Botros, Miriam and Djenadic, Ruzica and Clemens, Oliver and Möller, Matthias and Hahn, Horst (2016):
Field assisted sintering of fine-grained Li7−3xLa3Zr2AlxO12 solid electrolyte and the influence of the microstructure on the electrochemical performance.
In: Journal of Power Sources, 309, pp. 108-115. Elsevier Science Publishing, ISSN 03787753,
DOI: 10.1016/j.jpowsour.2016.01.086,
[Article]
Abstract
The synthesis and processing of fine-grained Li7−3xLa3Zr2AlxO12 (x = 0.15, 0.17, 0.20) solid electrolyte (LLZO) is performed for the first time using a combination of nebulized spray pyrolysis (NSP) and field assisted sintering technique (FAST). Using FAST, the grain growth is suppressed and highly dense ceramics with 93% of the theoretical density are obtained. A tetragonal lattice distortion is observed after the sintering process. Although this structural modification has been reported to have lower Li-ion mobility compared to the cubic modification, the total conductivity of the sample at room temperature is found to be 0.33 mS cm−1, i.e. comparable to phase-pure cubic LLZO. The activation energy of 0.38 eV is also comparable to the literature values. Galvanostatic cycling of a symmetrical cell Li|LLZO|Li shows a good cycling stability over 100 h. The interfacial resistance in contact with Li-metal is determined using alternating current impedance spectroscopy to be 76 Ω cm2 and 69 Ω cm2 before and after cycling at different current densities, respectively.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Botros, Miriam and Djenadic, Ruzica and Clemens, Oliver and Möller, Matthias and Hahn, Horst |
| Title: | Field assisted sintering of fine-grained Li7−3xLa3Zr2AlxO12 solid electrolyte and the influence of the microstructure on the electrochemical performance |
| Language: | English |
| Abstract: | The synthesis and processing of fine-grained Li7−3xLa3Zr2AlxO12 (x = 0.15, 0.17, 0.20) solid electrolyte (LLZO) is performed for the first time using a combination of nebulized spray pyrolysis (NSP) and field assisted sintering technique (FAST). Using FAST, the grain growth is suppressed and highly dense ceramics with 93% of the theoretical density are obtained. A tetragonal lattice distortion is observed after the sintering process. Although this structural modification has been reported to have lower Li-ion mobility compared to the cubic modification, the total conductivity of the sample at room temperature is found to be 0.33 mS cm−1, i.e. comparable to phase-pure cubic LLZO. The activation energy of 0.38 eV is also comparable to the literature values. Galvanostatic cycling of a symmetrical cell Li|LLZO|Li shows a good cycling stability over 100 h. The interfacial resistance in contact with Li-metal is determined using alternating current impedance spectroscopy to be 76 Ω cm2 and 69 Ω cm2 before and after cycling at different current densities, respectively. |
| Journal or Publication Title: | Journal of Power Sources |
| Journal volume: | 309 |
| Publisher: | Elsevier Science Publishing |
| Uncontrolled Keywords: | All-solid-state Li-ion battery, Garnet, Solid electrolyte, Microstructure, Spark plasma sintering, Interfacial resistance |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials |
| Date Deposited: | 12 Apr 2017 12:15 |
| DOI: | 10.1016/j.jpowsour.2016.01.086 |
| Official URL: | https://doi.org/10.1016/j.jpowsour.2016.01.086 |
| Funders: | The authors would like to thank Helmholtz Association (Germany) for financial support through the Helmholtz Portfolio Project “Electrochemical Storage in Systems - Reliability and Integration”. |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Send an inquiry |
Options (only for editors)
 |
Show editorial Details |
Drucken
Impressum