This title appears in the Scientific Report :
2019
Thin film electrolytes for all-solid-state lithium batteries by sputter deposition
Thin film electrolytes for all-solid-state lithium batteries by sputter deposition
Current battery research and development is focused on cells with high energy density as well as high inherent safety. One approach to reach both goals at the same time is a battery concept including a mixed cathode, a solid-state thin film electrolyte and a lithium metal anode. Lithium-stuffed garn...
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Personal Name(s): | Lobe, Sandra (Corresponding author) |
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Dellen, Christian / Windmüller, Anna / Tsai, Chih-Long / Möller, Sören / Sohn, Yoo Jung / Sebold, Doris / Finsterbusch, Martin / Fattakhova-Rohlfing, Dina / Uhlenbruck, Sven / Guillon, Olivier | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Imprint: |
2018
|
Conference: | Batterieforum Deutschland, Berlin (Germany), 2018-01-24 - 2018-01-26 |
Document Type: |
Poster |
Research Program: |
Electrochemical Storage |
Publikationsportal JuSER |
Current battery research and development is focused on cells with high energy density as well as high inherent safety. One approach to reach both goals at the same time is a battery concept including a mixed cathode, a solid-state thin film electrolyte and a lithium metal anode. Lithium-stuffed garnets, like Li7La3Zr2O12 (LLZ), are promising electrolyte materials due to their high ionic conductivity and chemical and electrochemical stability with Lithium and common cathode materials, e.g. LiCoO2. However, the co-sintering of garnets with cathode material is impeded by the low thermal stability of these mixtures (e.g. <700°C for LiCoO2, <600°C for 5 V lithium manganese based spinels). Well-defined interfaces can be obtained, when the electrolyte is processed via gas phase at significant lower temperatures than in co-sintering processes. In a previous study we showed that single-phase LLZ thin films with a Li-ion conductivity of 1.2x10-4 S cm-1 can be formed by a sputter deposition process at 700°C. However, this deposition temperature leads to interphase formation with the used substrate material.In order to avoid detrimental diffusion and reaction during deposition, our approach concentrates on the reduction of substrate temperature by careful adjustment of the process parameters. Furthermore, the microstructure of the thin films has to be optimized, so that the Li-ion conductivity can be maximized. Therefore, post-annealing in different atmospheres was applied, too. As a major result we will show the deposition of garnet-structured thin films at around 400°C. The integration of garnet electrolytes in all-solid-state lithium batteries is facilitated by this low deposition temperature. That means, even electrodes, that show a low thermal stability, like e.g. high-voltage spinel materials, could be used as substrate for deposition of garnet electrolytes. |