Kaspar, Jan ; Graczyk-Zajac, Magdalena ; Riedel, Ralf (2012)
Carbon-rich SiOC anodes for lithium-ion batteries: Part II. Role of thermal cross-linking.
In: Solid State Ionics
doi: 10.1016/j.ssi.2012.01.026
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
This paper presents the study of lithium insertion into carbon-rich polymer-derived silicon oxycarbide (SiOC) ceramics, synthesized by a thermal treatment of commercially available polysiloxane at 400 °C, followed by pyrolysis at 1100 and 1300 °C. The investigated samples demonstrate a similar chemical composition and provide a high amount of free carbon as separate phase within their microstructure. XRD- and Raman-measurements led us to identify the free carbon phase as a mixture of disordered carbon, nano-crystalline graphite and graphene sheets. This advantageous composition offers a large variety of Li-Ion storage sites, providing high lithiation capacities and reliable cycling behavior. In particular the 1100 °C sample demonstrates a stable reversible capacity of 521 mAhg− 1 at a cycling current of 37 mAg− 1, which is significantly higher than the theoretical capacity of graphite. The inferior performance of the 1300 °C sample with 367 mAhg− 1 at 37 mAg− 1 is attributed to a changed microstructure, namely an increased carbon organization within the free carbon phase and SiC crystallization at this temperature. In both cases, the thermal cross-linking leads to much better electrochemical properties than observed for directly pyrolyzed samples.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Kaspar, Jan ; Graczyk-Zajac, Magdalena ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Carbon-rich SiOC anodes for lithium-ion batteries: Part II. Role of thermal cross-linking |
| Sprache: | Englisch |
| Publikationsjahr: | 2012 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Solid State Ionics |
| DOI: | 10.1016/j.ssi.2012.01.026 |
| Kurzbeschreibung (Abstract): | This paper presents the study of lithium insertion into carbon-rich polymer-derived silicon oxycarbide (SiOC) ceramics, synthesized by a thermal treatment of commercially available polysiloxane at 400 °C, followed by pyrolysis at 1100 and 1300 °C. The investigated samples demonstrate a similar chemical composition and provide a high amount of free carbon as separate phase within their microstructure. XRD- and Raman-measurements led us to identify the free carbon phase as a mixture of disordered carbon, nano-crystalline graphite and graphene sheets. This advantageous composition offers a large variety of Li-Ion storage sites, providing high lithiation capacities and reliable cycling behavior. In particular the 1100 °C sample demonstrates a stable reversible capacity of 521 mAhg− 1 at a cycling current of 37 mAg− 1, which is significantly higher than the theoretical capacity of graphite. The inferior performance of the 1300 °C sample with 367 mAhg− 1 at 37 mAg− 1 is attributed to a changed microstructure, namely an increased carbon organization within the free carbon phase and SiC crystallization at this temperature. In both cases, the thermal cross-linking leads to much better electrochemical properties than observed for directly pyrolyzed samples. |
| Freie Schlagworte: | Li-Ion battery, Anode, Silicon oxycarbide, SiOC, Polymer-derived ceramic, High capacity |
| Zusätzliche Informationen: | SFB 595 A4 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese > Teilprojekt A4: Neue Funktionskeramiken durch Anionensubstitution in oxidischen Systemen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 02 Apr 2012 08:48 |
| Letzte Änderung: | 05 Mär 2013 10:00 |
| PPN: | |
| Sponsoren: | Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany within SPP1473 and SFB 595/A4 program |
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