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Structural Design of Polymer-Derived SiOC Ceramic Aerogels for High-Rate Li Ion Storage Applications

Vallachira Warriam Sasikumar, Pradeep and Zera, Emanuele and Graczyk-Zajac, Magdalena and Riedel, Ralf and Soraru, Gian Domenico and Dunn, B. (2016):
Structural Design of Polymer-Derived SiOC Ceramic Aerogels for High-Rate Li Ion Storage Applications.
In: Journal of the American Ceramic Society, Wiley, pp. 2977-2983, 99, (9), ISSN 00027820,
[Online-Edition: http://dx.doi.org/10.1111/jace.14323],
[Article]

Abstract

SiOC ceramic aerogels with different porosity, pore size, and specific surface area have been synthesized through the polymer-derived ceramic route by modifying the synthesis parameters and the pyrolysis steps. Preceramic aerogels are prepared by cross-linking a linear polysiloxane with divinylbenzene (DVB) via hydrosilylation reaction in the presence of a Pt catalyst under highly diluted conditions. Acetone and cyclohexane are used as solvent in our study. Wet gels are subsequently supercritically dried with CO2 to get the final preceramic aerogels. The SiOC ceramic aerogels are obtained after a pyrolysis treatment at 900°C in two different atmospheres: pure Ar and H2 (3%)/Ar mixtures. The nature of the solvent has a profound influence of the aerogel microstructure in terms of porosity, pore size, and specific surface area. Synthesized SiOC ceramic aerogels have similar chemical compositions irrespective of processing conditions with ~40 wt% of free carbon distributed within remaining mixed SiOC matrix. The BET surface areas range from 215 m2/g for acetone samples to 80 m2/g for samples derived from cyclohexane solvent. The electrochemical characterization reveals a high specific reversible capacity of more than 900 mAh/g at a charging rate of C (360 mA/g) along with a good cycling stability. Samples pyrolyzed in H2/Ar atmosphere show a high reversible capacity of 200 mAh/g even at a high charging/discharging rate of 20 C. Initial capacities were recovered after whole cycling procedure indicating their structural stabilities resisting any kind of exfoliations.

Item Type: Article
Erschienen: 2016
Creators: Vallachira Warriam Sasikumar, Pradeep and Zera, Emanuele and Graczyk-Zajac, Magdalena and Riedel, Ralf and Soraru, Gian Domenico and Dunn, B.
Title: Structural Design of Polymer-Derived SiOC Ceramic Aerogels for High-Rate Li Ion Storage Applications
Language: English
Abstract:

SiOC ceramic aerogels with different porosity, pore size, and specific surface area have been synthesized through the polymer-derived ceramic route by modifying the synthesis parameters and the pyrolysis steps. Preceramic aerogels are prepared by cross-linking a linear polysiloxane with divinylbenzene (DVB) via hydrosilylation reaction in the presence of a Pt catalyst under highly diluted conditions. Acetone and cyclohexane are used as solvent in our study. Wet gels are subsequently supercritically dried with CO2 to get the final preceramic aerogels. The SiOC ceramic aerogels are obtained after a pyrolysis treatment at 900°C in two different atmospheres: pure Ar and H2 (3%)/Ar mixtures. The nature of the solvent has a profound influence of the aerogel microstructure in terms of porosity, pore size, and specific surface area. Synthesized SiOC ceramic aerogels have similar chemical compositions irrespective of processing conditions with ~40 wt% of free carbon distributed within remaining mixed SiOC matrix. The BET surface areas range from 215 m2/g for acetone samples to 80 m2/g for samples derived from cyclohexane solvent. The electrochemical characterization reveals a high specific reversible capacity of more than 900 mAh/g at a charging rate of C (360 mA/g) along with a good cycling stability. Samples pyrolyzed in H2/Ar atmosphere show a high reversible capacity of 200 mAh/g even at a high charging/discharging rate of 20 C. Initial capacities were recovered after whole cycling procedure indicating their structural stabilities resisting any kind of exfoliations.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 99
Number: 9
Publisher: Wiley
Uncontrolled Keywords: polymer precursor, porous materials, electrochemistry, aerogel/aerosol, silicon oxycarbide
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Jan 2017 13:09
Official URL: http://dx.doi.org/10.1111/jace.14323
Identification Number: doi:10.1111/jace.14323
Funders: Funded by German Research Foundation. Grant Numbers: SFB 595/A4, SPP 1473/JP8, Funded by EU. Grant Number: CT-264873
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