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https://hdl.handle.net/123456789/1574| Τύπος: | Άρθρο σε επιστημονικό περιοδικό |
| Τίτλος: | Study of the role of void and residual silicon dioxide on the electrochemical performance of silicon nanoparticles encapsulated by graphene |
| Συγγραφέας: | [EL] Αργυρόπουλος, Δημήτριος - Παναγιώτης[EN] Argyropoulos, Dimitris - Panagiotis [EL] Ζαρδαλίδης, Γεώργιος[EN] Zardalidis, Georgios [EL] Γιωτάκος, Παναγιώτης[EN] Giotakos, Panagiotis [EL] Δαλέτου, Μαρία[EN] Daletou, Maria [EL] Φαρμάκης, Φίλιππος[EN] Farmakis, Filippos |
| Ημερομηνία: | 27/10/2021 |
| Περίληψη: | Silicon nanoparticles are used to enhance the anode specific capacity for the lithium-ion cell technology. Due to the mechanical deficiencies of silicon during lithiation and delithiation, one of the many strategies that have been proposed consists of enwrapping the silicon nanoparticles with graphene and creating a void area between them so as to accommodate the large volume changes that occur in the silicon nanoparticle. This work aims to investigate the electrochemical performance and the associated kinetics of the hollow outer shell nanoparticles. To this end, we prepared hollow outer shell silicon nanoparticles (nps) enwrapped with graphene by using thermally grown silicon dioxide as a sacrificial layer, ball milling to enwrap silicon particles with graphene and hydro fluorine (HF) to etch the sacrificial SiO2 layer. In addition, in order to offer a wider vision on the electrochemical behavior of the hollow outer shell Si nps, we also prepared all the possible in-between process stages of nps and corresponding electrodes (i.e., bare Si nps, bare Si nps enwrapped with graphene, Si/SiO2 nps and Si/SiO2 nps enwrapped with graphene). The morphology of all particles revealed the existence of graphene encapsulation, void, and a residual layer of silicon dioxide depending on the process of each nanoparticle. Corresponding electrodes were prepared and studied in half cell configurations by means of galvanostatic cycling, cyclic voltammetry and electrochemical impedance spectroscopy. It was observed that nanoparticles encapsulated with graphene demonstrated high specific capacity but limited cycle life. In contrast, nanoparticles with void and/or SiO2 were able to deliver improved cycle life. It is suggested that the existence of the void and/or residual SiO2 layer limits the formation of rich LiXSi alloys in the core silicon nanoparticle, providing higher mechanical stability during the lithiation and delithiation processes |
| Γλώσσα: | Αγγλικά |
| Σελίδες: | 15 |
| DOI: | 10.3390/nano11112864 |
| EISSN: | 2079-4991 |
| Θεματική κατηγορία: | [EL] Ενέργεια και Καύσιμα[EN] Energy and Fuels [EL] Ηλεκτροχημεία[EN] Electrochemistry [EL] Νανοϋλικά[EN] Nano-materials |
| Λέξεις-κλειδιά: | silicon nanoparticles; anode; lithium-ion; Graphene; void |
| Κάτοχος πνευματικών δικαιωμάτων: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
| Όροι και προϋποθέσεις δικαιωμάτων: | This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). |
| Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη: | https://www.mdpi.com/2079-4991/11/11/2864 |
| Ηλεκτρονική διεύθυνση περιοδικού: | https://www.mdpi.com/journal/nanomaterials |
| Τίτλος πηγής δημοσίευσης: | Nanomaterials |
| Τεύχος: | 11 |
| Τόμος: | 11 |
| Σελίδες τεκμηρίου (στην πηγή): | Article no 2864 |
| Σημειώσεις: | This research is co-financed by Greece and the European Union (European Social Fund— ESF) through the Operational Program «Human Resources Development, Education and Lifelong Learning 2014–2020» in the context of the project “Fabrication, characterization and modeling of silicon nanoparticles decorated with graphene shell, as anodes for lithium-ion battery cells” (MIS 5049909). |
| Εμφανίζεται στις συλλογές: | Ερευνητικές ομάδες |
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