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.
In: Electrochimica Acta, 115, pp. 665-670. Elsevier Science Publishing, ISSN 00134686,
[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 |
| Journal 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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