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Determination of the chemical diffusion coefficient of Li-ions in carbon-rich silicon oxycarbide anodes by electro-analytical methods

Kaspar, Jan and Graczyk-Zajac, Magdalena and Riedel, Ralf (2014):
Determination of the chemical diffusion coefficient of Li-ions in carbon-rich silicon oxycarbide anodes by electro-analytical methods.
115, In: Electrochimica Acta, Elsevier Science Publishing, pp. 665-670, ISSN 00134686, [Online-Edition: http://dx.doi.org/10.1016/j.electacta.2013.10.184],
[Article]

Abstract

The diffusion coefficient of Li-ions (DLi+) within carbon-rich silicon-oxycarbide ceramic anodes of specific chemical composition SiO0.95C3.72 is determined by potentiostatic and galvanostatic intermittent titration technique (PITT, GITT) and electrochemical impedance spectroscopy (EIS). The estimated values for DLi+ range between 10−9 and 10−11 cm2 s−1, dependent on the applied method. The observed variation of DLi+ is in a comparable range as reported for disordered carbons, well reflecting the Li-ion storage in the segregated free carbon phase in the amount of about 43 wt-% within the SiOC microstructure. However, in contrast to graphite and disordered carbons, the diffusion coefficient of lithium within carbon-rich SiOC is less potential dependent. This feature is discussed with respect to the particular morphology of the free carbon phase.

Item Type: Article
Erschienen: 2014
Creators: Kaspar, Jan and Graczyk-Zajac, Magdalena and Riedel, Ralf
Title: Determination of the chemical diffusion coefficient of Li-ions in carbon-rich silicon oxycarbide anodes by electro-analytical methods
Language: English
Abstract:

The diffusion coefficient of Li-ions (DLi+) within carbon-rich silicon-oxycarbide ceramic anodes of specific chemical composition SiO0.95C3.72 is determined by potentiostatic and galvanostatic intermittent titration technique (PITT, GITT) and electrochemical impedance spectroscopy (EIS). The estimated values for DLi+ range between 10−9 and 10−11 cm2 s−1, dependent on the applied method. The observed variation of DLi+ is in a comparable range as reported for disordered carbons, well reflecting the Li-ion storage in the segregated free carbon phase in the amount of about 43 wt-% within the SiOC microstructure. However, in contrast to graphite and disordered carbons, the diffusion coefficient of lithium within carbon-rich SiOC is less potential dependent. This feature is discussed with respect to the particular morphology of the free carbon phase.

Journal or Publication Title: Electrochimica Acta
Volume: 115
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Li-ion diffusion coefficient, silicon oxycarbide anode, PITT, GITT, EIS
Divisions: 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
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
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 06 Dec 2013 10:29
Official URL: http://dx.doi.org/10.1016/j.electacta.2013.10.184
Additional Information:

SFB 595 A4

Identification Number: doi:10.1016/j.electacta.2013.10.184
Funders: This work was financially support by the Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany within the Priority Program SPP1473/JP8 and the Collaborative Research Center SFB595/A4.
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