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| Home > Publications database > Thin film deposition of garnet electrolytes for batteries with high energy density |
| Poster (After Call) | FZJ-2019-00947 |
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2018
Abstract: Nowadays, important research topics in the field of batteries are high energy densities as well as high inherent safety of the battery cells. Ceramic solid electrolytes are one possibility to reach both goals in one cell. Safety is given by the chemical and thermal stability of the ceramics. High energy density can be obtained by cells with higher voltages and/ or higher capacities, for example by using lithium metal as anode material and cathode active materials with potentials higher than 4.5 V vs. lithium metal. Garnet electrolytes based on the composition Li7-xLa3Zr2-xTaxO12 show an excellent stability in contact with lithium metal and resist voltages of more than 5 V. Applied as a thin film, high gravimetric and volumetric energy densities can be achieved. In recent years different techniques were used for garnet thin film deposition, like sputtering, pulsed laser deposition, chemical vapor deposition and wet-chemical methods. However, a full cell with a garnet-structured thin film electrolyte was not shown yet. In this presentation we will discuss the challenges which are linked to garnet thin film deposition. The discussion will be based on our experiences from experimental work with sputter deposition supplemented by results from other methods. We will show characteristic examples of different deposition parameters; especially the substrate material and the deposition temperature will be addressed. Furthermore, the influence of post-annealing on the thin films will be discussed. The thin films are analyzed regarding their chemical and electrochemical properties, e.g. by X-ray diffraction, µ-Raman spectroscopy, scanning electron microscopy and electrochemical impedance spectroscopy.
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