Would love to hear from domain experts here. Reading the article one finds that they only created very small cathodes rather than anything close to a 'consumer sized' battery.
I'm not a battery expert, but I have looked into Na-S before. While it's a great rhetorical bludgeon in arguments about what batteries can do in theory — we'll never run out of sodium or sulfur — actual costs of Na-S installations are consistently much higher than lithium or other battery types. For example, this review cites a present system cost of over $400/kWh:
A new scientific development can be cool, but it won't directly reduce costs, since it's not actually an industrial process. A lower operating temperature might simplify construction. But all that remains to be seen.
EDIT: if you read the original paper in TFA you will find that molybdenum, an extremely rare metal, is key to the cathode, though only at 1.2% by weight. Interpretation unclear.
https://www.mdpi.com/1996-1073/13/13/3307
A new scientific development can be cool, but it won't directly reduce costs, since it's not actually an industrial process. A lower operating temperature might simplify construction. But all that remains to be seen.
EDIT: if you read the original paper in TFA you will find that molybdenum, an extremely rare metal, is key to the cathode, though only at 1.2% by weight. Interpretation unclear.