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Influence of pyrolysis atmosphere on the lithium storage properties of carbon-rich polymer derived SiOC ceramic anodes

Pradeep, V. S. and Graczyk-Zajac, Magdalena and Wilamowska, Monika and Riedel, Ralf and Sorarù, Gian D. (2014):
Influence of pyrolysis atmosphere on the lithium storage properties of carbon-rich polymer derived SiOC ceramic anodes.
In: Solid State Ionics, Elsevier Science Publishing, pp. 22-24, 262, ISSN 01672738,
[Online-Edition: http://dx.doi.org/10.1016/j.ssi.2013.08.043],
[Article]

Abstract

Polymer derived carbon-rich SiOC ceramics are prepared from polysiloxane precursors through a pyrolysis process at 1000 °C using pure argon and argon/hydrogen mixture as pyrolysis atmosphere. The precursor is synthesized from a linear (Si–H)-containing polysiloxane cross-linked with divinylbenzene using hydrosilylation reaction in the presence of a platinum catalyst. Pyrolysis in Ar/H2 mixtures, compared to the treatment under pure Ar, results into a decrease of the concentration of C dangling bonds as revealed by electron spin resonance (ESR) measurements. The amount of free carbon phase is 10 wt.% lower in the sample pyrolysed in a Ar/H2 mixture, while the ratio of hydrogen to free carbon remains constant for both, in Ar and in Ar/H2 pyrolysed samples. The sample prepared under Ar/H2 mixture shows an excellent cycling stability with an increase in the specific capacity of about 150 mAhg− 1 compared to its analogues pyrolysed in pure argon atmosphere.

Item Type: Article
Erschienen: 2014
Creators: Pradeep, V. S. and Graczyk-Zajac, Magdalena and Wilamowska, Monika and Riedel, Ralf and Sorarù, Gian D.
Title: Influence of pyrolysis atmosphere on the lithium storage properties of carbon-rich polymer derived SiOC ceramic anodes
Language: English
Abstract:

Polymer derived carbon-rich SiOC ceramics are prepared from polysiloxane precursors through a pyrolysis process at 1000 °C using pure argon and argon/hydrogen mixture as pyrolysis atmosphere. The precursor is synthesized from a linear (Si–H)-containing polysiloxane cross-linked with divinylbenzene using hydrosilylation reaction in the presence of a platinum catalyst. Pyrolysis in Ar/H2 mixtures, compared to the treatment under pure Ar, results into a decrease of the concentration of C dangling bonds as revealed by electron spin resonance (ESR) measurements. The amount of free carbon phase is 10 wt.% lower in the sample pyrolysed in a Ar/H2 mixture, while the ratio of hydrogen to free carbon remains constant for both, in Ar and in Ar/H2 pyrolysed samples. The sample prepared under Ar/H2 mixture shows an excellent cycling stability with an increase in the specific capacity of about 150 mAhg− 1 compared to its analogues pyrolysed in pure argon atmosphere.

Journal or Publication Title: Solid State Ionics
Volume: 262
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Li-ion batteries; Anodes; Polymer derived ceramics; SiOC
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
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
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 01 Jul 2014 08:45
Official URL: http://dx.doi.org/10.1016/j.ssi.2013.08.043
Additional Information:

SFB 595 A4 Solid State Ionics 19 Proceedings of the 19th International Conference on Solid State Ionics

Identification Number: doi:10.1016/j.ssi.2013.08.043
Funders: Financial support from the German Science Foundation within SFB 595/A4 program is acknowledged. , The authors thank Jan Kaspar for the elemental analysis measurements and Dr. Emanuela Callone for the ESR measurements., G.D. Soraru and V.S. Pradeep acknowledge the financial support from the EU through the MC INT FUNEA, CT-264873.
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