (72% capacity retention) and Cu–Si/Ge (12% capacity retention) after 50 GCD cycles, confirming the important roles of the Ge layer and MWCNT substrate in the enhancement of the performance of Si-based anodes. The results confirmed that the lithium storage performance of the Si film was enhanced by the deposition of the Ge film on the surface. Si/Ge@MWCNT composites exhibited stable electrochemical performance during the first 50 cycles at 500 mA/g, with a reversible specific capacity greater than 1580 mAh/g. The MWCNT-Si/Ge composite anode exhibited a specific charge capacity of 1975 mAh/g at a current density of 200 mA/g, 1725 mAh/g at 500 mA/g, 1635 mAh/g at 1000 mA/g, 1580 mAh/g at 2000 mA/g, and 1472 mAh/g at 3000 mA/g. The MWCNT-Si//LiFePO4 full cell displayed satisfactory cycling performance. This work was funded by a grant from the Qatar National Research Fund under its National Priorities Research Program award number NPRP7-567-2-216 . Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the Qatar National Research Fund . The authors also thank Qatar University for supporting this work through a student grant number QUST-1-CAS-2019-44 . Appendix A Scopus |
| Databáze: | OpenAIRE |
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