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Lithium insertion into dense and porous carbon-rich polymer-derived SiOC ceramics

Dibandjo, P. and Graczyk-Zajac, M. and Riedel, R. and Pradeep, V. S. and Soraru, G. D. (2012):
Lithium insertion into dense and porous carbon-rich polymer-derived SiOC ceramics.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 2495-2503, 32, (10), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2012.03.010],
[Article]

Abstract

Two polymer-derived SiOC ceramics with different amount of carbon were synthesized either as dense or porous SiOC powders. The dense materials were produced up to a maximum temperature of 1400 °C and show a phase separated nanostructure consisting of SiO2-rich clusters, nanocrystalline SiC and nanocrystalline carbon phase. The corresponding porous materials were obtained by etching the silica phase of the dense SiOC with 20% HF solution. The electrochemical properties of the dense and porous SiOC ceramics in terms of lithium insertion/extraction were studied. Accordingly, the SiOC materials show a first lithium insertion capacity between 380 and 648 mAh g−1 followed by significantly lower extraction capacities between 102 and 272 mAh g−1. We consider the free carbon phase present in the ceramic as the major lithium intercalating agent. The porous samples show a stable electrochemical behavior up to 30 cycles while for the dense materials the efficiency drops to almost zero after 10 cycles.

Item Type: Article
Erschienen: 2012
Creators: Dibandjo, P. and Graczyk-Zajac, M. and Riedel, R. and Pradeep, V. S. and Soraru, G. D.
Title: Lithium insertion into dense and porous carbon-rich polymer-derived SiOC ceramics
Language: English
Abstract:

Two polymer-derived SiOC ceramics with different amount of carbon were synthesized either as dense or porous SiOC powders. The dense materials were produced up to a maximum temperature of 1400 °C and show a phase separated nanostructure consisting of SiO2-rich clusters, nanocrystalline SiC and nanocrystalline carbon phase. The corresponding porous materials were obtained by etching the silica phase of the dense SiOC with 20% HF solution. The electrochemical properties of the dense and porous SiOC ceramics in terms of lithium insertion/extraction were studied. Accordingly, the SiOC materials show a first lithium insertion capacity between 380 and 648 mAh g−1 followed by significantly lower extraction capacities between 102 and 272 mAh g−1. We consider the free carbon phase present in the ceramic as the major lithium intercalating agent. The porous samples show a stable electrochemical behavior up to 30 cycles while for the dense materials the efficiency drops to almost zero after 10 cycles.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 32
Number: 10
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Li-ion battery, Anode, SiOC, Polymer-derived ceramic
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: 26 Jun 2012 13:37
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2012.03.010
Additional Information:

SFB 595 A4

Identification Number: doi:10.1016/j.jeurceramsoc.2012.03.010
Funders: Research supported by the European Community, through a Marie Curie Research and Training Network “PolyCerNet” (http://www.ing.unitn.it/∼soraru//), MRTN-CT-019601., We gratefully acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany (SFB 595/A4).
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