Knozowski, Dominik ; Graczyk-Zajac, Magdalena ; Vrankovic, Dragoljub ; Trykowski, Grzegorz ; Sawczak, Mirosław ; De Carolis, Dario M. ; Wilamowska-Zawłocka, Monika (2021)
New insights on lithium storage in silicon oxycarbide/carbon composites: Impact of microstructure on electrochemical properties.
In: Composites Part B: Engineering, 225
doi: 10.1016/j.compositesb.2021.109302
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In this work, we study the impact of the preceramic precursor vinyltriethoxysilane (VTES) on the electrochemical performance of silicon oxycarbide (SiOC) glass/graphite composites. We apply an innovative approach based on high-power ultrasounds in order to obtain highly homogenous composites with a uniform distribution of small graphitic flakes. This procedure enhances gelation and drying of VTES-based preceramic polymer/graphite blends. The SiOC/graphite composites reveal stable capacities (up to 520 mAh g-1 after 270 cycles), which are much higher than the sum derived from the ratio of the components. Additionally, the first cycle Coulombic efficiencies obtained for the composites are 15% higher than that of the pristine VTES-based SiOC ceramic. These properties are identified as the synergistic effect, originated from the addition of graphite to VTES-based SiOCs. Interestingly, such improvement in electrochemical performance is not noticed in the case of analogous SiOC/ graphite composites based on phenyltriethoxysilane (PhTES) precursor. The microstructural investigation of the composites based on two different preceramic precursors using solid-state 29Si NMR and Raman Spectroscopy unveils the reason for such discrepancy in their electrochemical behaviour. Keywords
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Knozowski, Dominik ; Graczyk-Zajac, Magdalena ; Vrankovic, Dragoljub ; Trykowski, Grzegorz ; Sawczak, Mirosław ; De Carolis, Dario M. ; Wilamowska-Zawłocka, Monika |
| Art des Eintrags: | Bibliographie |
| Titel: | New insights on lithium storage in silicon oxycarbide/carbon composites: Impact of microstructure on electrochemical properties |
| Sprache: | Englisch |
| Publikationsjahr: | 15 November 2021 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Composites Part B: Engineering |
| Jahrgang/Volume einer Zeitschrift: | 225 |
| DOI: | 10.1016/j.compositesb.2021.109302 |
| Kurzbeschreibung (Abstract): | In this work, we study the impact of the preceramic precursor vinyltriethoxysilane (VTES) on the electrochemical performance of silicon oxycarbide (SiOC) glass/graphite composites. We apply an innovative approach based on high-power ultrasounds in order to obtain highly homogenous composites with a uniform distribution of small graphitic flakes. This procedure enhances gelation and drying of VTES-based preceramic polymer/graphite blends. The SiOC/graphite composites reveal stable capacities (up to 520 mAh g-1 after 270 cycles), which are much higher than the sum derived from the ratio of the components. Additionally, the first cycle Coulombic efficiencies obtained for the composites are 15% higher than that of the pristine VTES-based SiOC ceramic. These properties are identified as the synergistic effect, originated from the addition of graphite to VTES-based SiOCs. Interestingly, such improvement in electrochemical performance is not noticed in the case of analogous SiOC/ graphite composites based on phenyltriethoxysilane (PhTES) precursor. The microstructural investigation of the composites based on two different preceramic precursors using solid-state 29Si NMR and Raman Spectroscopy unveils the reason for such discrepancy in their electrochemical behaviour. Keywords |
| Freie Schlagworte: | Polymer derived ceramics, Composites, Graphite, Li-ion battery, Sol-gel synthesis, Anode Material, High-Capacity, Electrode Materials, Natural Graphite, SIOC, Carbon, Intercalation, Performance, Batteries, Mechanism |
| Zusätzliche Informationen: | Foundation for Polish Science under REINTEGRATION program, Grant No. POIR.04.04.00-00-4582/17-00. German Research Foundation (DFG), Grant No. GR 4440/4-1 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| TU-Projekte: | DFG|GR4440/4-1|Jenseits der Li-Ione |
| Hinterlegungsdatum: | 09 Nov 2021 06:23 |
| Letzte Änderung: | 09 Nov 2021 06:23 |
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