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Carbon-rich SiOC anodes for lithium-ion batteries: Part II. Role of thermal cross-linking

Kaspar, Jan and Graczyk-Zajac, Magdalena and Riedel, Ralf (2012):
Carbon-rich SiOC anodes for lithium-ion batteries: Part II. Role of thermal cross-linking.
In: Solid State Ionics, Elsevier, ISSN 01672738, [Online-Edition: http://dx.doi.org/10.1016/j.ssi.2012.01.026],
[Article]

Abstract

This paper presents the study of lithium insertion into carbon-rich polymer-derived silicon oxycarbide (SiOC) ceramics, synthesized by a thermal treatment of commercially available polysiloxane at 400 °C, followed by pyrolysis at 1100 and 1300 °C. The investigated samples demonstrate a similar chemical composition and provide a high amount of free carbon as separate phase within their microstructure. XRD- and Raman-measurements led us to identify the free carbon phase as a mixture of disordered carbon, nano-crystalline graphite and graphene sheets. This advantageous composition offers a large variety of Li-Ion storage sites, providing high lithiation capacities and reliable cycling behavior. In particular the 1100 °C sample demonstrates a stable reversible capacity of 521 mAhg− 1 at a cycling current of 37 mAg− 1, which is significantly higher than the theoretical capacity of graphite. The inferior performance of the 1300 °C sample with 367 mAhg− 1 at 37 mAg− 1 is attributed to a changed microstructure, namely an increased carbon organization within the free carbon phase and SiC crystallization at this temperature. In both cases, the thermal cross-linking leads to much better electrochemical properties than observed for directly pyrolyzed samples.

Item Type: Article
Erschienen: 2012
Creators: Kaspar, Jan and Graczyk-Zajac, Magdalena and Riedel, Ralf
Title: Carbon-rich SiOC anodes for lithium-ion batteries: Part II. Role of thermal cross-linking
Language: English
Abstract:

This paper presents the study of lithium insertion into carbon-rich polymer-derived silicon oxycarbide (SiOC) ceramics, synthesized by a thermal treatment of commercially available polysiloxane at 400 °C, followed by pyrolysis at 1100 and 1300 °C. The investigated samples demonstrate a similar chemical composition and provide a high amount of free carbon as separate phase within their microstructure. XRD- and Raman-measurements led us to identify the free carbon phase as a mixture of disordered carbon, nano-crystalline graphite and graphene sheets. This advantageous composition offers a large variety of Li-Ion storage sites, providing high lithiation capacities and reliable cycling behavior. In particular the 1100 °C sample demonstrates a stable reversible capacity of 521 mAhg− 1 at a cycling current of 37 mAg− 1, which is significantly higher than the theoretical capacity of graphite. The inferior performance of the 1300 °C sample with 367 mAhg− 1 at 37 mAg− 1 is attributed to a changed microstructure, namely an increased carbon organization within the free carbon phase and SiC crystallization at this temperature. In both cases, the thermal cross-linking leads to much better electrochemical properties than observed for directly pyrolyzed samples.

Journal or Publication Title: Solid State Ionics
Publisher: Elsevier
Uncontrolled Keywords: Li-Ion battery, Anode, Silicon oxycarbide, SiOC, Polymer-derived ceramic, High capacity
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) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A4: Novel functional ceramics using anionic substitution in oxidic systems
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
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 02 Apr 2012 08:48
Official URL: http://dx.doi.org/10.1016/j.ssi.2012.01.026
Additional Information:

SFB 595 A4

Identification Number: doi:10.1016/j.ssi.2012.01.026
Funders: Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany within SPP1473 and SFB 595/A4 program
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