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Lithium containing silazanes as precursors for SiCN:Li ceramics—A potential material for electrochemical applications

Liebau-Kunzmann, Verena and Fasel, Claudia and Kolb, Robert and Riedel, Ralf (2006):
Lithium containing silazanes as precursors for SiCN:Li ceramics—A potential material for electrochemical applications.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 3897-3901, 26, (16), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2005.11.008],
[Article]

Abstract

Lithium containing silicon carbonitride ceramics (SiCN:Li) were synthesized via precursor-to-ceramic-transformation of Li-containing (poly)silazanes. The precursors were obtained by lithiation of the model compound 2,4,6-trimethyl-2,4,6-trivinylcyclotrisilazane and of a commercial poly(organosilazane) VL20® with n-butyllithium in different molar ratios. According to Raman spectroscopic measurements, lithiation takes place at the NH groups of the molecular organosilazane structure. If the amount of n-BuLi exceeds the stoichiometric amount of NH groups, addition of n-BuLi at the vinyl groups (attached as substituents at the Si atoms of the silazane) occurs. Thermal analysis coupled with in situ mass spectrometry evidenced the loss of methane and hydrogen as the main gaseous by-products formed during the precursor-to-ceramic-transformation. The ceramization process is completed at 1100 °C in argon and yielded Li-containing silicon carbonitride, SiCN:Li. X-ray powder diffraction revealed that the resulting SiCN:Li ceramics were basically amorphous and contained LiSi2N3 as a crystalline phase with increasing amount of Li. Possible applications of the new SiCN:Li ceramics are seen in the field of Li-ion batteries as alternative anode or solid electrolyte material.

Item Type: Article
Erschienen: 2006
Creators: Liebau-Kunzmann, Verena and Fasel, Claudia and Kolb, Robert and Riedel, Ralf
Title: Lithium containing silazanes as precursors for SiCN:Li ceramics—A potential material for electrochemical applications
Language: English
Abstract:

Lithium containing silicon carbonitride ceramics (SiCN:Li) were synthesized via precursor-to-ceramic-transformation of Li-containing (poly)silazanes. The precursors were obtained by lithiation of the model compound 2,4,6-trimethyl-2,4,6-trivinylcyclotrisilazane and of a commercial poly(organosilazane) VL20® with n-butyllithium in different molar ratios. According to Raman spectroscopic measurements, lithiation takes place at the NH groups of the molecular organosilazane structure. If the amount of n-BuLi exceeds the stoichiometric amount of NH groups, addition of n-BuLi at the vinyl groups (attached as substituents at the Si atoms of the silazane) occurs. Thermal analysis coupled with in situ mass spectrometry evidenced the loss of methane and hydrogen as the main gaseous by-products formed during the precursor-to-ceramic-transformation. The ceramization process is completed at 1100 °C in argon and yielded Li-containing silicon carbonitride, SiCN:Li. X-ray powder diffraction revealed that the resulting SiCN:Li ceramics were basically amorphous and contained LiSi2N3 as a crystalline phase with increasing amount of Li. Possible applications of the new SiCN:Li ceramics are seen in the field of Li-ion batteries as alternative anode or solid electrolyte material.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 26
Number: 16
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Silazanes, Batteries, SiCN/Li
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A4: Novel functional ceramics using anionic substitution in oxidic systems
Date Deposited: 04 Aug 2011 12:12
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2005.11.008
Additional Information:

SFB 595 A4

Identification Number: doi:10.1016/j.jeurceramsoc.2005.11.008
Funders: The authors would like to thank the Deutsche Forschungsgemeinschaft (DFG) for financial support., The present study is part of a DFG-Collaborative Research Center, the SFB 595 “Elektrische Ermüdung in Funktionswerkstoffen”.
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