This title appears in the Scientific Report :
2015
Sputter deposited Li7La3Zr2O$_{12}$ as electrolyte for thin film cells
Sputter deposited Li7La3Zr2O$_{12}$ as electrolyte for thin film cells
Most commercial state-of-the-art batteries work with a liquid organic electrolyte which might cause safety problems due to an insufficient thermal and electrochemical stability. Replacing the liquid by a solid electrolyte is one approach to overcome these problems. Next to sulfides and phosphates, o...
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Personal Name(s): | Lobe, Sandra (Corresponding author) |
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Tsai, Chih-Long / Finsterbusch, Martin / Dellen, Christian / Uhlenbruck, Sven / Gehrke, Hans-Gregor / Guillon, Olivier | |
Contributing Institute: |
JARA-ENERGY; JARA-ENERGY Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Imprint: |
2015
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Conference: | 20th International Conference on Solid State Ionics, Keystone, CO (USA), 2015-06-14 - 2015-06-19 |
Document Type: |
Abstract |
Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Electrochemical Storage |
Publikationsportal JuSER |
Most commercial state-of-the-art batteries work with a liquid organic electrolyte which might cause safety problems due to an insufficient thermal and electrochemical stability. Replacing the liquid by a solid electrolyte is one approach to overcome these problems. Next to sulfides and phosphates, oxide compounds like the garnet-structured Li7La3Zr2O12 (LLZ) are promising materials for solid electrolytes. LLZ exists in two modifications, a tetragonal and a cubic, whereby the cubic high temperature phase shows a higher Li-ion conductivity (about 10-4 S/cm). Further advantageous properties of LLZ are its thermal (up to 1050°C) and electrochemical stability (up to 8V) which allows its usage with high-voltage electrodes or in batteries at elevated temperatures. Since the conductivity is two orders of magnitude lower compared to organic electrolytes the overall resistance can be lowered by reduction to a thin electrolyte layer in all-solid-state cells.R.f. magnetron sputter deposition is one approach to coat large substrate areas with LLZ electrolyte. In order to get crack-free, dense and single phase LLZ thin films, deposition parameters need to be adjusted carefully, which is shown by x-ray diffraction (XRD), secondary ion mass spectroscopy (SIMS) and scanning electron microscopy (SEM). In our study conductivities up to 10-6 S/cm are achieved for single phase cubic thin films. Furthermore, LLZ thin films were successfully integrated into all solid state cells, which are also characterized. |