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Synthesis and sintering of Li1.3Al0.3Ti1.7(PO4)3 (LATP) electrolyte for ceramics with improved Li+ conductivity

: Wätzig, Katja; Rost, Axel; Heubner, Christian; Coeler, Matthias; Nikolowski, Kristian; Wolter, Mareike; Schilm, Jochen

Fulltext ()

Journal of alloys and compounds 818 (2020), Art. 153237, 7 pp.
ISSN: 0925-8388
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
03XP0114I; Artemys
Journal Article, Electronic Publication
Fraunhofer IKTS ()
all-solid-state batteries; sol-gel synthesis; separator; high ionic conductivity; LATP; lithium aluminum titanium phosphate; solid electrolyte

The key material for all-solid-state batteries is the solid electrolyte. In concepts with high energy density and capacity, this Li+ conductive component has two essential functions: Substituting the liquid electrolyte in the cathode and separating the cathode from the anode. Therefore, the research on Li+ conductive solids is one important step to realize high performing all-solid-state batteries. In this study, two different methods of preparing Li1.3Al0.3Ti1.7(PO4)3 (LATP) powder are compared with regard to particle size, phase purity and sintering properties. As top-down method the melting and as bottom-up route the sol-gel synthesis are applied. Spark Plasma Sintering (SPS) is used to densify the powders at temperatures between 800 and 1000 °C. The densities, the microstructures and the Li+ conductivities are compared in relation to the preparation method. Using sol-gel synthesis, the phase purity of the LATP powder is higher compared to the top-down route. The milling of the synthesized powder increases the homogeneity of the resulting microstructure and enhances the ionic conductivity. Room temperature Li+ conductivity of 1 × 10−3 S cm-1 with a high density of 99.4% was achieved with the milled, sol-gel synthesized powder at a sintering temperature of 1000 °C.