Liu, Guanwei ; Kaspar, Jan ; Reinold, Lukas Mirko ; Graczyk-Zajac, Magdalena ; Riedel, Ralf (2013)
Electrochemical performance of DVB-modified SiOC and SiCN polymer-derived negative electrodes for lithium-ion batteries.
In: Electrochimica Acta, 106
doi: 10.1016/j.electacta.2013.05.064
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Chemical modification of commercially available polyorganosilazane (HTT1800) and polyorganosiloxane (Polyramic RD-684a) with divinylbenzene (DVB) is accomplished via hydrosilylation reaction. The incorporation of DVB leads to an increase of the free carbon amount after pyrolysis within the corresponding SiCN and SiOC ceramics. The modification is carried out with lower, equal and higher stoichiometric ratios of the Sisingle bondH to Cdouble bond; length as m-dashC groups present in the Si-based polymer and DVB. FTIR results indicate a complete consumption of the Sisingle bondH bonds in the case of the stoichiometric amount of DVB and polymer RD-684a, while for HTT1800 neither the stoichiometric ratio nor DVB excess leads to a complete consumption of the Sisingle bondH groups. For both SiCN and SiOC ceramics the carbon content is found to increase with the amount of DVB. However, the most significant increase in free carbon content is registered for SiCN samples, namely of ca. 40%. The carbon content changed from 9.9 wt.% in the pure HTT1800-derived material up to 49.3 wt.% for the SiCN ceramic obtained with the highest amount of DVB addition. Accordingly, Li-ion storage and therefore charge storage capacity are simultaneously increased, for the first cycle from 136 to 574 mAh g−1, while columbic efficiency is raised by 10% up to 60.4%.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Liu, Guanwei ; Kaspar, Jan ; Reinold, Lukas Mirko ; Graczyk-Zajac, Magdalena ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Electrochemical performance of DVB-modified SiOC and SiCN polymer-derived negative electrodes for lithium-ion batteries |
| Sprache: | Englisch |
| Publikationsjahr: | 1 September 2013 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Electrochimica Acta |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| DOI: | 10.1016/j.electacta.2013.05.064 |
| Kurzbeschreibung (Abstract): | Chemical modification of commercially available polyorganosilazane (HTT1800) and polyorganosiloxane (Polyramic RD-684a) with divinylbenzene (DVB) is accomplished via hydrosilylation reaction. The incorporation of DVB leads to an increase of the free carbon amount after pyrolysis within the corresponding SiCN and SiOC ceramics. The modification is carried out with lower, equal and higher stoichiometric ratios of the Sisingle bondH to Cdouble bond; length as m-dashC groups present in the Si-based polymer and DVB. FTIR results indicate a complete consumption of the Sisingle bondH bonds in the case of the stoichiometric amount of DVB and polymer RD-684a, while for HTT1800 neither the stoichiometric ratio nor DVB excess leads to a complete consumption of the Sisingle bondH groups. For both SiCN and SiOC ceramics the carbon content is found to increase with the amount of DVB. However, the most significant increase in free carbon content is registered for SiCN samples, namely of ca. 40%. The carbon content changed from 9.9 wt.% in the pure HTT1800-derived material up to 49.3 wt.% for the SiCN ceramic obtained with the highest amount of DVB addition. Accordingly, Li-ion storage and therefore charge storage capacity are simultaneously increased, for the first cycle from 136 to 574 mAh g−1, while columbic efficiency is raised by 10% up to 60.4%. |
| Freie Schlagworte: | Polymer-derived ceramics; Lithium ion battery; Silicon oxycarbide; Silicon carbonitride; Anode |
| 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 > A - Synthese > Teilprojekt A4: Neue Funktionskeramiken durch Anionensubstitution in oxidischen Systemen 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung 11 Fachbereich Material- und Geowissenschaften Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 26 Jul 2013 09:24 |
| Letzte Änderung: | 26 Jul 2013 09:24 |
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