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Toward an All-Ceramic Cathode–Electrolyte Interface with Low-Temperature Pressed NASICON Li1.5Al0.5Ge1.5(PO4)3 Electrolyte

: Paolella, Andrea; Zhu, Wen; Bertoni, Giovanni; Perea, Alexis; Demers, Hendrix; Savoie, Sylvio; Girard, Gabriel; Delaporte, Nicolas; Guerfi, Abdelbast; Rumpel, Mathias; Lorrmann, Henning; Demopoulos, George P.; Zaghib, Karim


Advanced materials interfaces 7 (2020), No.12, Art. 2000164, 8 pp.
ISSN: 2196-7350
Journal Article
Fraunhofer ISC ()
ceramics; hot-pressing; interfaces; lithium; solid-batteries

This work shows, for the first time, the critical influence of pressure during the hot sintering stage on the ionic conductivity of the lithium super ionic conductor Li1.5Al0.5Ge1.5(PO4)3. A hot press method is developed to obtain high ionic conductivities at the significantly decreased densification temperature of only 650 °C by applying pressure (56 MPa). Considering the possible initiation of undesirable decomposition reactions when cathode materials are annealed at high temperature (typically ≥700 °C), the use of high pressure at 650 °C can significantly limit the formation of degradation by-products. This study determines the criteria required to optimize the pressure and temperature parameters for enhancing the total ionic conductivity. Finally, this study reports an all solid-state battery based on a LiFePO4 olivine cathode prepared at 650 °C showing very good Li-intercalation/deintercalation performance. Good ionic interfacial contact is achieved without using polymer and liquid electrolyte.