Li7La3Zr2O12 solid electrolyte sintered by the ultrafast high-temperature method |
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Authors: | Martin Ihrig Tarini Prasad Mishra Walter Sebastian Scheld Grit Häuschen Wolfgang Rheinheimer Martin Bram Martin Finsterbusch Olivier Guillon |
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Affiliation: | 1. Institute of Energy and Climate Research – Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany;2. Institute of Mineral Engineering, RWTH Aachen University, Mauerstr. 5, 52064, Aachen, Germany;3. Helmholtz Institute Münster: Ionics in Energy Storage, Corrensstr. 46, 48149 Münster, Germany |
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Abstract: | All-solid-state Li batteries (ASSLBs) are regarded as the systems of choice for future electrochemical energy storage. Particularly, the garnet Li7La3Zr2O12 (LLZO) is one of the most promising solid electrolytes due to its stability against Li metal. However, its integration into ASSLBs is challenging due to high temperature and long dwell time required for sintering. Advanced sintering techniques, such as Ultrafast High-temperature Sintering, have shown to significantly increase the sintering rate. Direct contact to graphite heaters allows sintering of LLZO within 10 s due to extremely high heating rates (up to 104 K min?1) and temperatures up to 1500 °C to a density around 80 %. The LLZO sintered in vacuum and Ar atmosphere has good mechanical stability and high phase purity, but kinetic de-mixing at the grain boundaries was observed. Nevertheless, the Li-ion conductivity of 1 mS cm?1 at 80 °C was comparable to conventional sintering, but lower than for Field-Assisted Sintering Technique/Spark Plasma Sintering. |
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Keywords: | Ultrafast high-temperature sintering LLZO Phase analysis Microstructure Impedance |
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