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Revealing the Role of Poly(vinylidene fluoride) Binder in Si/Graphite Composite Anode for Li-Ion Batteries
[Image: see text] The conventional polyvinylidene fluoride (PVDF) binder works well with the graphite anode, but when combined with silicon in composites to increase the energy density of Li-ion batteries, it results in severe capacity fade. Herein, by using scanning electron microscopy and energy-d...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2018
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6645060/ https://www.ncbi.nlm.nih.gov/pubmed/31459264 http://dx.doi.org/10.1021/acsomega.8b01388 |
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author | Zhao, Xiuyun Niketic, Svetlana Yim, Chae-Ho Zhou, Jigang Wang, Jian Abu-Lebdeh, Yaser |
author_facet | Zhao, Xiuyun Niketic, Svetlana Yim, Chae-Ho Zhou, Jigang Wang, Jian Abu-Lebdeh, Yaser |
author_sort | Zhao, Xiuyun |
collection | PubMed |
description | [Image: see text] The conventional polyvinylidene fluoride (PVDF) binder works well with the graphite anode, but when combined with silicon in composites to increase the energy density of Li-ion batteries, it results in severe capacity fade. Herein, by using scanning electron microscopy and energy-dispersive X-ray spectroscopy analyses, we reveal that this failure stems from the loss of connectivity between the silicon (or its agglomerates), graphite, and PVDF binder because of the mechanical stresses experienced during battery cycling. More importantly, we reveal for the first time that the PVDF binder undergoes chemical decomposition during the cycling of not only the composite but also the Si-only or even graphite-only electrodes despite the excellent battery performance of the latter. Through X-ray photoemission electron microscopy and X-ray photoelectron spectroscopy techniques, LiF was identified as the predominant decomposition product. We show that the distribution of LiF in the electrodes due to the differences in the interactions between PVDF and either Si or graphite could correlate with the performance of the battery. This study shows that the most suitable binder for the composite electrode is a polymer with a good chemical interaction with both graphite and silicon. |
format | Online Article Text |
id | pubmed-6645060 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-66450602019-08-27 Revealing the Role of Poly(vinylidene fluoride) Binder in Si/Graphite Composite Anode for Li-Ion Batteries Zhao, Xiuyun Niketic, Svetlana Yim, Chae-Ho Zhou, Jigang Wang, Jian Abu-Lebdeh, Yaser ACS Omega [Image: see text] The conventional polyvinylidene fluoride (PVDF) binder works well with the graphite anode, but when combined with silicon in composites to increase the energy density of Li-ion batteries, it results in severe capacity fade. Herein, by using scanning electron microscopy and energy-dispersive X-ray spectroscopy analyses, we reveal that this failure stems from the loss of connectivity between the silicon (or its agglomerates), graphite, and PVDF binder because of the mechanical stresses experienced during battery cycling. More importantly, we reveal for the first time that the PVDF binder undergoes chemical decomposition during the cycling of not only the composite but also the Si-only or even graphite-only electrodes despite the excellent battery performance of the latter. Through X-ray photoemission electron microscopy and X-ray photoelectron spectroscopy techniques, LiF was identified as the predominant decomposition product. We show that the distribution of LiF in the electrodes due to the differences in the interactions between PVDF and either Si or graphite could correlate with the performance of the battery. This study shows that the most suitable binder for the composite electrode is a polymer with a good chemical interaction with both graphite and silicon. American Chemical Society 2018-09-24 /pmc/articles/PMC6645060/ /pubmed/31459264 http://dx.doi.org/10.1021/acsomega.8b01388 Text en Copyright © 2018 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Zhao, Xiuyun Niketic, Svetlana Yim, Chae-Ho Zhou, Jigang Wang, Jian Abu-Lebdeh, Yaser Revealing the Role of Poly(vinylidene fluoride) Binder in Si/Graphite Composite Anode for Li-Ion Batteries |
title | Revealing the Role of Poly(vinylidene fluoride) Binder
in Si/Graphite Composite Anode for Li-Ion Batteries |
title_full | Revealing the Role of Poly(vinylidene fluoride) Binder
in Si/Graphite Composite Anode for Li-Ion Batteries |
title_fullStr | Revealing the Role of Poly(vinylidene fluoride) Binder
in Si/Graphite Composite Anode for Li-Ion Batteries |
title_full_unstemmed | Revealing the Role of Poly(vinylidene fluoride) Binder
in Si/Graphite Composite Anode for Li-Ion Batteries |
title_short | Revealing the Role of Poly(vinylidene fluoride) Binder
in Si/Graphite Composite Anode for Li-Ion Batteries |
title_sort | revealing the role of poly(vinylidene fluoride) binder
in si/graphite composite anode for li-ion batteries |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6645060/ https://www.ncbi.nlm.nih.gov/pubmed/31459264 http://dx.doi.org/10.1021/acsomega.8b01388 |
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