Powder aerosol deposited Na3V2(PO4)3/C composite cathode films for next generation of energy storage systems

Titelangaben

Sozak, Mutlucan ; Knies, Sofie ; Kita, Jaroslaw ; Bianchini, Matteo ; Moos, Ralf:
Powder aerosol deposited Na3V2(PO4)3/C composite cathode films for next generation of energy storage systems.
2024
Veranstaltung: 14th International Conference on Ceramic Materials and Components for Energy and Environmental Systems , 18-22 August 2024 , Budapest, Hungary.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )

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Abstract

The increasing demand for lithium and the local distribution of its sources on the Earth crustled to drastically increased prices of its resources. Therefore, researchers worldwide are insearch of low-cost alternatives to state-of-the-art Li-ion battery architectures. Sodium batteries with sodium vanadium phosphate (NVP) electrodes have gained attention as a promising solution due to affordability, structural stability, high ionic conductivity, and theoreticalenergy density. Dense films of functional materials on a wide variety of substrates can be fabricated directly at room temperature by the so-called powder aerosol deposition (PAD) method. Therefore, this unique spray coating method enables the deposition of composite cathode active materials on current collectors ensuring a tight contact in a relatively short processing time. In the current work, we synthesized NVP/C composited cathode powders using the mixed oxide technique. The calcined powders were characterized by X-ray diffraction analyses including Rietveld refinement. The carbon content of the synthesized powder was determined by thermo gravimetric analysis (TGA). The powders with the desired phase were sprayed on aluminum substrates via PAD to serves as cathodes. In addition, for comparison, a part of the powder was used for producing tape-casted cathodes. Coin cells of both cathodes were assembled (using 1M NaPF6 inEC:EMC 30:70 wt.% as an electrolyte, Whatman GF/B as a separator, and Na metal as the anode) and their cycling performances were compared. The effect of annealing on the capacity of PAD-produced cathode films was also investigated. Our results demonstrate the successful deposition of composite cathode active materials on aluminum substrates and provide a comparative study to conventional tape casting. This work may pave the way for an easier production of low-cost and high performance electrodes for post-lithium batteries.