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
All-solid-state lithium batteries can outperform the energy densities of state-of-the-art Li-ion batteries with liquid electrolyte if the electrolyte is applied as a thin film. Promising electrolyte materials are garnet-structured oxides like Li7La3Zr2O12 due to their high ionic conductivity and the...
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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: | Kraftwerk Batterie, Münster (Germany), 2018-04-10 - 2018-04-11 |
Document Type: |
Poster |
Research Program: |
Electrochemical Storage |
Publikationsportal JuSER |
All-solid-state lithium batteries can outperform the energy densities of state-of-the-art Li-ion batteries with liquid electrolyte if the electrolyte is applied as a thin film. Promising electrolyte materials are garnet-structured oxides like Li7La3Zr2O12 due to their high ionic conductivity and their high chemical and electrochemical stability with lithium metal anodes as well as different cathode materials. Considerations about thermodynamic stabilities play an important role during ceramic processing and thin film manufacturing. Most cathode materials react at comparatively low temperature (<600°C-700°C) with garnet materials. Thus, this critical temperature must not be exceeded during deposition. Furthermore, diffusion of elements from the substrate into the thin film and vice versa has to be avoided. Therefore, garnet thin films were already synthesized by different groups with different wet-chemical as well as chemical and physical vapor deposition methods. Nevertheless, complete thin film batteries with garnet electrolyte were not realized yet. In this presentation we show how material optimization and thin film processing of garnet materials can alleviate the problems concerning the high reactivity of the components. All thin films were made by radio frequency sputter deposition. An important key parameter is the substrate temperature during the deposition process which has to be adjusted carefully in order to optimize the electrochemical properties of the deposited thin films on a particular substrate. The Li-ion conductivity of the thin films is highly influenced by the microstructure and thus by the growth mechanism of the thin film. Therefore, the substrate temperature has to be high enough to achieve a proper crystallinity. On the other hand, a lower deposition temperature leads to less chemical reaction and interdiffusion. Post-annealing approaches in order to circumvent this dilemma will be presented, too. The deposited electrolyte thin films and half cells are analyzed with regard to structural and morphological properties, chemical composition and element distribution, and finally their electrochemical behavior. |