TU Darmstadt / ULB / TUbiblio

Electrochemical performance of DVB-modified SiOC and SiCN polymer-derived negative electrodes for lithium-ion batteries

Liu, Guanwei and Kaspar, Jan and Reinold, Lukas Mirko and Graczyk-Zajac, Magdalena and Riedel, Ralf (2013):
Electrochemical performance of DVB-modified SiOC and SiCN polymer-derived negative electrodes for lithium-ion batteries.
106, In: Electrochimica Acta, pp. 101-108, ISSN 00134686, [Online-Edition: http://dx.doi.org/10.1016/j.electacta.2013.05.064],
[Article]

Abstract

Chemical modification of commercially available polyorganosilazane (HTT1800) and polyorganosiloxane (Polyramic RD-684a) with divinylbenzene (DVB) is accomplished via hydrosilylation reaction. The incorporation of DVB leads to an increase of the free carbon amount after pyrolysis within the corresponding SiCN and SiOC ceramics. The modification is carried out with lower, equal and higher stoichiometric ratios of the Sisingle bondH to Cdouble bond; length as m-dashC groups present in the Si-based polymer and DVB. FTIR results indicate a complete consumption of the Sisingle bondH bonds in the case of the stoichiometric amount of DVB and polymer RD-684a, while for HTT1800 neither the stoichiometric ratio nor DVB excess leads to a complete consumption of the Sisingle bondH groups. For both SiCN and SiOC ceramics the carbon content is found to increase with the amount of DVB. However, the most significant increase in free carbon content is registered for SiCN samples, namely of ca. 40%. The carbon content changed from 9.9 wt.% in the pure HTT1800-derived material up to 49.3 wt.% for the SiCN ceramic obtained with the highest amount of DVB addition. Accordingly, Li-ion storage and therefore charge storage capacity are simultaneously increased, for the first cycle from 136 to 574 mAh g−1, while columbic efficiency is raised by 10% up to 60.4%.

Item Type: Article
Erschienen: 2013
Creators: Liu, Guanwei and Kaspar, Jan and Reinold, Lukas Mirko and Graczyk-Zajac, Magdalena and Riedel, Ralf
Title: Electrochemical performance of DVB-modified SiOC and SiCN polymer-derived negative electrodes for lithium-ion batteries
Language: English
Abstract:

Chemical modification of commercially available polyorganosilazane (HTT1800) and polyorganosiloxane (Polyramic RD-684a) with divinylbenzene (DVB) is accomplished via hydrosilylation reaction. The incorporation of DVB leads to an increase of the free carbon amount after pyrolysis within the corresponding SiCN and SiOC ceramics. The modification is carried out with lower, equal and higher stoichiometric ratios of the Sisingle bondH to Cdouble bond; length as m-dashC groups present in the Si-based polymer and DVB. FTIR results indicate a complete consumption of the Sisingle bondH bonds in the case of the stoichiometric amount of DVB and polymer RD-684a, while for HTT1800 neither the stoichiometric ratio nor DVB excess leads to a complete consumption of the Sisingle bondH groups. For both SiCN and SiOC ceramics the carbon content is found to increase with the amount of DVB. However, the most significant increase in free carbon content is registered for SiCN samples, namely of ca. 40%. The carbon content changed from 9.9 wt.% in the pure HTT1800-derived material up to 49.3 wt.% for the SiCN ceramic obtained with the highest amount of DVB addition. Accordingly, Li-ion storage and therefore charge storage capacity are simultaneously increased, for the first cycle from 136 to 574 mAh g−1, while columbic efficiency is raised by 10% up to 60.4%.

Journal or Publication Title: Electrochimica Acta
Volume: 106
Uncontrolled Keywords: Polymer-derived ceramics; Lithium ion battery; Silicon oxycarbide; Silicon carbonitride; Anode
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 > A - Synthesis > Subproject A4: Novel functional ceramics using anionic substitution in oxidic systems
11 Department of Materials and Earth Sciences > Material Science
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
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: 26 Jul 2013 09:24
Official URL: http://dx.doi.org/10.1016/j.electacta.2013.05.064
Additional Information:

SFB 595 A4

Identification Number: doi:10.1016/j.electacta.2013.05.064
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item