This title appears in the Scientific Report :
2020
Please use the identifier:
http://dx.doi.org/10.1039/D0GC01009J in citations.
Please use the identifier: http://hdl.handle.net/2128/25492 in citations.
Water-based fabrication of garnet-based solid electrolyte separators for solid-state lithium batteries
Water-based fabrication of garnet-based solid electrolyte separators for solid-state lithium batteries
Garnet-type Li7La3Zr2O12 (LLZ) is regarded as a promising oxide-based solid electrolyte (SE) for solid-state lithium batteries (SSLBs) or other advanced Li-battery concepts like Li–air or Li–S batteries. A thin free-standing LLZ sheet can be fabricated by tape-casting and used e.g. as separators in...
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Personal Name(s): | Ye, Ruijie |
---|---|
Tsai, Chih-Long / Ihrig, Martin / Sevinc, Serkan / Rosen, Melanie / Dashjav, Enkhtsetseg / Sohn, Yoo Jung / Figgemeier, Egbert (Corresponding author) / Finsterbusch, Martin (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Green chemistry, 22 (2020) 15, S. 4952-4961 |
Imprint: |
Cambridge
RSC
2020
|
DOI: |
10.1039/D0GC01009J |
Document Type: |
Journal Article |
Research Program: |
Electrochemical Storage |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/25492 in citations.
Garnet-type Li7La3Zr2O12 (LLZ) is regarded as a promising oxide-based solid electrolyte (SE) for solid-state lithium batteries (SSLBs) or other advanced Li-battery concepts like Li–air or Li–S batteries. A thin free-standing LLZ sheet can be fabricated by tape-casting and used e.g. as separators in SSLBs, since tape casting is an industrially established process and enables large-scale production of such SEs. However, organic solvents and additives employed in conventional slurry recipes for tape-casting give rise to health and safety concerns and also cause a high cost for solvent recovery. Hence, development of a green, water-based processing route can reduce both manufacturing costs and environmental footprint. In this work, we developed a tape-casting process for LLZ SEs using water as solvent, the water-soluble biopolymer methylcellulose as binder and other eco-friendly polymers as plasticizers. Although a Li+/H+ exchange takes place during our procedure, we demonstrate that the Li+/H+ exchange reaction is reversible in our procedure and results in the formation of stoichiometric cubic LLZ at the end. The obtained free-standing LLZ sheets with thickness of 150 μm and relative density of approx. 90% offer an ionic conductivity of 0.15 mS cm−1 at room temperature. We thereby prove that it is feasible to use water as dispersion medium and eco-friendly polymer additives for the fabrication of thin garnet-based SE layers. |