Kaspar, Jan ; Graczyk-Zajac, Magdalena ; 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
doi: 10.1016/j.electacta.2013.https://doi.org/10.184
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Kaspar, Jan ; Graczyk-Zajac, Magdalena ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Determination of the chemical diffusion coefficient of Li-ions in carbon-rich silicon oxycarbide anodes by electro-analytical methods |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Januar 2014 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Electrochimica Acta |
| Jahrgang/Volume einer Zeitschrift: | 115 |
| DOI: | 10.1016/j.electacta.2013.https://doi.org/10.184 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | Li-ion diffusion coefficient, silicon oxycarbide anode, PITT, GITT, EIS |
| Zusätzliche Informationen: | SFB 595 A4 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 595: Elektrische Ermüdung > A - Synthese > Teilprojekt A4: Neue Funktionskeramiken durch Anionensubstitution in oxidischen Systemen 11 Fachbereich Material- und Geowissenschaften Zentrale Einrichtungen DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche DFG-Sonderforschungsbereiche (inkl. Transregio) |
| Hinterlegungsdatum: | 06 Dez 2013 10:29 |
| Letzte Änderung: | 07 Jul 2014 11:40 |
| PPN: | |
| Sponsoren: | 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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