Thermal behaviour of Ta-doped LATP NASICON-type compounds

The lithium aluminium titanium tantalum phosphates compounds Li1+xAlxT2-x-yTay(PO4)3 (LATTaP) with different compositions (x = 0.3; 0.02 ≤ y ≤ 0.05) were synthesised using a solid-state synthesis approach. The synthesised samples were characterised through various methods. TGA/DTG results indicate the thermal stability and complete breakdown of the stoichiometric compositions. This ensures LATTaP solid electrolytes remain stable under battery cycling, high-temperature environments, and battery applications. This was corroborated by the FTIR findings, which showed the total decomposition of volatile substances, including water molecules, CO2, and HN3; the wave bands associated with hydroxyl or carboxylic compounds were completely absent, with only the bands corresponding to the vibration of the PO4 ionic group detected. This identifies chemical bonding, confirming the stability of the phosphate framework which determines structural integrity for long-term battery cycling without material degradation. The samples were successfully produced with an R-3c space group for structural characterisation, assuming a hexagonal crystal structure, as referenced in the ICSD database 98-006-9677. XRD analysis demonstrated the presence of a singlephase NASICON-type crystal structure, which is essential for high ionic conductivity. The findings showed that the thermal properties of the materials are important to identify the proper applicability of the material as a solid electrolyte.

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