| NASICON ceramic electrolytes produced by combination of tape-casting and hot-pressing with high performances at room temperature. Towards sustainable all-solid-state sodium batteries. Alejandro Varez1; Belén Levenfeld2; Cynthia Martinez Cisneros1; Johanna M Naranjo Balseca1; Bidhan Pandit1; 1UNIVERSIDAD CARLOS III DE MADRID, LEGANES, Spain; 2UNIVERSIDAD CARLOS III DE MADRID, Leganés, Spain; PAPER: 443/SolidStateChemistry/Regular (Oral) SCHEDULED: 12:20/Mon. 28 Nov. 2022/Andaman 1 ABSTRACT: The abundance of sodium and the physical-chemical similarities with lithium make sodium batteries a technology to the Lithium ones, with the potential to produce disruptive changes in the transition towards cleaner and sustainable energy sources less dependent on fossil fuels. In this experimental work, we propose a new processing methodology, based on the combination of tape-casting and hot-pressing, to develop high performances ceramic NASICON electrolytes with formula Na3.16Zr1.84Y0.16Si2PO12 and high ionic conductivity (from 0.12 mS/cm at 20ºC to 1.29 mS/cm at 100ºC), wide electrochemical window (from 1.5V to 4V), good mechanical properties and (325 HV of hardness) and high thermal stability. In order to study the compatibility of the chemical and electrochemical characteristics the electrolytes with the solid-state battery approach, half-cells (Na0/NASICON/FePO4) were prepared and tested at room temperature. Preliminary results reveal that capacity slightly increases as the number of cycle does, reporting values of up to 85 mAh/g (at a C-rate of C/20), about 50% of the theoretical capacity and 60% of the capacity typically reported for their liquid-based counterparts. Due to these results were obtained for room temperature, the application scope of the proposed electrolytes broadens not only to stationary applications but to transport, where highly efficient and sustainable devices are highly demanded. Therefore, the all-solid-state sodium battery based on Na0/NASICON/FePO4 here proposed demonstrates to be functional and a potential competitor for current all-solid-state batteries based on the electrochemistry of lithium. |
