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Sodium is a promising candidate for stationary storage applications, especially when the demand for lithium-ion batteries increases due to electromobility applications. Even though its energy density is lower, Na-ion technology is estimated to lead to a cost reduction of 30% compared to Li-ion technology. To improve safety as well as energy density, Na-based all-solid-state-batteries featuring solid electrolytes such as beta-alumina and sodium superionic conductors and cathode materials such as Na 3 V 2 (PO4) 3  and Na x CoO 2  have been developed over the past years. However, the biggest challenge are mixed cathodes with highly conductive interfaces, especially when co-sintering the materials. For example, a promising sodium superionic conductor type Na 3 Zr 2 Si 2 PO 12  electrolyte sinters at 1,250°C, whereas the corresponding Na 3 V 2 PO 12  cathode decomposes at temperatures higher than 900°C, posing a bottleneck. Thus in this paper, we synthesized Na 0.62  [Ni 0.10 Fe 0.10 Mn 0.80 ]O 2  as cathode material for all-solid-state sodium-ion batteries  via  a relatively cheap and easy solution-assisted solid state reaction processing route. The thermal investigations of the pure cathode material found no degradation up to 1,260°C, making it a perfect match for Na 3.4 Zr 2 Si 2.4 P 0.6 O 12  electrolyte. In our aim to produce a co-sintered mixed cathode, electron microscopy investigation showed a highly dense microstructure and the elemental mapping performed  via  energy dispersive X-ray spectroscopy and secondary ion mass spectrometry confirm that Na 3.4 Zr 2 Si 2.4 P 0.6 O 12  and Na 0.62  [Ni 0.10 Fe 0.10 Mn 0.80 ]O 2  do not react during sintering. However, the active cathode material forms a sodium rich and a sodium deficient phase which needs further investigation to understand the origin and its impact on the electrochemical performance.

Co-Sintering Study of Na0.67[Ni0.1Fe0.1Mn0.8]O2 and NaSICON Electrolyte–Paving the way to High Energy Density All-Solid-State Batteries