Pradeep, V. S. and Ayana, D. G. and Graczyk-Zajac, M. and Soraru, G. D. and Riedel, R. (2015):
High Rate Capability of SiOC Ceramic Aerogels with Tailored Porosity as Anode Materials for Li-ion Batteries.
In: Electrochimica Acta, Elsevier Science Publishing, pp. 41-45, 157, ISSN 00134686,
[Online-Edition: http://dx.doi.org/10.1016/j.electacta.2015.01.088],
[Article]
Abstract
Porous carbon-rich SiOC ceramic aerogels have been synthesized from a linear polysiloxane cross-linked with divinylbenzene (DVB) via hydrosilylation reaction in presence of a Pt catalyst and acetone as a solvent. The obtained wet gels are aged in solvent followed by drying under supercritical conditions using liquid carbon dioxide. The resulting pre-ceramic aerogels are subjected to pyrolysis at 1000 °C under controlled argon atmosphere to form the desired SiOC aerogel. The synthesized SiOC ceramics contain 43 wt% of free carbon, which is segregated within amorphous SiOC matrix. The high BET surface area up to 230 m2g−1 of preceramic aerogels is only slightly diminished to 180 m2g−1 after pyrolysis at 1000 °C. The electrochemical characterization reveals a high specific capacity of more than 600 mAh g−1 at a charging rate of C (360 mA g−1) along with a good cycling stability. At a rate of 10C (3600 mA g−1) the specific capacities as high as 200 mAh g−1 are recovered. The excellent properties of the materials are discussed with respect to their structural features. The porous nature of the carbon rich ceramics allows for fast ionic transport and helps to accommodate the structural changes which in turn allow a stable performance during repeated lithiation/delithiation.
| Item Type: | Article |
|---|---|
| Erschienen: | 2015 |
| Creators: | Pradeep, V. S. and Ayana, D. G. and Graczyk-Zajac, M. and Soraru, G. D. and Riedel, R. |
| Title: | High Rate Capability of SiOC Ceramic Aerogels with Tailored Porosity as Anode Materials for Li-ion Batteries |
| Language: | English |
| Abstract: | Porous carbon-rich SiOC ceramic aerogels have been synthesized from a linear polysiloxane cross-linked with divinylbenzene (DVB) via hydrosilylation reaction in presence of a Pt catalyst and acetone as a solvent. The obtained wet gels are aged in solvent followed by drying under supercritical conditions using liquid carbon dioxide. The resulting pre-ceramic aerogels are subjected to pyrolysis at 1000 °C under controlled argon atmosphere to form the desired SiOC aerogel. The synthesized SiOC ceramics contain 43 wt% of free carbon, which is segregated within amorphous SiOC matrix. The high BET surface area up to 230 m2g−1 of preceramic aerogels is only slightly diminished to 180 m2g−1 after pyrolysis at 1000 °C. The electrochemical characterization reveals a high specific capacity of more than 600 mAh g−1 at a charging rate of C (360 mA g−1) along with a good cycling stability. At a rate of 10C (3600 mA g−1) the specific capacities as high as 200 mAh g−1 are recovered. The excellent properties of the materials are discussed with respect to their structural features. The porous nature of the carbon rich ceramics allows for fast ionic transport and helps to accommodate the structural changes which in turn allow a stable performance during repeated lithiation/delithiation. |
| Journal or Publication Title: | Electrochimica Acta |
| Volume: | 157 |
| Publisher: | Elsevier Science Publishing |
| Uncontrolled Keywords: | Aerogels, Polymer Derived Ceramics, Li-ion Batteries, Supercritical, Porous Ceramics |
| 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: | 03 Feb 2015 08:59 |
| Official URL: | http://dx.doi.org/10.1016/j.electacta.2015.01.088 |
| Additional Information: | SFB 595 A4 |
| Identification Number: | doi:10.1016/j.electacta.2015.01.088 |
| Funders: | Financial support from the German Research Foundation within SFB 595/A4 and SPP 1473/JP8 programs is greatly acknowledged., RR, GDS and VSP acknowledge the financial support from the EU through the MC INT FUNEA, CT-264873. |
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