Crosslinked polymer in NASICON porous ceramics: Novel hybrid electrolytes for sodium solid-state batteries

All-solid-state sodium batteries emerge as an excellent alternative to the conventional Li-ion ones towards more reliable, sustainable and safer large-scale energy storage systems able to overcome the current challenges related to climate change and decarbonization. In this study, we present novel sodium hybrid solid electrolytes based on a sintered porous NASICON structure infiltrated with a polymer electrolyte that crosslinks, via radical polymerization, inside the porous microstructure. The porous ceramic material (Na3.16Zr1.84Y0.16Si2PO12) is obtained by combining tape-casting with low-temperature hot pressing, whereas the polymer electrolyte is based in a polycondensate polymer and two different sodium salts (NaClO4 and NaPF6). The hybrid electrolytes are characterized in terms of microstructure, thermal stability and electrochemical behavior. The galvanostatic cycling was performed at 80 degrees C for both approaches, using a coin cell with configuration Na¿Hybrid electrolyte¿FePO4, obtaining a higher discharge capacity of 160.7 mAh g¿1 (C/20) with the hybrid electrolyte based on the NaPF6 salt, which corresponds to 90 % of the theoretical capacity value of FePO4, value higher than that obtained using a dense ceramic electrolyte (Na3.16Zr1.84Y0.16Si2PO12), demonstrating the synergistic effect of both electrolytes (ceramic and polymer). The proposed rigid hybrid electrolytes pave the way for the development of safer electrolytes for all-solid-state batteries.

Crosslinked polymer in NASICON porous ceramics: Novel hybrid electrolytes for sodium solid-state batteries Articles