TY  - JOUR
AU  - Ye, Ruijie
AU  - Tsai, Chih-Long
AU  - Ihrig, Martin
AU  - Sevinc, Serkan
AU  - Rosen, Melanie
AU  - Dashjav, Enkhtsetseg
AU  - Sohn, Yoo Jung
AU  - Figgemeier, Egbert
AU  - Finsterbusch, Martin
TI  - Water-based fabrication of garnet-based solid electrolyte separators for solid-state lithium batteries
JO  - Green chemistry
VL  - 22
IS  - 15
SN  - 1463-9262
CY  - Cambridge
PB  - RSC
M1  - FZJ-2020-02353
SP  - 4952-4961
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000555342200011
DO  - DOI:10.1039/D0GC01009J
UR  - https://juser.fz-juelich.de/record/877638
ER  -