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Polymer-derived-SiCN ceramic/graphite composite as anode material with enhanced rate capability for lithium ion batteries

Graczyk-Zajac, M. and Fasel, Claudia and Riedel, Ralf (2011):
Polymer-derived-SiCN ceramic/graphite composite as anode material with enhanced rate capability for lithium ion batteries.
In: Journal of Power Sources, Elsevier Science Publishing, pp. 6412-6418, 196, (15), ISSN 03787753,
DOI: 10.1016/j.jpowsour.2011.03.076,
[Online-Edition: https://doi.org/10.1016/j.jpowsour.2011.03.076],
[Article]

Abstract

We report on a new composite material in view of its application as a negative electrode in lithium-ion batteries. A commercial preceramic polysilazane mixed with graphite in 1:1 weight ratio was transformed into a SiCN/graphite composite material through a pyrolytic polymer-to-ceramic conversion at three different temperatures, namely 950 °C, 1100 °C and 1300 °C. By means of Raman spectroscopy we found successive ordering of carbon clusters into nano-crystalline graphitic regions with increasing pyrolysis temperature. The reversible capacity of about 350 mAh g−1 was measured with constant current charging/discharging for the composite prepared at 1300 °C. For comparison pure graphite and pure polysilazane-derived SiCN ceramic were examined as reference materials. During fast charging and discharging the composite material demonstrates enhanced capacity and stability. Charging and discharging in half an hour lead to about 200 and 10 mAh g−1, for the composite annealed at 1300 °C and pure graphite, respectively. A clear dependence between the final material capacity and pyrolysis temperature is found and discussed with respect to possible application in batteries, i.e. practical discharging potential limit. The best results in terms of capacity recovered under 1 V and high rate capability were also obtained for samples synthesized at 1300 °C.

Item Type: Article
Erschienen: 2011
Creators: Graczyk-Zajac, M. and Fasel, Claudia and Riedel, Ralf
Title: Polymer-derived-SiCN ceramic/graphite composite as anode material with enhanced rate capability for lithium ion batteries
Language: English
Abstract:

We report on a new composite material in view of its application as a negative electrode in lithium-ion batteries. A commercial preceramic polysilazane mixed with graphite in 1:1 weight ratio was transformed into a SiCN/graphite composite material through a pyrolytic polymer-to-ceramic conversion at three different temperatures, namely 950 °C, 1100 °C and 1300 °C. By means of Raman spectroscopy we found successive ordering of carbon clusters into nano-crystalline graphitic regions with increasing pyrolysis temperature. The reversible capacity of about 350 mAh g−1 was measured with constant current charging/discharging for the composite prepared at 1300 °C. For comparison pure graphite and pure polysilazane-derived SiCN ceramic were examined as reference materials. During fast charging and discharging the composite material demonstrates enhanced capacity and stability. Charging and discharging in half an hour lead to about 200 and 10 mAh g−1, for the composite annealed at 1300 °C and pure graphite, respectively. A clear dependence between the final material capacity and pyrolysis temperature is found and discussed with respect to possible application in batteries, i.e. practical discharging potential limit. The best results in terms of capacity recovered under 1 V and high rate capability were also obtained for samples synthesized at 1300 °C.

Journal or Publication Title: Journal of Power Sources
Volume: 196
Number: 15
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Li-ion batteries, Anode, Graphite, SiCN ceramic
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: 18 Dec 2018 10:59
DOI: 10.1016/j.jpowsour.2011.03.076
Official URL: https://doi.org/10.1016/j.jpowsour.2011.03.076
Additional Information:

SFB 595/A4

Funders: We gratefully acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany (SFB 595/A4)., Thanks to Timcal Pty. Ltd. for supplying graphite material., R.R thanks the Fonds der Chemischen Industrie, Frankfurt, Germany for financial support.
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