%0 Journal Article
%A Ye, Ruijie
%A Tsai, Chih-Long
%A Ihrig, Martin
%A Sevinc, Serkan
%A Rosen, Melanie
%A Dashjav, Enkhtsetseg
%A Sohn, Yoo Jung
%A Figgemeier, Egbert
%A Finsterbusch, Martin
%T Water-based fabrication of garnet-based solid electrolyte separators for solid-state lithium batteries
%J Green chemistry
%V 22
%N 15
%@ 1463-9262
%C Cambridge
%I RSC
%M FZJ-2020-02353
%P 4952-4961
%D 2020
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000555342200011
%R 10.1039/D0GC01009J
%U https://juser.fz-juelich.de/record/877638