Kaspar, Jan ; Graczyk-Zajac, Magdalena ; Choudhury, Soumyadip ; Riedel, Ralf (2016)
Impact of the electrical conductivity on the lithium capacity of polymer-derived silicon oxycarbide (SiOC) ceramics.
In: Electrochimica Acta, 216
doi: 10.1016/j.electacta.2016.08.121
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Within this work, we systematically investigate the influence of the amount of free carbon phase on the electrical conductivity and the lithium storage capability of silicon oxycarbide (SiOC) materials. A series of SiOC ceramics comprised of free carbon content ranging from 8 to 54 wt.% is examined. The ability to reversibly host lithium ions is correlated with the elemental composition and the electrical conductivity. The materials with low carbon content up to ∼20 wt.% reveal conductivities lower than 3 10−5 S m−1 and initially high capacities of more than 1000 mAh g−1, which fade rapidly with continuous cycling. For the samples with higher amounts of free carbon phase, higher electrical conductivities ranging from 0.07 to 2.2 S m−1 are measured. In comparison to the carbon-poor materials, the carbon-rich samples demonstrate enhanced accessibility of Li-ion storing sites with capacities of more than 500 mAh g−1. Moreover, a linear dependence between a stable capacity after 60 cycles and free carbon content in the ceramic is found.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Kaspar, Jan ; Graczyk-Zajac, Magdalena ; Choudhury, Soumyadip ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Impact of the electrical conductivity on the lithium capacity of polymer-derived silicon oxycarbide (SiOC) ceramics |
| Sprache: | Englisch |
| Publikationsjahr: | 20 Oktober 2016 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Electrochimica Acta |
| Jahrgang/Volume einer Zeitschrift: | 216 |
| DOI: | 10.1016/j.electacta.2016.08.121 |
| Kurzbeschreibung (Abstract): | Within this work, we systematically investigate the influence of the amount of free carbon phase on the electrical conductivity and the lithium storage capability of silicon oxycarbide (SiOC) materials. A series of SiOC ceramics comprised of free carbon content ranging from 8 to 54 wt.% is examined. The ability to reversibly host lithium ions is correlated with the elemental composition and the electrical conductivity. The materials with low carbon content up to ∼20 wt.% reveal conductivities lower than 3 10−5 S m−1 and initially high capacities of more than 1000 mAh g−1, which fade rapidly with continuous cycling. For the samples with higher amounts of free carbon phase, higher electrical conductivities ranging from 0.07 to 2.2 S m−1 are measured. In comparison to the carbon-poor materials, the carbon-rich samples demonstrate enhanced accessibility of Li-ion storing sites with capacities of more than 500 mAh g−1. Moreover, a linear dependence between a stable capacity after 60 cycles and free carbon content in the ceramic is found. |
| Freie Schlagworte: | Li-ion battery, polymer-derived SiOC, electrical conductivity, carbon content |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 04 Jan 2017 09:30 |
| Letzte Änderung: | 04 Jan 2017 09:30 |
| PPN: | |
| Sponsoren: | This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG), Germany within the priority program SPP1473/JP8. |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum