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Synthesis and Electrochemical Performance of π-Conjugated Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for Lithium-Ion Batteries
[Image: see text] π-Conjugated molecule bridged silicon quantum dots (Si QDs) cluster was prepared by Sonogashira C–C cross-coupling reaction between 4-bromostyryl and octyl co-capped Si QDs (4-Bs/Oct Si QDs) and 1,4-diethynylbenzene. The surface chemical structure, morphology, and chemical composit...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2020
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7178376/ https://www.ncbi.nlm.nih.gov/pubmed/32337426 http://dx.doi.org/10.1021/acsomega.0c00019 |
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author | Choi, Young-Hwa Park, Hyeonbeom Lee, Sunyoung Jeong, Hyun-Dam |
author_facet | Choi, Young-Hwa Park, Hyeonbeom Lee, Sunyoung Jeong, Hyun-Dam |
author_sort | Choi, Young-Hwa |
collection | PubMed |
description | [Image: see text] π-Conjugated molecule bridged silicon quantum dots (Si QDs) cluster was prepared by Sonogashira C–C cross-coupling reaction between 4-bromostyryl and octyl co-capped Si QDs (4-Bs/Oct Si QDs) and 1,4-diethynylbenzene. The surface chemical structure, morphology, and chemical composition of the Si QD cluster were confirmed by Fourier transform infrared spectroscopy, field emission transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Lithium-ion batteries were fabricated using 4-Bs/Oct Si QD and Si QD clusters as anode materials to investigate the effect of QD clustering on the electrochemical performance. Compared with the 4-Bs/Oct Si QD electrode, the Si QD cluster exhibits improved electrochemical performance, such as a high initial discharge capacity of ∼1957 mAh/g and good cycling stability with ∼63% capacity retention following 100 cycles at a current rate of 200 mA/g when tested at the voltage window of 0.01–2.5 V. The improved electrochemical performance of the Si QD cluster is attributed to the π-conjugated molecules between the Si QDs and on the surface of Si QD cluster, which serve as a buffer layer to alleviate the mechanical stresses arising from the alloying reaction of Si with lithium and maintain the electrical conduits in the anode system. |
format | Online Article Text |
id | pubmed-7178376 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-71783762020-04-24 Synthesis and Electrochemical Performance of π-Conjugated Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for Lithium-Ion Batteries Choi, Young-Hwa Park, Hyeonbeom Lee, Sunyoung Jeong, Hyun-Dam ACS Omega [Image: see text] π-Conjugated molecule bridged silicon quantum dots (Si QDs) cluster was prepared by Sonogashira C–C cross-coupling reaction between 4-bromostyryl and octyl co-capped Si QDs (4-Bs/Oct Si QDs) and 1,4-diethynylbenzene. The surface chemical structure, morphology, and chemical composition of the Si QD cluster were confirmed by Fourier transform infrared spectroscopy, field emission transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Lithium-ion batteries were fabricated using 4-Bs/Oct Si QD and Si QD clusters as anode materials to investigate the effect of QD clustering on the electrochemical performance. Compared with the 4-Bs/Oct Si QD electrode, the Si QD cluster exhibits improved electrochemical performance, such as a high initial discharge capacity of ∼1957 mAh/g and good cycling stability with ∼63% capacity retention following 100 cycles at a current rate of 200 mA/g when tested at the voltage window of 0.01–2.5 V. The improved electrochemical performance of the Si QD cluster is attributed to the π-conjugated molecules between the Si QDs and on the surface of Si QD cluster, which serve as a buffer layer to alleviate the mechanical stresses arising from the alloying reaction of Si with lithium and maintain the electrical conduits in the anode system. American Chemical Society 2020-04-07 /pmc/articles/PMC7178376/ /pubmed/32337426 http://dx.doi.org/10.1021/acsomega.0c00019 Text en Copyright © 2020 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Choi, Young-Hwa Park, Hyeonbeom Lee, Sunyoung Jeong, Hyun-Dam Synthesis and Electrochemical Performance of π-Conjugated Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for Lithium-Ion Batteries |
title | Synthesis and Electrochemical Performance of π-Conjugated
Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for
Lithium-Ion Batteries |
title_full | Synthesis and Electrochemical Performance of π-Conjugated
Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for
Lithium-Ion Batteries |
title_fullStr | Synthesis and Electrochemical Performance of π-Conjugated
Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for
Lithium-Ion Batteries |
title_full_unstemmed | Synthesis and Electrochemical Performance of π-Conjugated
Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for
Lithium-Ion Batteries |
title_short | Synthesis and Electrochemical Performance of π-Conjugated
Molecule Bridged Silicon Quantum Dot Cluster as Anode Material for
Lithium-Ion Batteries |
title_sort | synthesis and electrochemical performance of π-conjugated
molecule bridged silicon quantum dot cluster as anode material for
lithium-ion batteries |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7178376/ https://www.ncbi.nlm.nih.gov/pubmed/32337426 http://dx.doi.org/10.1021/acsomega.0c00019 |
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