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Reduced sintering temperatures of Li+ conductive Li1.3Al0.3Ti1.7(PO4)3 ceramics

: Wätzig, Katja; Heubner, Christian; Kusnezoff, Mihails

Volltext ()

Crystals 10 (2020), Nr.5, Art. 408, 11 S.
ISSN: 2073-4352
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
Energie- und Klimafonds; 03XP0173D
FestBatt Oxide
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IKTS ()
Li ion conductive ceramic; solid electrolyte; Li-ion batteries; all-solid-state batteries; LATP

All-solid-state batteries (ASSB) are considered promising candidates for future energy storage and advanced electric mobility. When compared to conventional Li-ion batteries, the substitution of Li-ion conductive, flammable liquids by a solid electrolyte and the application of Li-metal anodes substantially increase safety and energy density. The solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP) provides high Li ion conductivity of about 10-3 S/cm and is considered as a highly promising candidate for both, the solid electrolyte-separator and the ionically conductive part of the all-solid state composite cathode, consisting of the cathode material, the solid electrolyte and an electron conductor. Co-sintering of the composite cathode is a sophisticated challenge, because temperatures above 1000 °C are typically required to achieve the maximum ionic conductivity of LATP but provoke reactions with the cathode material, inhibiting proper electrochemical functioning in the ASSB. In the present study, the application of sintering aids with different melting points and their impact on the sinterability and the conductivity of LATP is investigated by means of optical dilatometry and impedance spectroscopy. The microstructure of the samples is analyzed by SEM. The results indicate that the sintering temperature can be reduced below 800 °C while maintaining high ionic conductivity of up to 3.6 x 10-4 S/cm. These insights can be considered a crucial step forward to enable LATP based composite cathodes for future ASSB.