Enormous conductivity, scalable manufacturing process and reliable charging. With optimized production, readily available raw materials and solid electrolyte, solid sodium batteries could soon be practically usable - with record-breaking ion conductivity.https://www.notebookcheck.net/Safe-cheap-fast-charging-Na-S-solid-state-battery-becomes-tangible.830991.0.html
All the parameters are super exciting except for the lifespan. 75% after 300 cycles is unusable as Lion can achieve results that are 10x better. Longevity still seems like a major hurdle to overcome.