This title appears in the Scientific Report : 2020 

Microstructure, ionic conductivity and mechanical properties of tape-cast Li1.5Al0.5Ti1.5P3O12 electrolyte sheets
Dashjav, Enkhtsetseg (Corresponding author)
Gellert, Michael / Yan, Gang / Grüner, Daniel / Kaiser, Nico / Spannenberger, Stefan / Kraleva, Irina / Bermejo, Raul / Gerhards, Marie-Theres / Ma, Qianli / Malzbender, Jürgen / Roling, Bernhard / Tietz, Frank / Guillon, Olivier
Werkstoffstruktur und -eigenschaften; IEK-2
Werkstoffsynthese und Herstellungsverfahren; IEK-1
Journal of the European Ceramic Society, 40 (2020) 5, S. 1975 - 1982
Amsterdam [u.a.] Elsevier Science 2020
Journal Article
Electrochemical Storage
Published on 2020-01-15. Available in OpenAccess from 2022-01-15.
Published on 2020-01-15. Available in OpenAccess from 2022-01-15.
Please use the identifier: in citations.
Please use the identifier: in citations.
Free-standing Li1.5Al0.5Ti1.5P3O12 electrolyte sheets with a thickness of 50–150 µm were prepared by tape casting followed by sintering at 850–1000 °C in air. While a sintering temperature of 850 °C was too low to achieve appreciable densification and grain growth, a peak relative density of 95 % was obtained at 920 °C. At higher sintering temperatures, the microstructure changed from a bimodal grain size distribution towards exclusively large grains (> 10 µm), accompanied by a decrease in relative density (down to 86 % at 1000 °C). In contrast, ionic conductivity increased with increasing sintering temperature, from 0.1 mS/cm at 920 °C to 0.3 mS/cm at 1000 °C. Sintering behavior was improved by adding 1.5 % of amorphous silica to the slurry. In this way, almost full densification (99.8 %) and an ionic conductivity of 0.2 mS/cm was achieved at 920 °C. Mechanical characterization was carried out on the almost fully densified material, yielding elastic modulus and hardness values of 109 and 8.7 GPa, respectively. The fracture strength and Weibull modulus were also characterized. The results confirm that densification and reduction of grain size improve the mechanical properties.