Dibandjo, P. ; Graczyk-Zajac, M. ; Riedel, R. ; Pradeep, V. S. ; Soraru, G. D. (2012)
Lithium insertion into dense and porous carbon-rich polymer-derived SiOC ceramics.
In: Journal of the European Ceramic Society, 32 (10)
doi: 10.1016/j.jeurceramsoc.2012.03.010
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Two polymer-derived SiOC ceramics with different amount of carbon were synthesized either as dense or porous SiOC powders. The dense materials were produced up to a maximum temperature of 1400 °C and show a phase separated nanostructure consisting of SiO2-rich clusters, nanocrystalline SiC and nanocrystalline carbon phase. The corresponding porous materials were obtained by etching the silica phase of the dense SiOC with 20% HF solution. The electrochemical properties of the dense and porous SiOC ceramics in terms of lithium insertion/extraction were studied. Accordingly, the SiOC materials show a first lithium insertion capacity between 380 and 648 mAh g−1 followed by significantly lower extraction capacities between 102 and 272 mAh g−1. We consider the free carbon phase present in the ceramic as the major lithium intercalating agent. The porous samples show a stable electrochemical behavior up to 30 cycles while for the dense materials the efficiency drops to almost zero after 10 cycles.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Dibandjo, P. ; Graczyk-Zajac, M. ; Riedel, R. ; Pradeep, V. S. ; Soraru, G. D. |
| Art des Eintrags: | Bibliographie |
| Titel: | Lithium insertion into dense and porous carbon-rich polymer-derived SiOC ceramics |
| Sprache: | Englisch |
| Publikationsjahr: | August 2012 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 32 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1016/j.jeurceramsoc.2012.03.010 |
| Kurzbeschreibung (Abstract): | Two polymer-derived SiOC ceramics with different amount of carbon were synthesized either as dense or porous SiOC powders. The dense materials were produced up to a maximum temperature of 1400 °C and show a phase separated nanostructure consisting of SiO2-rich clusters, nanocrystalline SiC and nanocrystalline carbon phase. The corresponding porous materials were obtained by etching the silica phase of the dense SiOC with 20% HF solution. The electrochemical properties of the dense and porous SiOC ceramics in terms of lithium insertion/extraction were studied. Accordingly, the SiOC materials show a first lithium insertion capacity between 380 and 648 mAh g−1 followed by significantly lower extraction capacities between 102 and 272 mAh g−1. We consider the free carbon phase present in the ceramic as the major lithium intercalating agent. The porous samples show a stable electrochemical behavior up to 30 cycles while for the dense materials the efficiency drops to almost zero after 10 cycles. |
| Freie Schlagworte: | Li-ion battery, Anode, SiOC, Polymer-derived ceramic |
| Zusätzliche Informationen: | SFB 595 A4 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese > Teilprojekt A4: Neue Funktionskeramiken durch Anionensubstitution in oxidischen Systemen 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 26 Jun 2012 13:37 |
| Letzte Änderung: | 21 Mär 2013 08:55 |
| PPN: | |
| Sponsoren: | Research supported by the European Community, through a Marie Curie Research and Training Network “PolyCerNet” (http://www.ing.unitn.it/∼soraru//), MRTN-CT-019601., We gratefully acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany (SFB 595/A4). |
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