The Wikipedia article mentions two types, molten and room temperature, each with their own pros and cons. https://en.wikipedia.org/wiki/Sodium%E2%80%93sulfur_b

The Wikipedia article mentions two types, molten and room temperature, each with their own pros and cons. https://en.wikipedia.org/wiki/Sodium%E2%80%93sulfur_battery https://en.wikipedia.org/wiki/Sodium%E2%80%93sulfur_battery The paper mentions making the battery at 300c (oven temperature) but the text talks about "room temperature" or "RT": https://onlinelibrary.wiley.com/doi/10.1002/adma.202206828 https://onlinelibrary.wiley.com/doi/10.1002/adma.202206828 "...thermally treated at 300 °C for 12 h. The Mo mass loading of S@MoS2-Mo1/SGF was ≈1.2 wt.%, measured by ICP-OES. The synthesis procedure of S@MoS2/SGF was the same as S@MoS2-Mo1/SGF but the thermal treatment was extended to 24 h. To prepare the S@SGF, pure SGF was used to replace Mo1/SGF. S@Mo1/SGF was prepared by pyrolyzing the mixture of Mo1/SGF and S at 155 °C for 12 h." The only mentions of higher temperatures are for thermogravimetric analysis where they heat it to 800c and measure the amount of S as it varies with temperature.