Journal Article

FZJ-2020-02353

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Water-based fabrication of garnet-based solid electrolyte separators for solid-state lithium batteries

Ye, R.FZJ* ; Tsai, C.-L.FZJ* ; Ihrig, M.FZJ* ; Sevinc, S.FZJ* ; Rosen, M.FZJ* ; Dashjav, E.FZJ* ; Sohn, Y. J.FZJ* ; Figgemeier, E. (Corresponding author)FZJ* ; Finsterbusch, M. (Corresponding author)FZJ*

2020
RSC Cambridge

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/25492  doi:10.1039/D0GC01009J

Abstract: 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.

---

Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)
2. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)

Appears in the scientific report 2020

---

Database coverage:
; ; ; Allianz-Lizenz / DFG ; Chemical Reactions ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

---