Pradeep, V. S. ; Ayana, D. G. ; Graczyk-Zajac, M. ; Soraru, G. D. ; Riedel, R. (2015)
High Rate Capability of SiOC Ceramic Aerogels with Tailored Porosity as Anode Materials for Li-ion Batteries.
In: Electrochimica Acta, 157
doi: 10.1016/j.electacta.2015.01.088
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Porous carbon-rich SiOC ceramic aerogels have been synthesized from a linear polysiloxane cross-linked with divinylbenzene (DVB) via hydrosilylation reaction in presence of a Pt catalyst and acetone as a solvent. The obtained wet gels are aged in solvent followed by drying under supercritical conditions using liquid carbon dioxide. The resulting pre-ceramic aerogels are subjected to pyrolysis at 1000 °C under controlled argon atmosphere to form the desired SiOC aerogel. The synthesized SiOC ceramics contain 43 wt% of free carbon, which is segregated within amorphous SiOC matrix. The high BET surface area up to 230 m2g−1 of preceramic aerogels is only slightly diminished to 180 m2g−1 after pyrolysis at 1000 °C. The electrochemical characterization reveals a high specific capacity of more than 600 mAh g−1 at a charging rate of C (360 mA g−1) along with a good cycling stability. At a rate of 10C (3600 mA g−1) the specific capacities as high as 200 mAh g−1 are recovered. The excellent properties of the materials are discussed with respect to their structural features. The porous nature of the carbon rich ceramics allows for fast ionic transport and helps to accommodate the structural changes which in turn allow a stable performance during repeated lithiation/delithiation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Pradeep, V. S. ; Ayana, D. G. ; Graczyk-Zajac, M. ; Soraru, G. D. ; Riedel, R. |
| Art des Eintrags: | Bibliographie |
| Titel: | High Rate Capability of SiOC Ceramic Aerogels with Tailored Porosity as Anode Materials for Li-ion Batteries |
| Sprache: | Englisch |
| Publikationsjahr: | 1 März 2015 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Electrochimica Acta |
| Jahrgang/Volume einer Zeitschrift: | 157 |
| DOI: | 10.1016/j.electacta.2015.01.088 |
| Kurzbeschreibung (Abstract): | Porous carbon-rich SiOC ceramic aerogels have been synthesized from a linear polysiloxane cross-linked with divinylbenzene (DVB) via hydrosilylation reaction in presence of a Pt catalyst and acetone as a solvent. The obtained wet gels are aged in solvent followed by drying under supercritical conditions using liquid carbon dioxide. The resulting pre-ceramic aerogels are subjected to pyrolysis at 1000 °C under controlled argon atmosphere to form the desired SiOC aerogel. The synthesized SiOC ceramics contain 43 wt% of free carbon, which is segregated within amorphous SiOC matrix. The high BET surface area up to 230 m2g−1 of preceramic aerogels is only slightly diminished to 180 m2g−1 after pyrolysis at 1000 °C. The electrochemical characterization reveals a high specific capacity of more than 600 mAh g−1 at a charging rate of C (360 mA g−1) along with a good cycling stability. At a rate of 10C (3600 mA g−1) the specific capacities as high as 200 mAh g−1 are recovered. The excellent properties of the materials are discussed with respect to their structural features. The porous nature of the carbon rich ceramics allows for fast ionic transport and helps to accommodate the structural changes which in turn allow a stable performance during repeated lithiation/delithiation. |
| Freie Schlagworte: | Aerogels, Polymer Derived Ceramics, Li-ion Batteries, Supercritical, Porous Ceramics |
| 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: | 03 Feb 2015 08:59 |
| Letzte Änderung: | 27 Feb 2015 10:40 |
| PPN: | |
| Sponsoren: | Financial support from the German Research Foundation within SFB 595/A4 and SPP 1473/JP8 programs is greatly acknowledged., RR, GDS and VSP acknowledge the financial support from the EU through the MC INT FUNEA, CT-264873. |
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