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Tailoring of SiOC composition as a way to better performing anodes for Li-ion batteries

Wilamowska, Monika and Pradeep, V. S. and Graczyk-Zajac, Magdalena and Riedel, Ralf and Sorarù, Gian Domenico (2014):
Tailoring of SiOC composition as a way to better performing anodes for Li-ion batteries.
In: Solid State Ionics, Elsevier Science Publishing, pp. 94-100, 260, ISSN 01672738,
[Online-Edition: http://dx.doi.org/10.1016/j.ssi.2014.03.021],
[Article]

Abstract

Polymer derived silicon oxycarbide (SiOC) ceramics are investigated as potential anodes for lithium ion batteries. Different SiOC ceramics are prepared by pyrolysis (1000 °C and 1400 °C under controlled argon atmosphere) of polysiloxanes ceramic precursors. Preceramic polymers are synthesized using the sol–gel method. Phenyltriethoxysilane (PhTES) and methyltriethoxysilane (MTES) have been used as starting precursors and mixed with different ratios in order to tailor the chemical composition and the structure of the final product. The obtained SiOC ceramics are amorphous with various content of free carbon phase (from approx. 25 to 40 wt.%). The presence of disordered carbons in the ceramic structure is confirmed by the appearance of a well pronounced D band at 1330 cm− 1 in the Raman spectra. Additionally, 29Si MAS-NMR spectra show the presence, in the structure of the materials pyrolysed at 1000 °C, of mixed bond tetrahedra such as: SiO3C, SiO2C2, SiOC3 and SiO4 units. Pyrolysis at an elevated temperature (1400 °C) promotes the phase separation into oxygen rich (SiO4) and carbon rich (SiC4) units with consumption of mixed bonds. Carbon rich SiOC samples exhibit significant reversible capacity and enhanced cycling stability (up to 600 mAh g− 1 measured at a slow current rate of C/20 after 140 cycles of continuous charging–discharging with increasing current density). However, the high irreversible capacity of the first few cycles remains an issue to be solved.

Item Type: Article
Erschienen: 2014
Creators: Wilamowska, Monika and Pradeep, V. S. and Graczyk-Zajac, Magdalena and Riedel, Ralf and Sorarù, Gian Domenico
Title: Tailoring of SiOC composition as a way to better performing anodes for Li-ion batteries
Language: English
Abstract:

Polymer derived silicon oxycarbide (SiOC) ceramics are investigated as potential anodes for lithium ion batteries. Different SiOC ceramics are prepared by pyrolysis (1000 °C and 1400 °C under controlled argon atmosphere) of polysiloxanes ceramic precursors. Preceramic polymers are synthesized using the sol–gel method. Phenyltriethoxysilane (PhTES) and methyltriethoxysilane (MTES) have been used as starting precursors and mixed with different ratios in order to tailor the chemical composition and the structure of the final product. The obtained SiOC ceramics are amorphous with various content of free carbon phase (from approx. 25 to 40 wt.%). The presence of disordered carbons in the ceramic structure is confirmed by the appearance of a well pronounced D band at 1330 cm− 1 in the Raman spectra. Additionally, 29Si MAS-NMR spectra show the presence, in the structure of the materials pyrolysed at 1000 °C, of mixed bond tetrahedra such as: SiO3C, SiO2C2, SiOC3 and SiO4 units. Pyrolysis at an elevated temperature (1400 °C) promotes the phase separation into oxygen rich (SiO4) and carbon rich (SiC4) units with consumption of mixed bonds. Carbon rich SiOC samples exhibit significant reversible capacity and enhanced cycling stability (up to 600 mAh g− 1 measured at a slow current rate of C/20 after 140 cycles of continuous charging–discharging with increasing current density). However, the high irreversible capacity of the first few cycles remains an issue to be solved.

Journal or Publication Title: Solid State Ionics
Volume: 260
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Silicon oxycarbide; Anode materials; Lithium ion batteries; Sol–gel synthesis
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: 03 Jun 2014 10:45
Official URL: http://dx.doi.org/10.1016/j.ssi.2014.03.021
Additional Information:

SFB 595 A4

Identification Number: doi:10.1016/j.ssi.2014.03.021
Funders: This work is supported by the Foundation for Polish Science under grant HOMING PLUS/2012-6/16. , MGZ, RR, and VSP acknowledge the support of the German Science Foundation (SFB 595). VSP and GDS acknowledge the financial contribution from the EU and MC-ITN FUNEA. , The authors also acknowledge C. Fasel (TGA) and J. Kaspar (elemental analysis) for their support throughout the individual measurements.
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