Paolella, AndreaAndreaPaolellaZhu, WenWenZhuBertoni, GiovanniGiovanniBertoniPerea, AlexisAlexisPereaDemers, HendrixHendrixDemersSavoie, SylvioSylvioSavoieGirard, GabrielGabrielGirardDelaporte, NicolasNicolasDelaporteGuerfi, AbdelbastAbdelbastGuerfiRumpel, MathiasMathiasRumpelLorrmann, HenningHenningLorrmannDemopoulos, George P.George P.DemopoulosZaghib, KarimKarimZaghib2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26314110.1002/admi.202000164This 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.enceramicshot-pressinginterfaceslithiumsolid-batteries666530620journal article